C613-50631-01 Rev A Command Reference for IE340 Series 1597
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
BGP AND BGP4+ COMMANDS
SYNCHRONIZATION
synchronization
Overview Use this command in Router Configuration mode or in Address Family
Configuration mode to ensure BGP does not advertise router learned from iBGP
peers until they are learned locally, or are propagated throughout the AS via an
IGP.
Use the no variant of this command to disable this function.
Syntax
synchronization
no synchronization
Default Disabled.
Mode Router Configuration and Address Family Configuration mode
Usage notes Synchronization is used when a BGP router should not advertise routes learned
from iBGP neighbors, unless those routes are also present in an IGP (for example,
OSPF). These routes must be in the RIB (Routing Information Base) learned locally
or via an IGP.
Synchronization may be enabled when all the routers in an autonomous system do
not speak BGP, and the autonomous system is a transit for other autonomous
systems.
Use the no synchronization command when BGP router can advertise routes
learned from iBGP neighbors, without waiting for IGP reachability, when routes are
in the RIB.
Example The following example enables IGP synchronization of iBGP routes in Router
Configuration mode:
awplus# configure terminal
awplus(config)# router bgp 11
awplus(config-router)# synchronization
The following example enables IGP synchronization of iBGP routes in IPv4 unicast
Address Family Configuration mode:
awplus# configure terminal
awplus(config)# router bgp 11
awplus(config)# address-family ipv4 unicast
awplus(config-af)# synchronization
The following example enables IGP synchronization of iBGP routes in the IPv6
unicast Address Family Configuration mode:
awplus# configure terminal
awplus(config)# router bgp 11
awplus(config)# address-family ipv6 unicast
awplus(config-af)# synchronization
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