Allied Telesis RAPIER I, X900-48FE, AT-8900 MLD and MLD Snooping Enhancements, MLD Packet Formats

112 MLD and MLD Snooping Enhancements Release Note

MLD and MLD Snooping Enhancements

This Software Version includes the following enhancements to MLD and MLD Snooping, in accordance with RFC 3810, Multicast Listener Discovery Version 2 (MLDv2) for IPv6:

■MLD Packet Formats

■ICMP type for MLDv2 Reports

■MLD Snooping Group Membership Display

■Change of Maximum Query Response Interval for MLD

This section describes the enhancements. The modified commands to implement them are described in Command Reference Updates.

MLD Packet Formats

MLD messages are now all sent with a hop limit of 1, a link-local source address, and the other format requirements of RFC 3810.

This enhancement did not affect any commands.

ICMP type for MLDv2 Reports

MLD Report messages now have an ICMP type of 143 by default, as specified by RFC 3810. The previous value was 255.

If you need to maintain backwards compatibility with earlier releases that use an ICMP type of 255, you can do so by using the new v2draftcompat=yes option in the command:

enable ipv6 mld interface=interface [v2draftcompat={yesno}]

This enables the interface to receive MLDv2 reports with an ICMP type of 255.

The default for v2draftcompat is no.

Command Changes

The following table summarises the modified commands:

CommandChange

enable ipv6 mld interface New v2draftcompat parameter

show ipv6 mld New V2 Draft Compatible parameter in output.

Software Version 2.8.1 C613-10477-00 REV B