Bgp Configuration Limits - Cisco Router IOS XR Getting Started Manual

Configuration Limiting
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 'cisco'.
the changes.
RP/0/RP1/CPU0:Mar 30 18:05:13 : config[65740]: %SYS-5-CONFIG_I : Configured from
console by cisco
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.
summarizes the maximum configuration limits for BGP.
Table 5-7 BGP Configuration Limits and Commands
Feature Limit Description
Maximum number of neighbors
(peers)
IPv4 unicast maximum prefixes
that can be received from a
neighbor
IPv4 multicast maximum prefixes
that can be received from a
neighbor
IPv6 unicast maximum prefixes
that can be received from a
neighbor
Maximum equal-cost parallel
routes to external peers
Cisco IOS XR Getting Started Guide
5-20
Use 'show configuration commit changes 1000000542' to view
Default Absolute
Maximum Maximum Configuration Command
Limit Limit (Router Configuration Mode)
1024 1024 None. This limit cannot be
changed or exceeded.
524,288 4,294,967, maximum-prefix n
295
131,072 4,294,967, maximum-prefix n
295
131,072 4,294,967, maximum-prefix n
295
1 8 maximum-paths n
Chapter 5 Configuring Additional Router Features
Show Current Settings Command
(EXEC Mode)
None
show bgp neighbor IP_address
show bgp neighbor IP_address
show bgp neighbor IP_address
show running-config
This command shows
Note
only changes to the
default value. If the
maximum paths
command does not
appear, the router is set
to the default value.
Table 5-7
OL-10957-02