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•
threshold—The percentage of the maximum number of prefixes BGP
configured for this neighbor. When the number of prefixes received from
the neighbor exceeds this percentage of the maximum, BGP writes a log
message. The range is 1 to 100 percent. The default is 75%. Unless
warning-only is specified, BGP shuts down the adjacency when the
threshold is reached.
•
unlimited—Do not enforce any prefix limit. Use this option when
inbound filtering will reduce the number received prefixes such that they
will fit in the routing table. Exceeding the capacity of the routing table will
cause the adjacency to be shut down unless the warning-only option is
configured.
•
warning-only—(Optional) If BGP receives more than the maximum
number of prefixes, BGP writes a log message rather than shutting down
the adjacency.
Default Configuration
There is no prefix limit by default. The default warning threshold is 75%. A
neighbor that exceeds the limit is shut down by removing the adjacency
unless the warning-only option is configured.
Command Mode
BGP Router Configuration mode
User Guidelines
If the peering session is shut down, the adjacency stays down until clear ip
bgp is issued for the neighbor.
Different limits can be set for IPv4 and IPv6. The VLAN interface must also
be specified if a link-local address is specified.
Command History
Introduced in version 6.2.0.1 firmware.
Example
console(config-router)#neighbor FE80::0202:B3FF:FE1E:8329 interface vlan 10
maximum-prefix unlimited
Layer 3 Routing Commands
1281
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