Description of the Mrinfo.exe Tool for Command-Line Access to Multicast Routing (225158)

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Command Syntax

Syntax: mrinfo [-n] [-i address] [-t secs] [-r retries] destination

Parameter	Usage
-?	Displays Help.
-n	Disables name resolution on returned neighbors.
-i address	Address of interface to which to submit query.
-t seconds	Time to wait for IGMP query responses.
-r retries	Number of retry attempts for SNMP queries.
destination	Address or name of destination router.

Example

mrinfo -i 172.16.174.66 172.16.174.1

172.16.172.1 (router1.test.com.) [version 11.1,prune,mtrace,snmp]
172.16.172.1 --> 0.0.0.0 (local) [1/0/pim/querier/leaf]
172.16.245.227 --> 172.16.245.229 (router9.test.com.) [1/0/pim]
172.16.245.227 --> 172.16.245.225 (router5.test.com.) [1/0/pim]
172.16.245.227 --> 172.16.245.228 (router8.test.com.) [1/0/pim]
172.16.245.227 --> 172.16.245.226 (router6.test.com.) [1/0/pim]

This query is sent out the 172.16.174.66 interface. The address being queried has two interfaces: 172.16.172.1 and 172.16.245.227. The arrow shows the neighboring interfaces for this router. "0.0.0.0" means that there are no neighboring routers from this interface.

"[1/0/pim/querier/leaf]" has the following fields:

• Metric: The cost of the link; used in routing calculations.
• TTL Threshold: A router forwards a multicast datagram if the TTL in the IP header is greater than the TTL threshold for the interface. This is used to limit the distance packets can travel.
• PIM: Protocol Independent Multicast. This is the type of routing protocol used.
• Querier: The designated multicast router that sends IGMP Host Membership queries.
• Leaf: Indicates that this router is on the edge of the network.