H3C S7500E Series Command Manual page 494

Command Manual – IPv4 Routing
H3C S7500E Series Ethernet Switches
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
5.1.79 timer
Syntax
timer keepalive keepalive hold holdtime
undo timer
View
BGP 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.
Use the undo timer command to restore the default.
By default, BGP keepalive and holdtime intervals are 60s and 180s.
Note that:
Timer configured using the peer timer command is preferred to the timer
configured using this command.
The holdtime interval must be at least three times the keepalive interval.
The configured timer applies to all the BGP peers, while it becomes valid only after
the corresponding BGP connections are reset.
Related commands: peer timer.
Chapter 5 BGP Configuration Commands
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