Tripp Lite NGI-M05-C1, Руководство пользователя, Страница: 79 / 254

79
6.2.1.2. Port Settings
Immediate Leave
When you enable IGMP Immediate-Leave processing, the switch immediately removes a
port when it detects an IGMP version 2 leave message on that port. You should use the
Immediate-Leave feature only when there is a single receiver present on every port in the
VLAN. (Immediate Leave is only supported on IGMP Version 2 hosts).
The switch uses IGMP snooping Immediate Leave to remove from the forwarding table an
interface that sends a leave message without the switch sending group-specific queries to
the interface. The VLAN interface is pruned from the multicast tree for the multicast group
specified in the original leave message. Immediate Leave ensures optimal bandwidth
management for all hosts on a switched network, even when multiple multicast groups are
simultaneously in use.
Without Immediate Leave, when the switch receives an IGMP leave message from a
subscriber on a receiver port, it sends out an IGMP specific query on that port and waits
for IGMP group membership reports. If no reports are received in a configured time period,
the receiver port is removed from multicast group membership.
Port IGMP Querier Mode

Auto:
The Switch uses the port as an IGMP query port if the port receives IGMP query
packets.

Fixed:
The Switch always treats the port(s) as IGMP query port(s). This is for when
connecting an IGMP multicast server to the port(s). The Switch always forwards the
client’s report/leave packets to the port.
Normally, the port is connected to an IGMP server.

Edge:
The Switch does not use the port as an IGMP query port. The IGMP query packets
received by this port will be dropped.
Normally, the port is connected to an IGMP client.
Note: The Switch will forward the IGMP join and leave packets to the query port.
6.2.1.2.1. CLI Configuration
Node Command Description
enable show igmp-snooping This command displays the current IGMP
snooping configurations.
enable configure terminal This command changes the node to configure
node.