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1266 CHAPTER 82: IPV6 BGP CONFIGURATION COMMANDS
Description Use the synchronization command to enable the synchronization between IPv6
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, IPv6 BGP speakers in the AS cannot advertise routing
information to other ASs unless all routers in the AS know the latest routing
information.
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
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 specify 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:
■ Timer configured using the peer timer command is preferred to the timer
configured using the timer command.
■ The holdtime interval must be at least three times the keepalive interval.
■ The configured timer applies to all the IPv6 BGP peers. It becomes valid only
after the corresponding IPv6 BGP connections are reset.