# Displaying IGMP cache information using EDM

Use the following procedure to display IGMP cache information to show the learned multicast groups in the cache and the IGMPv1 version timers.

## Prerequisites

- Open one of the supported browsers.

- Enter the IP address of the switch to open an EDM session.

## Procedure steps

1. From the navigation tree, double-click IP Routing.

2. In the IP Routing tree, double-click IGMP.

3. In the work area, click the Cache tab to view the IGMP cache information.

## Variable definitions

The following table describes the fields of the Cache tab.

Field | Description
--- | ---
Address | Indicates the IP multicast group address.
IfIndex | Indicates the VLAN interface from which the group address is heard.
LastReporter | Indicates the last IGMP host to join the group.
ExpiryTime | Indicates the amount of time (in seconds) remaining before this entry is aged out.
Version1Host Timer | Indicates the time remaining until the local router assumes that no IGMP version 1 members exist on the IP subnet attached to the interface. Upon hearing an IGMPv1 membership report, this value is reset to the group membership timer. When the time remaining is nonzero, the local interface ignores IGMPv2 Leave messages that it receives for this group.
Type | Indicates whether the entry is learned dynamically or is added statically.