Show Ip Mroute - Dell S6100 Configuration Manual

7.5.1.0
7.4.1.0
Usage Information
Mtrace is an IGMP based protocol that provides a multicast trace route facility and is implemented according to
the IETF draft "A trace route facility for IP Multicast" (draft-fenner-traceroute-ipm-01.txt). Dell Networking OS
supports the Mtrace client and transit functionality.
As an Mtrace client, Dell Networking OS transmits Mtrace queries, receives, parses, and prints out the details in
the response packet received.
A transit or intermediate router, forwards mtrace requests to the RPF neighbor after appending its response block
to the packet. In case it is the first hop router, it sends a response.
As an Mtrace transit or intermediate router, Dell Networking OS returns the response to Mtrace queries. After
receiving the Mtrace request, Dell Networking OS computes the RPF neighbor for the source, fills in the request
and the forwards the request to the RPF neighbor.
Example
R1>mtrace 103.103.103.3 1.1.1.1 226.0.0.3
Type Ctrl-C to abort.
Querying reverse path for source 103.103.103.3 to destination 1.1.1.1 via
group 226.0.0.3
From source (?) to destination (?)
-----------------------------------------------------------------
|Hop|
-----------------------------------------------------------------
-1
-2
-3
-4
------------------------------------------------------------------
The mtrace command traverses the path of the response data block in the reverse direction of the multicast data
traffic. The mtrace command traverses the reverse path to the source from the destination. As a result, the tabular
output of the mtrace command displays the destination details in the first row, followed by the RPF router details
along the path in the consequent rows, and finally the source details in the last row. The tabular output contains
the following columns:
•
•
•
•
•

show ip mroute

View the multicast routing table.
Syntax show ip mroute [vrf vrf-name] [static | group-address [source-address] | count
| snooping [vlan vlan-id] [group-address [source-address]] | summary | vlt
[group-address [source-address] | count]
1022 Multicast
Expanded to support originator.
Expanded to support the intermediate (transit) router.
OIF IP |Proto| Forwarding Code |Source Network/Mask|
0 1.1.1.1
1.1.1.1
101.101.101.102
2.2.2.1
103.103.103.3
Hop — a hop number(counted negatively to indicate reverse-path)
OIF IP — outgoing interface address
Proto — multicast routing protocol
Forwarding code — error code as present in the response blocks
Source Network/Mask — source mask
--> Destination
PIM Reached RP/Core
PIM -
PIM -
--> Source
103.103.103.0/24
103.103.103.0/24
103.103.103.0/24