Administrator Guide

Layer 3 Routing Commands 1300
• interface-id —If the neighbor’s IPv6 address is a link local address, the local
VLAN routing interface must also be specified.
•
maximum —The maximum number of prefixes BGP will accept from this
neighbor. Range 0-4294967295. Values greater than the free space in the
route table are not enforced.
•
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
IPv6 Address Family 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. In IPv6 address family mode,
the command accepts either an IPv4 or an IPv6 address.
2CSNXXX_SWUM204.book Page 1300 Monday, January 25, 2016 1:25 PM