Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 10
3Com Corporation
10-32
Parameter
multicast-group: IP address of the multicast group in dotted decimal notation, such as
224.0.0.1.
Description
Use the display ip multicast-fast-forwarding cache command to display summary
information about the fast forwarding table entries in the multicast fast forwarding
cache.
If you issue the command without specifying the argument, summary information about
all fast forwarding table entries in the multicast fast forwarding cache is displayed. If you
issue the command with a multicast address specified, summary information about all
fast forwarding table entries related to the multicast address is displayed. The output
information of the command includes the source address, source port number,
multicast address, destination port number, protocol number (which is usually the
number for UDP), inbound interface, outbound interface, and status of the outbound
interface (that is, whether the link layer header is present).
Example
# Display summary information about all fast forwarding table entries related to a
specified multicast address in the cache.
<3Com> display ip multicast-fast-forwarding cache 225.1.2.3
Multicasting fast-forwarding cache: total 120 items
Multicasting fast-Forwarding cache by selected group: 10 items
----------------------------------------------------------------------
Source Address:Port Group Address:Port Prot RecvInterface SendInterface L2H
156.43.56.34:1057 225.1.2.3:1058 0x11 E 0/0/0 E 0/0/1 Yes
E 2/0/0 No
E 2/0/1 Yes
Table 10-4 Description on the fields of display ip multicast-fast-forwarding cache
Field Description
Multicasting fast-forwarding cache
Total number of fast forwarding table
entries in the multicast fast forwarding
cache
Multicasting fast-Forwarding cache by
selected group
Number of fast forwarding table entries
related to the specified multicast group
in the multicast fast forwarding cache
Source Address:Port Source address and source port number
Group Address:Port
Multicast address and destination port
number