Microsoft KB Archive/225158

= Description of the Mrinfo.exe Tool for Command-Line Access to Multicast Routing =

Article ID: 225158

Article Last Modified on 2/23/2007

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APPLIES TO


 * Microsoft Windows 2000 Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Professional Edition
 * Microsoft Windows 2000 Datacenter Server

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This article was previously published under Q225158



SUMMARY
Mrinfo.exe is the only multicast command-line tool included with Windows 2000. You can use this tool to query a multicast router for information about its interfaces and neighbors.



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

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.

Keywords: kbinfo KB225158

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