Setup Guide

Figure 26. Congure IPv6 NH to advertise IPv6 prex over IPv4 neighbor
To enable BGP to pick the next hop IPv6 address automatically for IPv6 prex advertised over an IPv4 neighbor, use the following
commands.
• Enable the system to pick the next hop IPv6 address dynamically for IPv6 prex advertised over an IPv4 neighbor.
ROUTER-BGP mode mode
neighbor {ip–address | peer-group-name} auto-local-address
Enter either the neighbor IP address or the name of the peer group.
NOTE: If outbound policy is applied along with auto-local-address enabled, then policy takes precedence.
Example conguration of BGP to automatically pick IPv6 address automatically for IPv6 prex advertised over an IPv4 neighbor
The following example conguration demonstrates how to congure BGP to automatically pick IPv6 address for IPv6 prex advertised over
an IPv4 neighbor.
Example conguration 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
Conguring 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 congured under IPv6 address family. If the auto-local-address is not congured, the IPv4 mapped
IPv6 address (10.1.1.1) as a next hop.
Following is the show running-config command output for the above conguration.
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 conguration performed in R2
DellEMC# configure terminal
DellEMC(conf)# router bgp 20
Border Gateway Protocol (BGP)
247