Multimedia Traffic Control with IP Multicast (IGMP)

IGMP Operating Features

Configuring Per-Port IGMP Packet Control. Use this command in the

VLAN context to specify how each port should handle IGMP traffic.

 

Syntax:

vlan < vlan-id> ip igmp

 

 

 

 

[auto <port-list> blocked <port-list> forward <port-list>]

 

Default:

auto

 

 

 

 

N o t e

The blocked feature does not operate on a port if the port either detects a

 

 

router or belongs to multiple VLANs and is configured with forward on one of

 

 

these other VLANs.

 

 

For example, suppose you wanted to configure IGMP as follows for VLAN 1

 

 

on the 10/100 ports on the switch:

 

 

 

 

 

 

 

Ports A1-A7

auto

Filter multicast traffic. Forward IGMP traffic to hosts on these ports

 

 

 

 

that belong to the multicast group for which the traffic is intended.

 

 

 

 

(Also forward any multicast traffic through any of these ports that

 

 

 

 

is connected to a multicast router.)

 

 

 

 

 

 

 

Port A8

forward

Forward all multicast traffic through this port.

 

 

 

 

 

 

 

Ports A9-A12

blocked

Drop all multicast traffic received from devices on these ports, and

 

 

 

 

prevent any outgoing multicast traffic from moving through these

 

 

 

 

ports.

 

 

 

 

 

Depending on the privilege level, you could use one of the following com­ mands to configure IGMP on VLAN 1 with the above settings:

HPswitch(config)# vlan 1 ip igmp auto a1-a7 forward a8 blocked a9-a12

HPswitch(vlan-1)# ip igmp auto a1-a7 forward a8 blocked a9- a12

The following command displays the VLAN and per-port configuration result­ ing from the above commands.

HPswitch> show ip igmp 1 config

Configuring IGMP Traffic Priority. This command assigns “high” priority to IGMP traffic or returns a high-priority setting to “normal” priority.

Syntax: vlan < vlan-id> ip igmp high-priority-forward

Default: normal

 

HPswitch(config)# vlan 1 ip igmp

Configures high priority for

high-priority-forward

IGMP traffic on VLAN 1.

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