JoLeKing

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====== SRv6 L3VPN Topology & Configuration (Cleaned & Documented) ======

===== 1. Summary =====
This document details the configuration of a multi-tenant **SRv6 L3VPN** environment deployed using Containerlab and FRRouting (FRR). The network provides fully isolated, segmented Layer 3 Virtual Private Network (L3VPN) connectivity for two separate tenants: **Client RED** and **Client BLUE**.

==== 1.1 Architecture & Design Highlights ====
  * **Underlay Routing**: IS-IS serves as the Interior Gateway Protocol (IGP) with Segment Routing over IPv6 (SRv6) extensions enabled.
  * **Overlay Routing**: Multiprotocol iBGP (MP-BGP) exchanges **VPNv4** and **VPNv6** routes. Global IPv4/IPv6 unicast address families are disabled globally to ensure a clean, dedicated VPN-only overlay.
  * **Route Reflectors**: Dual redundant Route Reflectors (RR1 and RR2) distribute overlay routing cleanly across the network, avoiding a complex full-mesh configuration between PEs.
  * **Network Isolation**: Dedicated tenant routing is isolated using Linux VRF tables (RED and BLUE) bound to the physical interfaces.
  * **Data-Plane MTU Engineering**: The Core transit MTU is explicitly engineered to **1578 bytes** to accommodate the heavy overhead of SRv6 headers (IPv6 header + Segment Routing Header + 128-bit VPN SIDs) so that standard client frames (1500-byte MTU) bypass core fragmentation or dropping.

----

===== 2. Containerlab Topology (clab topo) =====
The topology features 4 Provider Edge (PE) routers, 6 Provider Core (P) routers, 2 Route Reflectors (RRs), and Alpine client containers for testing.

<code>
name: srv6-l3vpn
mgmt:
  network: clab-mgmt-net
  ipv4-subnet: 172.99.20.0/24
  ipv6-subnet: ""
topology:
  nodes:
    rr1:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - rr1/daemons:/etc/frr/daemons
        - rr1/frr.conf:/etc/frr/frr.conf
        - rr1/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    rr2:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - rr2/daemons:/etc/frr/daemons
        - rr2/frr.conf:/etc/frr/frr.conf
        - rr2/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    p1:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p1/daemons:/etc/frr/daemons
        - p1/frr.conf:/etc/frr/frr.conf
        - p1/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
    p2:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p2/daemons:/etc/frr/daemons
        - p2/frr.conf:/etc/frr/frr.conf
        - p2/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth4.seg6_enabled=1
    p3:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p3/daemons:/etc/frr/daemons
        - p3/frr.conf:/etc/frr/frr.conf
        - p3/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
    p4:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p4/daemons:/etc/frr/daemons
        - p4/frr.conf:/etc/frr/frr.conf
        - p4/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
    p5:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p5/daemons:/etc/frr/daemons
        - p5/frr.conf:/etc/frr/frr.conf
        - p5/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth4.seg6_enabled=1
    p6:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - p6/daemons:/etc/frr/daemons
        - p6/frr.conf:/etc/frr/frr.conf
        - p6/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth3.seg6_enabled=1
        
