3com MSR 20-20 참조 매뉴얼

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HAPTER

 82: IP

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6 BGP C

ONFIGURATION

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OMMANDS

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.

# 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 keepalive keepalive hold holdtime

IPv6 address family view

keepalive: Keepalive interval in seconds, ranging from 1 to 21845.

holdtime: Holdtime interval in seconds, ranging from 3 to 65535.

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.