> Source: [sk31934](https://support.checkpoint.com/results/sk/sk31934)

# sk31934 - ClusterXL IGMP Membership

| Property | Value |
|----------|-------|
| Solution ID | sk31934 |
| Date Created | 2006-07-23 |
| Last Modified | 2020-07-07 |
| Technical Level | Advanced |
| Products | Security Gateway |
| Versions | R82.10, R82, R81.20 |

## Symptoms

- ClusterXL does not work with some switches that have the IGMP Snooping feature enabled.

## Cause

CCP packets are sent to Multicast MAC address 01:00:5E:X:Y:Z (by default, CCP runs in multicast mode).

If IGMP Snooping is enabled on a switch, it expects the source hosts of these multicast CCP packets to subscribe (join) to an IGMP Group.

If IGMP Membership is disabled on ClusterXL members (i.e. `fwha_enable_igmp_snooping=0`), the cluster members do not subscribe to an IGMP Group. As a result, the switch does not forward these multicast CCP packets because there are no subscribers for such multicast packets (this is done to avoid unsolicited traffic on the network).

**Note:** IGMP Membership is enabled by default starting in R75.40 (i.e., `fwha_enable_igmp_snooping=1`).

## Solution

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