configure forwarding ipmc lookup-key

configure forwarding ipmc lookup-key [group-vlan | source-group-vlan | mac-vlan | mixed-mode]

Description

Enables you to choose the lookup-key for multicast forwarding.

Syntax Description


group-vlan	Specifies that IP multicast forwarding database entries are programmed as (*,GroupIP,VlanId).
source-group-vlan	Specifies that IP multicast forwarding database entries are programmed as (SourceIP, GroupIP, VlanId). (Default).
mac-vlan	Specifies that IP multicast forwarding database entries are programmed as (Mac, VlanId).
mixed-mode	Specifies that IP multicast forwarding database entries are programmed as follows: L3 cache entries (PIM/MVR/PVLAN) use source-group-vlan; L2 cache entries (IGMP/MLD/PIM snooping) use mac-vlan.

Default

source-group-vlan.

Usage Guidelines

Use this command to choose the lookup-key for multicast forwarding. The following restrictions apply to this command:

The configure forwarding ipmc lookup-key mac-vlan command is disallowed under the following conditions.

If IPMC forwarding is enabled on at least on one VLAN
If MVR is enabled either globally or on a VLAN
Similarly, enabling the above two features are disallowed,when the ipmc lookup-key is mac-vlan. The following warning message is displayed when the mac-valn option is specified:
```
Warning:  Usage of multicast IP addresses that could result in overlapping MAC addresses should be avoided. Example: Using 225.1.1.1, 226.1.1.1 and 225.129.1.1 should be avoided. Either one of the addresses could be used.  Using multicast with PVLAN should be avoided with this forwarding option.
```
Mixed-mode: configure forwarding ipmc lookup-key mixed-mode
The configure igmp snooping forwarding-mode [group-vlan | source-group-vlan] command was introduced to support (*, G, V) forwarding before the IPMC compression feature was introduced. Because we are introduced IPv6 multicast support in ExtremeXOS 15.2, this command is deprecated, and the new configure forwarding ipmc lookup-key command now covers both IPv4 and IPv6.

The following warning message appears when the mixed mode option is specified:

Warning: Usage of multicast IP addresses that could result in overlapping MAC addresses should be avoided for snooping (IGMP/MLD/PIM snooping) controlled traffic.

Example: Using 225.1.1.1, 226.1.1.1 and 225.129.1.1 should be avoided. Either one of the addresses could be used.

Example

The following command specifies that IP multicast forwarding database entries are programmed as (*,GroupIP,VlanId):

configure forwarding ipmc lookup-key group-vlan

To display the ipmc lookup-key configuration, enter the command:

show forwarding configuration

History

This command was first available in ExtremeXOS 15.3.

Platform Availability

This command is available on all ExtremeSwitching Universal switches.