Patent ID: 8442047
Filing Date: 2013-05-14
Classification: H04L

Abstract:
1. A method for implementing switching between layer-2 multicast route tracing and layer-3 multicast route tracing, comprising: judging, by a query apparatus, whether to perform layer-2 multicast route tracing; adding, by the query apparatus, an IP option of layer-2 multicast route tracing into IGMP Tracert Query packet if layer-2 multicast route tracing needs to be performed; receiving, by a last-hop router, the IGMP Tracert Query packet; judging, by the last-hop router, whether the IGMP Tracert Query packet carries the IP option of layer-2 multicast route tracing; transmitting, by the last-hop router, the IGMP Tracert Query packet to a downstream layer-2 transparently if the packet carries the IP option; or sending an IGMP Tracert Requet packet to the upstream node if the IGMP Tracert Query packet carries no such IP option.