Connectivity Guide

Conguring BGP in a non-default VRF instance
To congure BGP in a non-default VRF instance.
1 Assign an AS number, and enter ROUTER-BGP mode from CONFIGURATION mode (1 to 65535 for 2-byte, 1 to 4294967295 for 4-
byte). Only one AS number is supported per system. If you enter a 4-byte AS number, 4-byte AS support is enabled automatically.
router bgp as-number
2 Enter ROUTER-BGP-VRF mode to congure BGP in a non-default VRF instance.
vrf vrf-name
3 Enter a neighbor in CONFIG-ROUTER-VRF mode.
neighbor ip-address
4 Add a remote AS in ROUTER-NEIGHBOR mode, from 1 to 65535 for 2-byte or 1 to 4294967295 for 4-byte.
remote-as as-number
5 Enable the BGP neighbor in ROUTER-NEIGHBOR mode.
no shutdown
6 (Optional) Add a description text for the neighbor in ROUTER-NEIGHBOR mode.
description text
To reset the conguration when you change the conguration of a BGP neighbor, use the clear ip bgp * command. To view the BGP
status, use the
show ip bgp summary command.
Congure BGP
OS10# configure terminal
OS10(config)# router bgp 100
OS10(config-router-bgp-100)# vrf blue
OS10(config-router-vrf)# neighbor 5.1.1.1
OS10(config-router-neighbor)# remote-as 1
OS10(config-router-neighbor)# description n1_abcd
OS10(config-router-neighbor)# exit
OS10(config-router-vrf)# template t1
OS10(config-router-template)# description peer_template_1_abcd
Congure Dual Stack
OS10 supports dual stack for BGPv4 and BGPv6. Dual stack BGP allows simultaneous exchange of same IPv4 or IPv6 prexes through
dierent IPv4 and IPv6 peers. You can enable dual stack using the activate command in the corresponding address-family mode. By
default,
activate command is enabled for the IPv4 address family for all the neighbors.
If a BGP-v4 neighbor wants to carry ipv6 prex information, it activates the IPv6 address-family. For a BGP-v6 neighbor to carry ipv4
prex, it activates the IPv4 address-family.
1 Enable support for the IPv6 unicast family in CONFIG-ROUTER-BGP mode.
address family ipv6 unicast
2 Enable IPv6 unicast support on a BGP neighbor/template in CONFIG-ROUTER-BGP-AF mode.
activate
Congure administrative distance
Routers use administrative distance to determine the best path between two or more routes to reach the same destination. Administrative
distance indicates the reliability of the route; the lower the administrative distance, the more reliable the route. If the routing table manager
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Layer 3