`vsx-sync bgp`

Syntax

vsx-sync bgp

no vsx-sync bgp

Description

Enables syncing of BGP configurations on the primary VSX switch to the secondary peer switch.

The no form of this command disables syncing BGP, as path lists, community lists, prefix lists, and route map configurations to the secondary peer, but it does not remove the previously synced configurations from the secondary peer switch.

Command context

config-vsx

Authority

Administrators or local user group members with execution rights for this command.

Usage

The following BGP configurations are synchronized: as path lists, community lists, prefix lists, and route map configurations. To maintain the uniqueness of a switch in the autonomous system, the BGP router ID, BGP cluster ID, and BGP neighbor update-source are not synchronized. This exclusion is required for BGP functionality to work seamlessly even with VSX topology.

Several settings are also not synced. The

neighbor 
		  <IP address> shutdown

setting is not synced because syncing that setting would cause both the primary and secondary VSX nodes towards the core to go down. In route map configurations, the following settings are also not synced from the primary VSX switch to the secondary VSX switch, because the next-hop is always set differently for the primary and secondary VSX peers:

set ip nexthop <IP-ADDR>
set ipv6 nexthop global <IP-ADDR>

If the next-hop must be same for both primary and secondary VSX peers, configure the same value on the individual switches.

Examples

Enabling VSX sync for the BGP configurations:

switch(config)#  ip aspath-list list1 seq 10 permit 10
switch(config)# ip community-list expanded com1 seq 10 permit 10
switch(config)# ip extcommunity-list standard ext1 seq 10 permit rt 10:4
switch(config)# ip prefix-list pref1 seq 10 permit any
switch(config)# route-map rm1 permit
switch(config-route-map-rm1-10)#  match ip next-hop 1.1.1.1
switch(config)#  router bgp 100
switch(config-bgp)# bgp router-id 1.1.1.1
switch(config-bgp)# neighbor 12.1.1.1 remote-as 1
switch(config-bgp)# address-family ipv4 unicast
switch(config-bgp-ipv4-uc)# neighbor 12.1.1.1 activate
switch(config)# vsx
switch(config-vsx)# vsx-sync bgp

Disabling VSX sync for the BGP configurations:

switch(config)# vsx
switch(config-vsx)# no vsx-sync bgp