summary-prefix

Configures summary prefixes to aggregate IPv6 Intermediate System-to-Intermediate System (IS-IS) route information.

Syntax

summary-prefix ipv6-prefix prefix-length { level-1 | level-2 }

no summary-prefix ipv6-prefix prefix-length { level-1 | level-2 }

Command Default

Disabled.

Parameters

ipv6-prefix prefix-length: Specifies the aggregate address. You must specify the ipv6-prefix parameter in hexadecimal using 16-bit values between colons as documented in RFC 2373. You must specify the prefix-length parameter as a decimal value. A slash mark (/) must follow the ipv6-prefix parameter and precede the prefix-length parameter.
level-1: Specifies that only routes redistributed into Level 1 are summarized
level-2: Specifies that only routes redistributed into Level 2 are summarized.

Modes

IS-IS address-family IPv6 unicast configuration mode

Usage Guidelines

IS-IS is supported on the Extreme 8820, SLX 9740, SLX 9640, and SLX 9540 devices only.

Route Summarization using this command is applicable only for redistributed routes.

The no form of the command disables route summarization.

Examples

The following example configures a summary prefix of 2001:db8::/32 to be advertised to Level 1 redistributed routes only.

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv4 unicast
device(config-router-isis-ipv4u)# summary-prefix 2001:db8::/32 level-1

The following example configures a summary prefix of 2001:db8::/32 to be advertised to Level 2 redistributed routes only.

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv4 unicast
device(config-router-isis-ipv4u)# summary-prefix 2001:db8::/32 level-2