Configuring IP Multicast Protocols
December 2005 © Foundry Networks, Inc. 19 - 27
Displaying Information About an Upstream Neighbor Device
You can view information about the upstream neighbor device for a given source IP address for IP Protocol
Independent Multicast (PIM) and Distance Vector Multicast Routing Protocol (DVMRP) packets. For PIM, the
software uses the IP route table or multicast route table to lookup the upstream neighbor device. For DVMRP, the
software uses the DVMRP route table to locate the upstream neighbor device.
Enter the following command at the Privileged EXEC level of the CLI:
FastIron SuperX Router# show ip pim rpf 1.1.20.2
directly connected or via an L2 neighbor
Syntax: show ip pim | dvmrp rpf <IP address>
where <IP address> is a valid source IP address
NOTE: If there are multiple equal cost paths to the source, the show ip pim rpf command output may not be
accurate. If your system has multiple equal cost paths, use the command sh ip pim mcache to view information
about the upstream neighbor. For more information about this command, see the Foundry Switch and Router
Command Line Interface Reference.
Displaying the PIM Flow Cache
To display the PIM flow cache, enter the following command at any CLI level:
Syntax: show ip pim flowcache
Holdtime sec Indicates how many seconds the neighbor wants this Layer 3 Switch
to hold the entry for this neighbor in memory. The neighbor sends the
Hold Time in its Hello packets.
• If the Layer 3 Switch receives a new Hello packet before the
Hold Time received in the previous packet expires, the Layer
3 Switch updates its table entry for the neighbor.
• If the Layer 3 Switch does not receive a new Hello packet
from the neighbor before the Hold time expires, the Layer 3
Switch assumes the neighbor is no longer available and
removes the entry for the neighbor.
Age sec The number of seconds since the Layer 3 Switch received the last
hello message from the neighbor.
UpTime sec The number of seconds the PIM neighbor has been up. This timer
starts when the Layer 3 Switch receives the first Hello messages from
the neighbor.
This Field... Displays...
FastIron SuperX Router(config-pim-router)# show ip pim flowcache
Source Group Parent CamFlags CamIndex Fid Flags
1 209.157.24.162 239.255.162.1 v2 00000700 2023 00004411 F
2 209.157.24.162 239.255.162.1 v2 00000700 201b 00004411 F
3 209.157.24.162 239.255.162.1 v2 00000700 201d 00004411 F
4 209.157.24.162 239.255.162.1 v2 00000700 201e 00004411 F
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