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◆
Multicast Router Termination – These messages are sent when a router stops IP
multicast routing functions on an interface. Termination messages are sent by
multicast routers when:
Multicast forwarding is disabled on an interface.
■
An interface is administratively disabled.
■
The router is gracefully shut down.
■
Advertisement and Termination messages are sent to the All-Snoopers multicast
address. Solicitation messages are sent to the All-Routers multicast address.
Note:
MRD messages are flooded to all ports in a VLAN where IGMP snooping or
routing has been enabled. To ensure that older switches which do not support MRD
can also learn the multicast router port, the switch floods IGMP general query
packets, which do not have a null source address (0.0.0.0), to all ports in the
attached VLAN. IGMP packets with a null source address are only flooded to all
ports in the VLAN if the system is operating in multicast flooding mode, such as
when a new VLAN or new router port is being established, or an spanning tree
topology change has occurred. Otherwise, this kind of packet is only forwarded to
known multicast routing ports.
Parameters
These parameters are displayed:
◆
VLAN – ID of configured VLANs. (Range: 1-4093)
◆
IGMP Snooping Status – When enabled, the switch will monitor network
traffic on the indicated VLAN interface to determine which hosts want to
receive multicast traffic. This is referred to as IGMP Snooping. (Default: Enabled)
When IGMP snooping is enabled globally (see
interface settings for IGMP snooping take precedence.
When IGMP snooping is disabled globally, snooping can still be configured per
VLAN interface, but the interface settings will not take effect until snooping is
re-enabled globally.
◆
Version Exclusive – Discards any received IGMP messages (except for multicast
protocol packets) which use a version different to that currently configured by
the IGMP Version attribute. (Default: Disabled)
If version exclusive is disabled on a VLAN, then this setting is based on the
global setting configured on the Multicast > IGMP Snooping > General page. If
it is enabled on a VLAN, then this setting takes precedence over the global
setting.
◆
Immediate Leave Status – Immediately deletes a member port of a multicast
service if a leave packet is received at that port and immediate leave is enabled
for the parent VLAN. (Default: Disabled)
– 541 –
Chapter 16
| Multicast Filtering
Layer 2 IGMP (Snooping and Query)
page
532), the per VLAN
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