Concept Guide

The following example configuration demonstrates how to configure BGP to automatically pick IPv6 address for IPv6 prefix
advertised over an IPv4 neighbor.
Example configuration performed in R1
DellEMC# configure terminal
DellEMC(conf)# router bgp 655
DellEMC(conf-router_bgp)# neighbor 10.1.1.2 remote-as 20
DellEMC(conf-router_bgp)# neighbor 10.1.1.2 auto-local-address
DellEMC(conf-router_bgp)# neighbor 10.1.1.2 no shutdown
DellEMC(conf-router_bgp)# bgp router-id 1.1.1.1
DellEMC(conf-router_bgp)# address-family ipv6 unicast
DellEMC(conf-router_bgpv6_af)# neighbor 10.1.1.2 activate
DellECM(conf-router_bgpv6_af)# exit
Configuring the auto-local-address for a neighbor will dynamically pick the local BGP interface IPv6 address (2001::1/64) as
a the next hop for all the updates over IPv4 neighbor configured under IPv6 address family. If the auto-local-address is not
configured, the IPv4 mapped IPv6 address (10.1.1.1) as a next hop.
Following is the show running-config command output for the above configuration.
DellEMC# show running-config bgp
!
router bgp 655
bgp router-id 1.1.1.1
neighbor 10.1.1.2 remote-as 20
neighbor 10.1.1.2 auto-local-address
neighbor 10.1.1.2 no shutdown
!
address-family ipv6 unicast
neighbor 10.1.1.2 activate
exit-address-family
!
Example configuration performed in R2
DellEMC# configure terminal
DellEMC(conf)# router bgp 20
DellEMC(conf-router_bgp)# neighbor 10.1.1.1 remote-as 655
DellEMC(conf-router_bgp)# neighbor 10.1.1.1 no shutdown
DellEMC(conf-router_bgp)# address-family ipv6 unicast
DellEMC(conf-router_bgpv6_af)# neighbor 10.1.1.1 activate
DellECM(conf-router_bgpv6_af)# exit
Following is the show running-config command output for the above configuration.
DellEMC# show running-config bgp
!
router bgp 20
neighbor 10.1.1.1 remote-as 655
neighbor 10.1.1.1 no shutdown
!
address-family ipv6 unicast
neighbor 10.1.1.1 activate
exit-address-family
!
Following is the show ip bgp ipv6 unicast command output for the above configuration.
DellEMC# show ip bgp ipv6 unicast
BGP local RIB : Routes to be Added 0, Replaced 0, Withdrawn 0
BGP local router ID is 1.1.1.1
Status codes: s suppressed, S stale, d dampened, h history, * valid, > best
Path source: I - internal, a - aggregate, c - confed-external, r - redistributed
n - network, D - denied, S - stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 2001::/64 2001::1 0 0 655 ?
*> 3001::/64 3001::1 0 0 655 ?
224
Border Gateway Protocol (BGP)