    pe1:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - pe1/daemons:/etc/frr/daemons
        - pe1/frr.conf:/etc/frr/frr.conf
        - pe1/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - sleep 4
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - ip link add RED type vrf table 10
        - ip link add BLUE type vrf table 11
        - ip link set eth2 master RED
        - ip link set eth3 master BLUE
        - ip link set RED up
        - ip link set BLUE up
        - sysctl -w net.ipv4.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    pe4:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - pe4/daemons:/etc/frr/daemons
        - pe4/frr.conf:/etc/frr/frr.conf
        - pe4/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - sleep 4
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - ip link add RED type vrf table 10
        - ip link add BLUE type vrf table 11
        - ip link set eth2 master RED
        - ip link set eth3 master BLUE
        - ip link set RED up
        - ip link set BLUE up
        - sysctl -w net.ipv4.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    pe3:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - pe3/daemons:/etc/frr/daemons
        - pe3/frr.conf:/etc/frr/frr.conf
        - pe3/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - sleep 4
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - ip link add RED type vrf table 10
        - ip link add BLUE type vrf table 11
        - ip link set eth2 master RED
        - ip link set eth3 master BLUE
        - ip link set RED up
        - ip link set BLUE up
        - sysctl -w net.ipv4.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    pe6:
      kind: linux
      image: quay.io/frrouting/frr:10.6.1
      cmd: bash -c "ip link add sr0 type dummy; ip link set sr0 up; /usr/lib/frr/frrinit.sh start && tail -f /dev/null"
      sysctls:
        net.ipv4.ip_forward: 1
        net.ipv4.conf.all.forwarding: 1
        net.ipv6.conf.all.forwarding: 1
        net.ipv6.conf.default.forwarding: 1
        net.ipv6.seg6_flowlabel: 1
        net.ipv6.conf.default.seg6_enabled: 1
        net.ipv6.conf.all.seg6_enabled: 1
        net.vrf.strict_mode: 1
        net.ipv6.conf.all.accept_source_route: 1
      binds:
        - pe6/daemons:/etc/frr/daemons
        - pe6/frr.conf:/etc/frr/frr.conf
        - pe6/vtysh.conf:/etc/frr/vtysh.conf
      exec:
        - sleep 4
        - ip link add dummy0 type dummy
        - ip link set dummy0 up
        - ip link add sr0 type dummy
        - ip link set sr0 up
        - ip link add RED type vrf table 10
        - ip link add BLUE type vrf table 11
        - ip link set eth2 master RED
        - ip link set eth3 master BLUE
        - ip link set RED up
        - ip link set BLUE up
        - sysctl -w net.ipv4.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.forwarding=1
        - sysctl -w net.ipv6.conf.sr0.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth1.seg6_enabled=1
        - sysctl -w net.ipv6.conf.eth2.seg6_enabled=1
    clientred-1:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.131.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.131.1
        - ip -6 address add fdd8:8b9e:07c5::2/64 dev eth1
        - ip -6 route add ::/0 via fdd8:8b9e:07c5::1
         
    clientred-3:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.133.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.133.1
        - ip -6 address add fdf2:f16f:a002::2/64 dev eth1
        - ip -6 route add ::/0 via fdf2:f16f:a002::1
    clientred-4:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.134.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.134.1
        - ip -6 address add fde4:1b4c:2ef0::2/64 dev eth1
        - ip -6 route add ::/0 via fde4:1b4c:2ef0::1
    clientred-6:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.136.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.136.1
        - ip -6 address add fdcb:a001:3440::2/64 dev eth1
        - ip -6 route add ::/0 via fdcb:a001:3440::1
    clientblue-1:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.231.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.231.1
        - ip -6 address add fdd9:8b9e:07c5::2/64 dev eth1
        - ip -6 route add ::/0 via fdd9:8b9e:07c5::1
         
    clientblue-3:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.233.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.233.1
        - ip -6 address add fdf9:f16f:a002::2/64 dev eth1
        - ip -6 route add ::/0 via fdf9:f16f:a002::1
    clientblue-4:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.234.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.234.1
        - ip -6 address add fde9:1b4c:2ef0::2/64 dev eth1
        - ip -6 route add ::/0 via fde9:1b4c:2ef0::1
    clientblue-6:
      kind: linux
      image: alpine:latest
      exec:
        - apk add iputils-ping
        - ip -4 addr add 192.168.236.2/24 dev eth1
        - ip link set dev eth1 up
        - ip -4 route del default
        - ip -4 route add 0.0.0.0/0 via 192.168.236.1
        - ip -6 address add fdc9:a001:3440::2/64 dev eth1
        - ip -6 route add ::/0 via fdc9:a001:3440::1

