When you open a CMD prompt and type mrinfo.exe, you receive:
There was no address specified Usage: 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 destinationYou can use mrinfo.exe to query a multicast router for information about its interfaces and neighbors.
Example
mrinfo -i 172.16.174.66 172.16.172.1 172.16.172.1 (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.) \[1/0/pim\]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 in
the 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.
