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Cisco IOS XR Getting Started Guide
OL-14361-01
Chapter5 Configuring Additional Router Features
Configuration Limiting
A cease-notification message is sent to the neighbor and the peering with the neighbor is terminated
when the number of prefixes received from the peer for a given address family exceeds the maximum
limit (either set by default or configured by the user) for that address family.
However, if the warning-only keyword (for the maximum-prefix command) is configured, the
Cisco IOS XR software sends only a log message, but continues peering with the sender. If the peer is
terminated, the peer stays down until the clear bgp command is issued.
The same set of actions (sending cease notification followed by the termination of the peering) is taken
for a neighbor with which peering has already been established if you decide to configure a maximum
that is less than the number of prefixes that have already been received from the neighbor.
Examples
The following example shows how to set the BGP configuration limits:
RP/0/RP1/CPU0:router# configure
RP/0/RP1/CPU0:router(config)# router bgp 100
RP/0/RP1/CPU0:router(config-bgp)# neighbor 10.1.1.1
RP/0/RP1/CPU0:router(config-bgp-nbr)# remote-as 1
RP/0/RP1/CPU0:router(config-bgp-nbr)# address-family ipv4 unicast
RP/0/RP1/CPU0:router(config-bgp-nbr-af)# maximum-paths 4
RP/0/RP1/CPU0:router(config-bgp-nbr-af)# maximum-prefix 100000
RP/0/RP1/CPU0:router(config-bgp-nbr-af)# commit
RP/0/RP1/CPU0:Mar 30 19:13:16 : config[65740]: %LIBTARCFG-6-COMMIT : Configuration
committed by user 'cisco'. Use 'show configuration commit changes 1000000544' to view
the changes.
RP/0/RP1/CPU0:Mar 30 19:13:17 : config[65740]: %SYS-5-CONFIG_I : Configured from console
by cisco
RP/0/RP1/CPU0:router(config-bgp-nbr-af)#
Routing Policy Language Line and Policy Limits
Two limits for Routing Policy Language (RPL) configurations exist:
1. Number of RPL lines: The number of configuration lines entered by the user, including the
beginning and ending statements (that is “route-policy”). The number of configuration lines for sets
is also included.
2. Number of RPL policies: The number of policies that can be configured on the router. Policies are
counted only once: Multiple use of the same policy counts as a single policy toward the limit 1.
The limits for RPL lines and policies are summarized in Table 5 -8. You can change the default values up
to the absolute maximum, but you cannot change the value to a number less than the number of items
that are currently configured.
Table5-8 Maximum Lines of RPL: Configuration Limits and Commands
Limit Description
Default
Maximum
Limit
Absolute
Maximum
Limit
Configuration Command
(Global Configuration Mode)
Show Current Settings
Command
(EXEC Mode)
Maximum number of RPL lines 65,536 131,072 rpl maximum lines nshow rpl maximum lines
Maximum number of RPL policies 3500 5000 rpl maximum policies nshow rpl maximum
policies