  links:
    - endpoints: ["p1:eth1", "p2:eth1"]
      mtu: 1578
    - endpoints: ["p1:eth2", "p4:eth2"]
      mtu: 1578
    - endpoints: ["p2:eth2", "p3:eth2"]
      mtu: 1578
    - endpoints: ["p2:eth3", "p5:eth3"]
      mtu: 1578
    - endpoints: ["p3:eth1", "p6:eth1"]
      mtu: 1578
    - endpoints: ["p6:eth2", "p5:eth2"]
      mtu: 1578
    - endpoints: ["p5:eth1", "p4:eth1"]
      mtu: 1578
    - endpoints: ["p1:eth3", "pe1:eth1"]
      mtu: 1578
    - endpoints: ["p4:eth3", "pe4:eth1"]
      mtu: 1578
    - endpoints: ["p3:eth3", "pe3:eth1"]
      mtu: 1578
    - endpoints: ["p6:eth3", "pe6:eth1"]
      mtu: 1578
    - endpoints: ["p2:eth4", "rr1:eth1"]
      mtu: 1578
    - endpoints: ["p5:eth4", "rr2:eth1"]
      mtu: 1578
    - endpoints: ["pe1:eth2", "clientred-1:eth1"]
      mtu: 1500
    - endpoints: ["pe3:eth2", "clientred-3:eth1"]
      mtu: 1500
    - endpoints: ["pe4:eth2", "clientred-4:eth1"]
      mtu: 1500
    - endpoints: ["pe6:eth2", "clientred-6:eth1"]
      mtu: 1500
    - endpoints: ["pe1:eth3", "clientblue-1:eth1"]
      mtu: 1500
    - endpoints: ["pe3:eth3", "clientblue-3:eth1"]
      mtu: 1500
    - endpoints: ["pe4:eth3", "clientblue-4:eth1"]
      mtu: 1500
    - endpoints: ["pe6:eth3", "clientblue-6:eth1"]
      mtu: 1500
</code>

----

===== 3. Provider Edge (PE) Configurations =====

==== 3.1 PE1 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname pe1
!
ip router-id 172.16.0.11
!
vrf RED
exit-vrf
!
vrf BLUE
exit-vrf
!
interface eth1
 description "to p1 - eth3"
 ipv6 address 2001:db8:1a::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to clientred-1 - eth1"
 ip address 192.168.131.1/24
 ipv6 address fdd8:8b9e:7c5::1/64
exit
!
interface eth3
 description "to clientblue-1 - eth1"
 ip address 192.168.231.1/24
 ipv6 address fdd9:8b9e:7c5::1/64
exit
!
interface lo
 ipv6 address 2001:db8:b::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 neighbor RR peer-group
 neighbor RR remote-as 65577
 neighbor RR bfd
 neighbor RR password cisco123
 neighbor RR update-source 2001:db8:b::1
 neighbor RR capability extended-nexthop
 neighbor 2001:db8:101::1 peer-group RR
 neighbor 2001:db8:102::1 peer-group RR
 !
 segment-routing srv6
  locator locator0
 exit
 !
 address-family ipv4 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
exit
!
router bgp 101 vrf RED
 bgp router-id 172.16.0.11
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.11:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.11:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
exit
!
router bgp 102 vrf BLUE
 bgp router-id 172.16.0.11
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.11:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.11:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0011.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  locators
   locator locator0
    prefix 2001:db8:b::/48
   exit
  exit
 exit
exit
!
bfd
 peer 2001:db8:101::1 multihop local-address 2001:db8:b::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:102::1 multihop local-address 2001:db8:b::1
  minimum-ttl 250
 exit
exit
!
</code>

