Configuration Limiting; Static Route Configuration Limits - Cisco Router IOS XR Getting Started Manual

Configuration Limiting

Configuration Limiting

The Cisco IOS XR software places preset limits on the configurations you can apply to the running
configuration of a router. These limits ensure that the router has sufficient system resources (such as
RAM) for normal operations. Under most conditions, these preset limits are sufficient.
In some cases, for which a large number of configurations is required for a particular feature, it may be
necessary to override the preset configuration limits. This override can be done only if configurations
for another feature are low or unused. For example, if a router requires a large number of BGP
configurations and Multiprotocol Label Switching (MPLS) is not being used at all, then the BGP limits
can be increased to use the unused memory assigned to MPLS.
Overriding the default configuration limits can result in a low-memory condition.
Caution
The following sections describe the limits you can configure, default and maximum values, and
commands for configuring and displaying the configuration limits:
•
•
•
•
•
•
•

Static Route Configuration Limits

Table 5-4
change the limits.
Table 5-4 Static Route Configuration Limits and Commands
Feature Limit Description
Maximum static IPv4
routes
Maximum static IPv6
routes
Examples
In the following example, the maximum number of static IPv4 routes is changed to 5000 and the new
configuration is displayed.
RP/0/RP1/CPU0:router# configure
RP/0/RP1/CPU0:router(config)# router static
RP/0/RP1/CPU0:router(config-static)# maximum path ipv4 5000
RP/0/RP1/CPU0:router(config-static)# commit
Cisco IOS XR Getting Started Guide
5-16
Static Route Configuration Limits, page 5-16
IS-IS Configuration Limits, page 5-17
OSPFv2 and v3 Configuration Limits, page 5-17
BGP Configuration Limits, page 5-20
Routing Policy Language Line and Policy Limits, page 5-21
Multicast Configuration Limits, page 5-23
MPLS Configuration Limits, page 5-23
summarizes the maximum limits for static routes, including the commands used to display and
Default Absolute Configuration Command
Maximum Maximum (Static Router Configuration
Limit Limit Mode)
4000 40,000 maximum path ipv4 n
4000 40,000 maximum path ipv6 n
Chapter 5 Configuring Additional Router Features
Show Current Settings Command
(EXEC or Global Configuration Mode)
show running-config router static
show running-config router static
OL-10957-02