Concept Guide

If neighbor soft-reconfiguration inbound command is not congured ever in the router, then doing a soft reset is enough for
the route refresh updates to be sent.
Route-refresh updates for IPv4 and IPv6 prexes
This section explains the route-refresh functionality in dierent combinations for IPv4 or IPv6 prex congured with IPv4 or IPv6
neighbors.
By default, the IPv4 prexes is sent for all the neighbors irrespective of IPv4 address family is enabled or disabled. Following are the
dierent scenarios during which the route-refresh message is sent for the corresponding neighbors:
By default, the route-refresh message for IPv4 prexes is sent for both the IPv4 and IPv6 neighbors. Following is an example conguration
in which IPv4 prexes 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 conguration, 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 conguration in which IPv6 prexes 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)
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Border Gateway Protocol (BGP)