Dell PowerSwitch S4820T Configuration Guide for the S4820T System 9.112.0P1 - Page 589
mtrace Scenarios
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The response data block filled in by the last-hop router contains a Forwarding code field. Forwarding code can be added at any node and is not restricted to the last hop router. This field is used to record error codes before forwarding the response to the next neighbor in the path towards the source. In a response data packet, the following error codes are supported: Table 65. Supported Error Codes Error Code 0x00 0x01 Error Name NO_ERROR WRONG_IF 0x05 NO_ROUTE 0x06 0x08 0x09 0x0A 0x81 WRONG_LAST_HOP REACHED_RP RPF_IF NO_MULTICAST NO_SPACE mtrace Scenarios Description No error Traceroute request arrived on the wrong interface. The router does not use this interface to forward packets to the source, group, and destination. The router has no route for the source or group and cannot determine a potential route. The router is not the proper last-hop router. Reached Rendezvous Point or Core. Traceroute request arrived on the expected RPF interface for this source and group. Traceroute request arrived on an interface which is not enabled for multicast. There is not enough room to insert another response data block in the packet. This section describes various scenarios that may result when an mtrace command is issued. The following table describes various scenarios when the mtrace command is issued: Table 66. Mtrace Scenarios Scenario When you want to trace a route with the multicast tree for a source, group, and destination, you can specify all the parameters in the command. Mtrace will trace the complete path from source to destination by using the multicast tables for that group. Output 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| 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 Multicast Features 589
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