R3303-HP 6600/HSR6600 Routers Layer 3 - IP Routing Command Reference

295
[Sysname] bgp 100
[Sysname-bgp] ipv4-family vpn-instance vpn1
[Sysname-bgp-ipv4-vpn1] summary automatic
synchronization (BGP view)
Use synchronization to enable the synchronization between the BGP and IGP routes.
Use undo synchronization to disable the synchronization.
Syntax
synchronization
undo synchronization
Default
The feature is disabled.
Views
BGP view
Default command level
2: System level
Usage guidelines
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)
Use timer to configure the global keepalive interval and holdtime.
Use undo timer to restore the default.
Syntax
timer keepalive keepalive hold holdtime
undo timer
Default
The BGP keepalive interval and the holdtime are 60 seconds and 180 seconds, respectively.