multicast6 fast-convergence

Configures a device to listen to topology change events in Layer 2 protocols such as spanning tree, and then send general queries to shorten the convergence time.
Syntax
multicast6 fast-convergence
no multicast6 fast-convergence
Command Default

Fast convergence is not configured.

Modes

VLAN configuration mode

Usage Guidelines

The no form of this command restores the default; fast convergence is not configured.

Configure the multicast6 fast-convergence command to allow a device to listen to topology change events in Layer 2 protocols, such as Spanning Tree, and send general queries to shorten the convergence time.

If the Layer 2 protocol cannot detect a topology change, fast convergence may not work in some cases. For example, if the direct connection between two devices switches from one interface to another, the Rapid Spanning Tree protocol (802.1w) considers this to be optimization rather than a topology change. In this case, other devices do not receive topology change notifications and cannot send queries to speed up convergence. The original spanning tree protocol does not recognize optimization actions, and fast convergence works in all cases.

Examples

This example configures fast convergence on VLAN 70. 

device# configure terminal
device(config)# vlan 70
device(config-vlan-70)# multicast6 fast-convergence
Parent topic: Commands M