Cabletron Systems CoreWatch, User Manual

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CoreWatch User’s Manual 429
Chapter 20: Checking the Status of Routing Tables
The following table describes the fields of the
IGMP Cache
table's upper frame. The
Selection Details frame displays information about the item currently selected in the
upper frame. For details on using the Table toolbar, see
Appendix A: “Working with
Tables” on page 443 .
Table 71. IGMP Cache table fields
Field Description
IP Multicast Address Identifies the IP address of the multicast group.
IGMP Interface Indicates the interface on which the IP multicast group is
configured.
Cache Status Indicates whether the multicast group on the interface is
active, not in service, not ready, create and go, create and wait,
or destroyed.
Local Membership Indicates whether a router is a member of the group. The SSR
is never a member of a group.
Member Since Indicates how long ago the SSR joined the multicast group
address. A 0 signifies that the SSR is not a member of the
group.
Last Reported
Member Identifies the IP address of the source that sent the SSR the last
membership report for the multicast group on the interface
identified in the IGMP Interface field. An IP address of 0.0.0.0
signifies that the SSR has not received a membership report on
the multicast group's interface.
Cache Expiry Time Indicates the minimum amount of time remaining before the
entry will be deleted from the IGMP Cache table.
Time Before Expiry Indicates how much longer the SSR will assume that there are
no IGMP version 1 members on the IP subnetwork attached to
the multicast group's interface. If this time is greater than 0,
any version 2 IGMP messages the SSR receives on the interface
are ignored.
SSR resets this field whenever it receives a version 1 IGMP
membership report on the interface.