Synchronization (Bgp View) - H3C S9500 Series Command Manual

Command Manual – BGP
H3C S9500 Series Routing Switches

1.1.79 synchronization (BGP view)

Syntax
synchronization
undo synchronization
View
BGP view
Default Level
2: System level
Parameters
None
Description
Use the synchronization command to enable the synchronization between BGP and
IGP.
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 device 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
1.1.80 timer (BGP/BGP-VPN instance view)
Syntax
timer keepalive keepalive hold holdtime
undo timer
Chapter 1 BGP Configuration Commands
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