multi-topology

Enables IPv6 Intermediate System-to-Intermediate System (IS-IS) MT in an area or a domain so that the MT-enabled device runs IPv6 IS-IS in multi-SPF mode.

Syntax

multi-topology [ transition ]

no multi-topology [ transition ]

Command Default

The transition option is disabled.

Parameters

transition: Enables IPv6 IS-IS MT transition mode in an area or a domain so that a network operating in IPv6 IS-IS single-topology support mode can continue to work while upgrading devices to include IPv6 IS-IS MT support.

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.

When transition mode is not enabled, the routers operating in single-topology mode do not establish IPv6 connectivity with the routers operating in MT mode.

The no multi-topology form of the command disables IPv6 IS-IS MT.

The no multi-topology transition form of the command disables transition mode.

Examples

The following example enables IPv6 IS-IS MT.

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv6 unicast
device(config-router-isis-ipv6u)# multi-topology

The following example enables IPv6 IS-IS MT with transition support.

device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv6 unicast
device(config-router-isis-ipv6u)# multi-topology transition