JSI Tip 5627. Mrinfo.exe is the only multicast command-line tool included with Windows.

When you open a CMD prompt and type mrinfo.exe, you receive:

There was no address specifiedUsage: mrinfo [-n?] [-i address] [-t secs] [-r retries] destination -n           Display IP addresses in numeric format -i address   Address of local interface to send query out -t seconds   Timeout in seconds for IGMP queries (default = 3 seconds) -r retries   Number of extra times to send the SNMP queries (default = 0) -?           Print Usage destination  Address or name of destination

You can use mrinfo.exe to query a multicast router for information about its interfaces and neighbors.

Example

mrinfo -i 172.16.174.66 172.16.172.1172.16.172.1 (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]

The query is send out the 172.16.174.66 interface. 172.16.174.1 has two interfaces

The --> 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] is compose of the following elements:

Metric                  -  The cost of the link, used in routing calculations.

TTL Threshold  -  A router forwards a multicast datagram if the TTL inthe IP header
                               is greater than the TTL threshold for the interface.
                              This is used to limit the distance packets can travel.

PIM                    - This is the type of routing protocol used. Protocol Independent Multicast.

Querier             - The designated multicast router that sends IGMP Host Membership queries.

Leaf                  -  Indicates that this router is on the edge of the network.