==== 3.2 PE3 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname pe3
!
ip router-id 172.16.0.13
!
vrf RED
exit-vrf
!
vrf BLUE
exit-vrf
!
interface eth1
 description "to p3 - eth3"
 ipv6 address 2001:db8:3a::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to clientred-3 - eth1"
 ip address 192.168.133.1/24
 ipv6 address fdf2:f16f:a002::1/64
exit
!
interface eth3
 description "to clientblue-1 - eth1"
 ip address 192.168.233.3/24
 ipv6 address fdf9:f16f:a002::1/64
exit
!
interface lo
 ipv6 address 2001:db8:d::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 neighbor RR peer-group
 neighbor RR remote-as 65577
 neighbor RR bfd
 neighbor RR password cisco123
 neighbor RR update-source 2001:db8:d::1
 neighbor RR capability extended-nexthop
 neighbor 2001:db8:101::1 peer-group RR
 neighbor 2001:db8:102::1 peer-group RR
 !
 segment-routing srv6
  locator locator0
 exit
 !
 address-family ipv4 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
exit
!
router bgp 101 vrf RED
 bgp router-id 172.16.0.13
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.13:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.13:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
exit
!
router bgp 102 vrf BLUE
 bgp router-id 172.16.0.13
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.13:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.13:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0013.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  locators
   locator locator0
    prefix 2001:db8:d::/48
   exit
  exit
 exit
exit
!
bfd
 peer 2001:db8:101::1 multihop local-address 2001:db8:d::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:102::1 multihop local-address 2001:db8:d::1
  minimum-ttl 250
 exit
exit
!
</code>

==== 3.3 PE4 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname pe4
!
ip router-id 172.16.0.14
!
interface eth1
 description "to p4 - eth3"
 ipv6 address 2001:db8:4a::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
vrf RED
exit-vrf
!
vrf BLUE
exit-vrf
!
interface eth2
 description "to clientred-4 - eth1"
 ip address 192.168.134.1/24
 ipv6 address fde4:1b4c:2ef0::1/64
exit
!
interface eth3
 description "to clientblue-4 - eth1"
 ip address 192.168.234.1/24
 ipv6 address fde9:1b4c:2ef0::1/64
exit
!
interface lo
 ipv6 address 2001:db8:e::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 neighbor RR peer-group
 neighbor RR remote-as 65577
 neighbor RR bfd
 neighbor RR password cisco123
 neighbor RR update-source 2001:db8:e::1
 neighbor RR capability extended-nexthop
 neighbor 2001:db8:101::1 peer-group RR
 neighbor 2001:db8:102::1 peer-group RR
 !
 segment-routing srv6
  locator locator0
 exit
 !
 address-family ipv4 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
exit
!
router bgp 101 vrf RED
 bgp router-id 172.16.0.14
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.14:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.14:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
exit
!
router bgp 102 vrf BLUE
 bgp router-id 172.16.0.14
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.14:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.14:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0014.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  locators
   locator locator0
    prefix 2001:db8:e::/48
   exit
  exit
 exit
exit
!
bfd
 peer 2001:db8:101::1 multihop local-address 2001:db8:e::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:102::1 multihop local-address 2001:db8:e::1
  minimum-ttl 250
 exit
exit
!
</code>

==== 3.4 PE6 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname pe6
!
ip router-id 172.16.0.16
!
interface eth1
 description "to p6 - eth3"
 ipv6 address 2001:db8:6a::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
vrf RED
exit-vrf
!
vrf BLUE
exit-vrf
!
interface eth2
 description "to clientred-6 - eth1"
 ip address 192.168.136.1/24
 ipv6 address fdcb:a001:3440::1/64
exit
!
interface eth3
 description "to clientblue-6 - eth1"
 ip address 192.168.236.1/24
 ipv6 address fdc9:a001:3440::1/64
exit
!
interface lo
 ipv6 address 2001:db8:10::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 neighbor RR peer-group
 neighbor RR remote-as 65577
 neighbor RR bfd
 neighbor RR password cisco123
 neighbor RR update-source 2001:db8:10::1
 neighbor RR capability extended-nexthop
 neighbor 2001:db8:101::1 peer-group RR
 neighbor 2001:db8:102::1 peer-group RR
 !
 segment-routing srv6
  locator locator0
 exit
 !
 address-family ipv4 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor RR activate
  neighbor RR next-hop-self
  neighbor RR soft-reconfiguration inbound
 exit-address-family
exit
!
router bgp 101 vrf RED
 bgp router-id 172.16.0.16
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.16:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.16:65500
  rt vpn both 65000:101
  export vpn
  import vpn
 exit-address-family
exit
!
router bgp 102 vrf BLUE
 bgp router-id 172.16.0.16
 no bgp ebgp-requires-policy
 no bgp default ipv4-unicast
 no bgp network import-check
 sid vpn per-vrf export auto
 !
 address-family ipv4 unicast
  redistribute connected
  rd vpn export 172.16.0.16:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
 !
 address-family ipv6 unicast
  redistribute connected
  rd vpn export 172.16.0.16:65501
  rt vpn both 65000:102
  export vpn
  import vpn
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0016.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  locators
   locator locator0
    prefix 2001:db8:10::/48
   exit
  exit
 exit
exit
!
bfd
 peer 2001:db8:101::1 multihop local-address 2001:db8:10::1
 exit
 !
 peer 2001:db8:102::1 multihop local-address 2001:db8:10::1
 exit
exit
!
</code>

