Allied Telesis Rapier 16Fi-FX Przewodnik Instalacji Pobierz pdf (Strona 118)

24 Software Reference

Static multicast

router ports

In some network configurations, the learning process cannot identify all router

ports. For such networks, you can statically configure particular ports as

multicast router ports.

To specify the static router ports, use the command:

add igmpsnooping vlan={vlan-name|1..4094}

routerport=port-list

To stop ports from being static router ports, use the command:

delete igmpsnooping vlan={vlan-name|1..4094}

routerport=port-list

To list the static router ports, use the command:

show igmpsnooping

Fast Leave

When an IGMP group-specific leave message is received on a port, IGMP

Snooping stops the transmission of the group multicast stream after a timeout

period. The lmqi (Last Member Query Interval) and lmqc (Last Member Query

Count) parameters of the set ip igmp command set the timeout period. This

timeout period allows other hosts on the port to register their membership of

the multicast group and continue receiving the stream.

The Fast Leave feature allows IGMP Snooping to stop the transmission of a

group multicast stream from a port as soon as it receives a leave message,

without waiting for the timeout period.

Use the Fast Leave feature to improve bandwidth management on ports that

are connected to a single host. Fast Leave should not be configured on a port

that has multiple hosts attached because it may adversely affect multicast

services to some hosts.

Fast Leave processing is disabled by default. To enable Fast Leave on a specific

VLAN, or all VLANs on the switch, use the command:

set igmpsnooping vlan={vlan-name|1..4094} fastleave={on|yes|

true}

To disable Fast Leave on a specific VLAN, or all VLANs on the switch, use the

command:

set igmpsnooping vlan={vlan-name|1..4094} fastleave={off|no|

false}

To display the current state of Fast Leave processing on a specific VLAN, or all

VLANs on the switch, use the command:

show igmpsnooping [vlan={vlan-name|1..4094}]

Query Solicitation

Query solicitation minimises loss of multicast data after a topology change on

networks that use spanning tree (STP, RSTP, or MSTP) for loop protection and

IGMP snooping.

When IGMP snooping is enabled on a VLAN, and Spanning Tree (STP, RSTP, or

MSTP) changes the underlying link layer topology of that VLAN, this can

interrupt multicast data flow for a significant length of time. Query solicitation

prevents this by monitoring the VLAN for any topology changes. When it

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