Cisco CRS-1 - Carrier Routing System Router Getting Started Guide

5-23
Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Chapter 5 Initial Configuration of the Cisco IOS XR Software
Configuration Limiting
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 commit changes 1000000542' to view the c
hanges.
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 will fail.
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 5-10 summarizes the maximum configuration limits for BGP.
Table 5-10 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).
1,024 1,024 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
IPv4 multicast maximum prefixes
that can be received from a
neighbor
131,072 4,294,967,
295
maximum-prefix n show bgp neighbor IP_address
IPv6 unicast maximum prefixes
that can be received from a
neighbor
131,072 4,294,967,
295
maximum-prefix n show bgp neighbor IP_address
Maximum equal-cost parallel
routes to external peers
18maximum-paths n show running-config
Note This command only
shows changes to the
default value. If the
maximum paths
command does not
appear, the router is set
to the default value.

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English