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By default, upon receiving an IPv6 iBGP route, the BGP router only checks whether the next hop is
reachable before advertisement. If synchronization is enabled, the iBGP route can be advertised to
eBGP peers only when the route is also advertised by the IGP.
Examples
# Enable the route synchronization between IPv6 BGP and IGP.
<Sysname> system-view
[Sysname] bgp 100
[Sysname-bgp] ipv6-family
[Sysname-bgp-af-ipv6] synchronization
timer (IPv6 address family view)
Syntax
timer
keepalive keepalive hold holdtime
undo timer
View
IPv6 address family view
Default Level
2: System level
Parameters
keepalive
: Keepalive interval in seconds, ranging from 0 to 21845.
holdtime
: Holdtime interval in seconds, whose value is 0 or in the range of 3 to 65535.
Description
Use the
timer
command to specify the IPv6 BGP keepalive interval and holdtime interval.
Use the
undo timer
command to restore the default.
By default, the keepalive and holdtime intervals are 60s and 180s respectively.
Note that:
z
The timers configured with the
peer timer
command are preferred to the timers configured with
the
timer
command.
z
If the holdtime interval is configured as 0, no keepalive message will be sent to the peer, and the
peer connection will never time out. if the keepalive interval is configured as 0 and the negotiated
hold time is not 0, one third of the hold time is taken as the interval for sending keepalive
messages.
z
If neither the holdtime interval nor the keepalive interval is configured as 0, the holdtime interval
must be at least three times the keepalive interval.
z
The configured timers apply to all IPv6 BGP peers, while they become valid for an IPv6 BGP peer
only after the corresponding IPv6 BGP connection is reset.
z
After this command is executed, no peer connection is closed at once. The configured hold time is
used for negotiation when a peer relationship is reestablished.
Related commands:
peer timer
.
