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1012 CHAPTER 72: BGP CONFIGURATION COMMANDS
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-vpn1] summary automatic
synchronization (BGP view)
Syntax synchronization
undo synchronization
View BGP view
Parameters None
Description Use the
synchronization command to enable the synchronization between the
BGP and IGP routes.
Use the
undo synchronization command to disable the synchronization.
The feature is disabled by default.
With this feature enabled and when a non-BGP router is responsible for
forwarding packets in an AS, BGP speakers in the AS cannot advertise routing
information to other ASs unless all routers in the AS know the latest routing
information.
When a BGP router receives an IBGP route, it checks only whether the next hop is
reachable by default. If the synchronization is enabled, the IBGP route is
synchronized and advertised to EBGP peers only when the route is also advertised
by IGP. Otherwise, the IBGP route cannot be advertised to EBGP peers.
Examples # Enable the synchronization between BGP and IGP routes.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] synchronization
timer (BGP/BGP-VPN instance view)
Syntax timer keepalive keepalive hold holdtime
undo timer
View BGP view/BGP-VPN instance view
Parameters keepalive: Keepalive interval in seconds, ranging from 1 to 21845.
holdtime: Holdtime interval in seconds, ranging from 3 to 65535.
Description Use the
timer command to configure BGP keepalive interval and holdtime
interval.