KB.15.15

You can also combine the ip igmp command with other IGMP-related commands, as described

in the following sections.

Configuring per-port IGMP traffic filters

Syntax:

vlan vid ip igmp [ auto port-list | blocked port-list |

forward port-list ]

Used in the VLAN context, specifies how each port should handle IGMP traffic.

Default: auto.

NOTE: Where a static multicast filter is configured on a port, and an IGMP filter

created by this command applies to the same port, the IGMP filter overrides the

static multicast filter for any inbound multicast traffic carrying the same multicast

address as is configured in the static filter. For more information, see the

Management and Configuration Guide for your switch.

Example:

Suppose you want to configure IGMP as follows for VLAN 1 on the 100/1000T

ports on a module in slot 1:

Filter multicast traffic. Forward

IGMP traffic to hosts on these

autoPorts A1-A2

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.)

Forward all multicast traffic

through this port.

forwardPorts A3-A4

Drop all multicast traffic received

from devices on these ports.

blockedPorts A5-A6

For a description of the default behavior of data-driven switches, see “Automatic

fast-leave IGMP” (page 27).

Depending on the privilege level, you could use one of the following commands to

configure IGMP on VLAN 1 with the above settings:

HP Switch(config)# vlan 1 ip igmp auto a1,a2 forward a3,a4

blocked a5,a6

HP Switch(vlan-1)# ip igmp auto a1,a2 forward a3,a4

blocked a5,a6

The following command displays the VLAN and per-port configuration resulting

from the above commands.

HP Switch show igmp vlan 1 config

Configuring the querier function

Syntax:

[no] vlan vid ip igmp querier

Configuring and displaying IGMP (CLI) 19