User Guide

3-22
Cisco IOS XR Getting Started Guide
Chapter 3 Configuring Additional Router Features
Configuration Limiting
Maximum Routes Redistributed into OSPF
In the following example, the maximum redistributed-prefixes command is used to set the maximum
routes redistributed into OSPF:
RP/0/RP1/CPU0:router# configure
RP/0/RP1/CPU0:router(config)# router ospf 100
RP/0/RP1/CPU0:router(config-router)# maximum redistributed-prefixes 12000
RP/0/RP1/CPU0:router(config-router)# end
Uncommitted changes found, commit them? [yes]: y
RP/0/RP1/CPU0:Mar 30 16:26:52 : config[65740]: %LIBTARCFG-6-COMMIT : Configurati
on committed by user 'lab'. Use 'show configuration commit changes 1000000541' to view
the changes.
RP/0/RP1/CPU0:Mar 30 16:26:52 : config[65740]: %SYS-5-CONFIG_I : Configured from
console by lab
RP/0/RP1/CPU0:router#
Number of Parallel Links (max-paths)
In the following example, the maximum paths command is used to set the maximum number of parallel
routes:
RP/0/RP1/CPU0:router# configure
RP/0/RP1/CPU0:router(config)# router ospf 100
RP/0/RP1/CPU0:router(config-router)# maximum paths 10
RP/0/RP1/CPU0:router(config-router)# end
Uncommitted changes found, commit them? [yes]: y
RP/0/RP1/CPU0:Mar 30 18:05:13 : config[65740]: %LIBTARCFG-6-COMMIT : Configurati
on committed by user 'lab'. Use 'show configuration commit changes 1000000542' to view
the changes.
RP/0/RP1/CPU0:Mar 30 18:05:13 : config[65740]: %SYS-5-CONFIG_I : Configured from
console by lab
RP/0/RP1/CPU0:router#
BGP Configuration Limits
The maximum number of BGP neighbors (peers) that can be configured is 1024. This number cannot be
changed through configuration. Any attempt to configure additional neighbors beyond the limit fails.
To prevent neighbors (peers) from flooding BGP with advertisements, a limit is placed on the number of
prefixes that can be accepted from a peer for each supported address family.
You can override the default limits for an address family with the maximum-prefix command. Table 3-7
summarizes the maximum configuration limits for BGP.
Table 3-7 BGP Configuration Limits and Commands
Feature Limit Description
Default
Maximum
Limit
Absolute
Maximum
Limit
Configuration Command
(Router Configuration Mode)
Show Current Settings Command
(EXEC Mode)
Maximum number of neighbors
(peers).
1024 1024 None. This limit cannot be
changed or exceeded.
None
IPv4 unicast maximum prefixes
that can be received from a
neighbor
524,288 4,294,967,
295
maximum-prefix n show bgp neighbor IP_address