----

===== 4. Route Reflector (RR) Configurations =====

==== 4.1 RR1 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname rr1
!
interface eth1
 description "to p2 - eth4"
 ipv6 address 2001:db8:2101::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:101::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 bgp route-reflector allow-outbound-policy
 neighbor PE peer-group
 neighbor PE remote-as 65577
 neighbor PE bfd
 neighbor PE password cisco123
 neighbor PE update-source 2001:db8:101::1
 neighbor PE capability extended-nexthop
 neighbor 2001:db8:b::1 peer-group PE
 neighbor 2001:db8:b::1 description "PE1"
 neighbor 2001:db8:d::1 peer-group PE
 neighbor 2001:db8:d::1 description "PE3"
 neighbor 2001:db8:e::1 peer-group PE
 neighbor 2001:db8:e::1 description "PE4"
 neighbor 2001:db8:10::1 peer-group PE
 neighbor 2001:db8:10::1 description "PE6"
 neighbor 2001:db8:11::1 peer-group PE
 neighbor 2001:db8:11::1 description "GW1"
 neighbor 2001:db8:12::1 peer-group PE
 neighbor 2001:db8:12::1 description "GW2"
 !
 address-family ipv4 vpn
  neighbor PE activate
  neighbor PE route-reflector-client
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor PE activate
  neighbor PE route-reflector-client
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0101.00
 segment-routing srv6
  locator locator0
 exit
exit
!
bfd
 peer 2001:db8:b::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:d::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:e::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:10::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:11::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:12::1 multihop local-address 2001:db8:101::1
  minimum-ttl 250
 exit
exit
!
</code>

==== 4.2 RR2 ====
<code>
frr version 10.6.1_git
frr defaults traditional
hostname rr2
!
ip router-id 172.16.0.102
!
interface eth1
 description "to p5 - eth4"
 ipv6 address 2001:db8:5102::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:102::1/128
 ipv6 router isis SR
 isis passive
exit
!
router bgp 65577
 no bgp default ipv4-unicast
 bgp route-reflector allow-outbound-policy
 neighbor PE peer-group
 neighbor PE remote-as 65577
 neighbor PE bfd
 neighbor PE password cisco123
 neighbor PE update-source 2001:db8:102::1
 neighbor PE capability extended-nexthop
 neighbor 2001:db8:b::1 peer-group PE
 neighbor 2001:db8:b::1 description "PE1"
 neighbor 2001:db8:d::1 peer-group PE
 neighbor 2001:db8:d::1 description "PE3"
 neighbor 2001:db8:e::1 peer-group PE
 neighbor 2001:db8:e::1 description "PE4"
 neighbor 2001:db8:10::1 peer-group PE
 neighbor 2001:db8:10::1 description "PE6"
 neighbor 2001:db8:11::1 peer-group PE
 neighbor 2001:db8:11::1 description "GW1"
 neighbor 2001:db8:12::1 peer-group PE
 neighbor 2001:db8:12::1 description "GW2"
 !
 address-family ipv4 vpn
  neighbor PE activate
  neighbor PE route-reflector-client
 exit-address-family
 !
 address-family ipv6 vpn
  neighbor PE activate
  neighbor PE route-reflector-client
 exit-address-family
exit
!
router isis SR
 net 49.0000.0000.0000.0102.00
 segment-routing srv6
  locator locator0
 exit
exit
!
bfd
 peer 2001:db8:b::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:d::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:e::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:10::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:11::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
 !
 peer 2001:db8:12::1 multihop local-address 2001:db8:102::1
  minimum-ttl 250
 exit
exit
!
</code>

