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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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Route-refresh updates for IPv4 and IPv6 prefixes

This section explains the route-refresh functionality in different combinations for IPv4 or IPv6 prefix configured with IPv4 or IPv6 neighbors.

By default, the IPv4 prefixes is sent for all the neighbors irrespective of IPv4 address family is enabled or disabled. Following are the different scenarios during which the route-refresh message is sent for the corresponding neighbors:

By default, the route-refresh message for IPv4 prefixes is sent for both the IPv4 and IPv6 neighbors. Following is an example configuration in which IPv4 prefixes are enabled by default and the corresponding route-refresh message:
DellEMC(conf-router_bgp)# show config
!
router bgp 100
 redistribute connected 
 neighbor 20.1.1.2 remote-as 200 
 neighbor 20.1.1.2 no shutdown 
 neighbor 20::2 remote-as 200 
 neighbor 20::2 no shutdown 
 !
 address-family ipv6 unicast
  redistribute connected 
  exit-address-family
 !
DellEMC(conf-router_bgp)#do clear ip bgp 20.1.1.2 soft in
May  8 15:28:11 : BGP: 20.1.1.2 sending ROUTE_REFRESH AFI/SAFI (1/1) 
May  8 15:28:12 : BGP: 20.1.1.2 UPDATE rcvd packet len 56
May  8 15:28:12 : BGP: 20.1.1.2 rcvd UPDATE w/ attr: origin ?, path  200, nexthop 20.1.1.2, metric 0, 
<output truncated>
DellEMC(conf-router_bgp)#do clear ip bgp 20::2 soft in
May  8 15:28:04 : BGP: 20::2 sending ROUTE_REFRESH AFI/SAFI (1/1) 
May  8 15:28:04 : BGP: 20::2 UPDATE rcvd packet len 56
May  8 15:28:04 : BGP: 20::2 rcvd UPDATE w/ attr: origin ?, path  200, nexthop 20.1.1.2, metric 0, 
<output truncated>
In the below example, under the IPv6 address family configuration, only the IPv6 neighbor is enabled using neighbor ipv6–address activate command. If you execute, clear ip bgp neighbor-ipv4–address soft in command, only the IPv4 route-refresh update is sent. If you execute clear ip bgp neighbor-ipv6–address soft incommand, both the IPv4 and IPv6 route-refresh updates are sent. Following is an example configuration in which IPv6 prefixes is enabled for a IPv6 neighbor and the corresponding route-refresh message:
DellEMC(conf-router_bgp)# show config
!
router bgp 100
 redistribute connected 
 neighbor 20.1.1.2 remote-as 200 
 neighbor 20.1.1.2 no shutdown 
 neighbor 20::2 remote-as 200 
 neighbor 20::2 no shutdown 
 !
 address-family ipv6 unicast
  redistribute connected
  neighbor 20::2 activate
  exit-address-family
 !
DellEMC(conf-router_bgp)#do clear ip bgp 20.1.1.2 soft in
May  8 15:28:11 : BGP: 20.1.1.2 sending ROUTE_REFRESH AFI/SAFI (1/1) 
May  8 15:28:12 : BGP: 20.1.1.2 UPDATE rcvd packet len 56
May  8 15:28:12 : BGP: 20.1.1.2 rcvd UPDATE w/ attr: origin ?, path  200, nexthop 20.1.1.2, metric 0, 
<output truncated>
DellEMC(conf-router_bgp)#do clear ip bgp 20::2 soft in   
May  8 15:40:08 : BGP: 20::2 sending ROUTE_REFRESH AFI/SAFI (1/1) 
May  8 15:40:08 : BGP: 20::2 sending ROUTE_REFRESH AFI/SAFI (2/1) 
May  8 15:40:08 : BGP: 20::2 UPDATE rcvd packet len 56
May  8 15:40:08 : BGP: 20::2 rcvd UPDATE w/ attr: origin ?, path  200, nexthop 20.1.1.2, metric 0,

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