SRv6 7.3.1 features
SRv6 uSID Configuration
Author:Jakub Horn
This document describes simple SRv6 uSID configuration in IOS XR 7.3.1. It covers SRv6 uSID itself, L3VPN for IPv4 and IPv6, TI-LFA and microloop avoidance and Flexible Algorithm. This document is collateral to the 7.3.1 feature introduction: Video.
Introduction
Simple network with 5 routers. Platforms are NCS540 and NCS5501. But configurations are same across IOS XR portfolio.
Configurations on all routers are very identical. The only exception is BGP where we made router 1 route reflector. Here we will provide configuration templates and at the end of the document you can find full device configurations for each router. Wherever we use uppercase X in the configuration it means router id so 1 for router 1, 2 for router 2, etc. For SRv6 on the NCS platform we need to enable HW profile. After enabling the HW profile router needs to be reloaded.
hw-module profile segment-routing srv6 mode micro-segment format f3216
Basic SRv6 Configuration
Interfaces:
interface TenGigE0/0/0/0
ipv6 enable
no shut
interface TenGigE0/0/0/1
ipv6 enable
no shut
SRv6 locator:
segment-routing
srv6
locators
locator MAIN
micro-segment behavior unode psp-usd
prefix fcbb:bb00:X::/48
here we used X for template, which means config for router 1 is
prefix fcbb:bb00:1::/48
for router 2
prefix fcbb:bb00:1::/48
etc
ISIS Configuration
router isis 1
is-type level-1
net 49.0.0.X.00
address-family ipv6 unicast
metric-style wide
segment-routing srv6
locator MAIN
interface TenGigE0/0/0/0
point-to-point
address-family ipv6 unicast
interface TenGigE0/0/0/1
point-to-point
address-family ipv6 unicast
L3VPN and BGP Configuration
VRF Configuration
vrf 1
address-family ipv4 unicast
import route-target
1:1
export route-target
1:1
interface Loopback101
vrf 1
ipv4 address 1.1.1.X 255.255.255.255
BGP Configuration R1:
int lo0
ipv6 addr fcbb:bb00:1::1/128
router bgp 1
bgp router-id 1.0.0.1
address-family vpnv4 unicast
address-family vpnv6 unicast
neighbor-group RRC
remote-as 1
update-source Loopback0
address-family vpnv4 unicast
route-reflector-client
address-family vpnv6 unicast
route-reflector-client
neighbor fcbb:bb00:2::1
use neighbor-group RRC
neighbor fcbb:bb00:3::1
use neighbor-group RRC
neighbor fcbb:bb00:4::1
use neighbor-group RRC
neighbor fcbb:bb00:5::1
use neighbor-group RRC
vrf 1
rd 1:1
address-family ipv4 unicast
segment-routing srv6
locator MAIN
alloc mode per-vrf
redistribute connected
BGP Configuration R2-R5:
int lo0
ipv6 addr fcbb:bb00:X::1/128
router bgp 1
bgp router-id 1.0.0.X
address-family vpnv4 unicast
address-family vpnv6 unicast
neighbor fcbb:bb00:1::1
remote-as 1
update-source Loopback0
address-family vpnv4 unicast
address-family vpnv6 unicast
vrf 1
rd 1:1
address-family ipv4 unicast
segment-routing srv6
locator MAIN
alloc mode per-vrf
redistribute connected
TI-LFA and microloop avoidance
isis 1
address-family ipv6 unicast
microloop avoidance segment-routing
interface TenGigE0/0/0/0
address-family ipv6 unicast
fast-reroute per-prefix
fast-reroute per-prefix ti-lfa
interface TenGigE0/0/0/1
address-family ipv6 unicast
fast-reroute per-prefix
fast-reroute per-prefix ti-lfa
Performance Measurement
performance-measurement
interface TenGigE0/0/0/0
delay-measurement
interface TenGigE0/0/0/1
delay-measurement
Flexible Algorithm
Locator:
segment-routing
srv6
locators
locator LATENCY
micro-segment behavior unode psp-usd
prefix fcbb:bb01:X::/48
algorithm 128
ISIS:
router isis 1
flex-algo 128
metric-type delay
advertise-definition
address-family ipv6 unicast
segment-routing srv6
locator LATENCY
VRF:
vrf 2
address-family ipv6 unicast
import route-target
1:2
export route-target
1:2
interface Loopback102
vrf 2
ipv6 address 2001:7543::X/128
BGP:
router bgp 1
vrf 1
rd 1:1
address-family ipv4 unicast
segment-routing srv6
locator MAIN
alloc mode per-vrf
redistribute connected