----

===== 5. Provider Core (P) Configurations =====

==== 5.1 P1 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p1
!
ip router-id 172.16.0.1
!
interface eth1
 description "to p2 - eth1"
 ipv6 address 2001:db8:12::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p4 - eth2"
 ipv6 address 2001:db8:14::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to pe1 - eth3"
 ipv6 address 2001:db8:1a::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth4
 description "to gw1 - eth1"
 ipv6 address 2001:db8:f11::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:1::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0001.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:1::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:1::/48
   exit
  exit
 exit
exit
!
</code>

==== 5.2 P2 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p2
!
ip router-id 172.16.0.2
!
interface eth1
 description "to p1 - eth1"
 ipv6 address 2001:db8:12::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p3 - eth2"
 ipv6 address 2001:db8:23::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to p5 - eth3"
 ipv6 address 2001:db8:25::2/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth4
 description "to rr1 - eth1"
 ipv6 address 2001:db8:2101::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:2::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0002.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:2::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:2::/48
   exit
  exit
 exit
exit
!
</code>

==== 5.3 P3 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p3
!
ip router-id 172.16.0.3
!
interface eth1
 description "to p6 - eth1"
 ipv6 address 2001:db8:36::3/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p2 - eth2"
 ipv6 address 2001:db8:23::3/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to pe3 - eth1"
 ipv6 address 2001:db8:3a::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:3::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0003.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:3::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:3::/48
   exit
  exit
 exit
exit
!
</code>

==== 5.4 P4 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p4
!
ip router-id 172.16.0.4
!
interface eth1
 description "to p5 - eth1"
 ipv6 address 2001:db8:45::4/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p1 - eth2"
 ipv6 address 2001:db8:12::4/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to pe4 - eth1"
 ipv6 address 2001:db8:4a::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:4::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0004.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:4::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:4::/48
   exit
  exit
 exit
exit
!
</code>

==== 5.5 P5 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p5
!
ip router-id 172.16.0.5
!
interface eth1
 description "to p4 - eth1"
 ipv6 address 2001:db8:45::5/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p6 - eth2"
 ipv6 address 2001:db8:56::5/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to p2 - eth3"
 ipv6 address 2001:db8:25::5/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth4
 description "to rr2 - eth1"
 ipv6 address 2001:db8:5102::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:5::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0005.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:5::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:5::/48
   exit
  exit
 exit
exit
!
</code>

==== 5.6 P6 ====
<code>
frr version 10.5.1_git
frr defaults traditional
hostname p6
!
ip router-id 172.16.0.6
!
interface eth1
 description "to p3 - eth1"
 ipv6 address 2001:db8:36::6/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth2
 description "to p5 - eth2"
 ipv6 address 2001:db8:56::6/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth3
 description "to pe6 - eth1"
 ipv6 address 2001:db8:6a::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface eth4
 description "to gw2 - eth1"
 ipv6 address 2001:db8:f62::1/64
 ipv6 router isis SR
 isis network point-to-point
exit
!
interface lo
 ipv6 address 2001:db8:6::1/128
 ipv6 router isis SR
 isis passive
exit
!
router isis SR
 net 49.0000.0000.0000.0006.00
 segment-routing srv6
  locator locator0
 exit
exit
!
segment-routing
 srv6
  static-sids
   sid 2001:db8:6::1/128 locator locator0 behavior uN
  exit
 exit
 srv6
  locators
   locator locator0
    prefix 2001:db8:6::/48
   exit
  exit
 exit
exit
!
</code>
"""