Cisco Systems Cisco IOS XR Configuration Limiting, Static Route Configuration Limits, Limit Mode

Chapter 5 Configuring Additional Router Features

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.

Caution Overriding the default configuration limits can result in a low-memory condition.

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, 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

Static Route Configuration Limits

Table 5-4summarizes the maximum limits for static routes, including the commands used to display and change the limits.

Table 5-4	Static Route Configuration Limits and Commands
		Default	Absolute	Configuration Command
		Maximum	Maximum	(Static Router Configuration	Show Current Settings Command
Feature Limit Description		Limit	Limit	Mode)	(EXEC or Global Configuration Mode)
Maximum static IPv4		4000	40,000	maximum path ipv4 n	show running-config router static
routes
Maximum static IPv6		4000	40,000	maximum path ipv6 n	show running-config router static
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	OL-10957-02