• Source Network/Mask — source maskExample of the mtrace Command to View the Network PathThe following is an example of tracing a multicast route.R1>mtrace 103.103.103.3 1.1.1.1 226.0.0.3Type Ctrl-C to abort.Querying reverse path for source 103.103.103.3 to destination 1.1.1.1 via group 226.0.0.3From source (?) to destination (?)-----------------------------------------------------------------|Hop| OIF IP |Proto| Forwarding Code |Source Network/Mask|-----------------------------------------------------------------0 1.1.1.1 --> Destination-1 1.1.1.1 PIM Reached RP/Core 103.103.103.0/24-2 101.101.101.102 PIM - 103.103.103.0/24-3 2.2.2.1 PIM - 103.103.103.0/24-4 103.103.103.3 --> Source------------------------------------------------------------------The following table explains the output of the mtrace command:Table 64. mtrace Command Output — ExplainedCommand Output DescriptionQuerying reverse path for source103.103.103.3 to destination 1.1.1.1 viagroup 226.0.0.3mtrace traverses the reverse path from the given destination to the givensource for the given groupFrom source (?) to destination (?) In case the provided source or destination IP can be resolved to a hostnamethe corresponding name will be displayed. In cases where the IP cannot beresolved, it is displayed as (?)0 1.1.1.1 --> Destination The first row in the table corresponds to the destination provided by theuser.-1 1.1.1.1 PIM Reached RP/Core103.103.103.0/24The information in each of the response blocks is displayed as follows:• o (-1) Hop count is always a negative number to indicate reverse path• o (1.1.1.1) Outgoing interface address at that node for the source andgroup• o (PIM) Multicast protocol used at the node to retrieve the information• o (Reached RP/Core) Forwarding code in mtrace to denote that RPnode is reached• o (103.103.103.0/24) Source network and mask. In case (*G) tree isused, this field will have the value as (shared tree). In case no value isnoted in the record or in case of error like No Route or Wrong Last Hopthe value (default) will be displayed-4 103.103.103.3 --> Source The last line in the table corresponds to the source address provided by theuser.Supported Error CodesError codes denote problems in the network that has caused the mtrace query to fail.These codes not only provide error information but also provide general information such as RP node reachability information.602 Multicast Features
