Alcatel Carrier Internetworking Solutions 6624, 6648, 6800, 8800

Troubleshooting PIM-SM Register

OmniSwitch Troubleshooting Guide September 2005 page 16-21

When a source starts transmitting to a multicast group, the DR on the segment encapsulates the data and

sends it as unicast to the RP representing the group. The source IP address will be the DR and the destina-

tion IP address will be the RP. Two behaviors are possible:

1-The RP joins the source tree by sending a PIM join to the DR. Packets will then flow from the source to

the RP unencapsulated.

2-The RP does not join the source tree. The multicast packets will be encapsulated by the DR and send to

the unicast address of the RP.

Upon reception of the multicast stream, the RP forwards the packets unencapsulated to receivers if any. If

there are no receivers the RP issues a REGISTER STOP message to the source.

Com3Com3Com3

Com3

192.168.13.1

192.168.11.1

192.168.11.2

192.168.12.2

192.168.12.1

BSR

RP for 225.1.1.1

192.168.13.101

SOURCE

225.1.1.1