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Packet Captures

Auto-RP.cap 726 bytes

Submitted Sep 14, 2009

Routers 2 and 3 have been configured as candidate RPs, and multicast RP announcements to Router 1 is the RP. R1 sees the candidate RP announcements from R2 and R3, and designates R3 the RP because it has a higher IP address ( R1 multicasts the RP mapping to The capture is from the R1-R2 link.

Auto-RP Ethernet IP UDP

Packets: 9 Duration: 239s Downloads: 6365

IGMP_V1.cap 2.0 KB

Submitted Apr 2, 2012 by Emieeecy

All IGMP V1 requests : Query General, Join specific group


Packets: 27 Duration: 259s Downloads: 11785

IGMP_V2.cap 1.3 KB

Submitted Mar 27, 2012 by Emieeecy

All IGMP V2 requests : Query General, Query specfic group, Join specific group, leave specific group


Packets: 18 Duration: 133s Downloads: 16926

IGMPv2_query_and_report.cap 438 bytes

Submitted Sep 14, 2009

R1 issues IGMPv2 general membership queries to the segment every 60 seconds. A host replies to each query reporting it belongs to the multicast group

Ethernet IGMP IP

Packets: 6 Duration: 126s Downloads: 8804

MSDP.cap 4.1 KB

Submitted Sep 14, 2009

R2 and R3 become MSDP peers and exchange keepalives. A multicast source begins sending traffic to group, and R2 begins sending periodic source active messages to R3. Capture perspective is the R2-R3 link.

Ethernet IP MSDP TCP

Packets: 35 Duration: 391s Downloads: 6326

PIM-DM_pruning.cap 10.2 KB

Submitted Sep 14, 2009

The multicast source at begins sending traffic to the group, and PIM-DM floods the traffic down the tree. R4 has no group members, and prunes itself from the tree. R2 and R3 then realize they have no members, and each prunes itself from the tree. The capture shows R2 receiving the multicast traffic flooded from R1 and subsequently pruning itself every three minutes.

Ethernet IP PIM UDP

Packets: 38 Duration: 415s Downloads: 7053

PIM-SM_join_prune.cap 3.8 KB

Submitted Sep 14, 2009

A host on R4's subnet requests to join the group. R4 sends a PIMv2 join message up to the RP (R1). Subsequent join messages are sent every 30 seconds, until R4 determines it no longer has any interested hosts and sends a prune request (packet #45). PIMv1 RP-Reachable messages for the group are also visible from R1.

Ethernet IGMP IP PIM

Packets: 47 Duration: 473s Downloads: 11553

PIM_register_register-stop.cap 258 bytes

Submitted Sep 30, 2009 by pierky

Switch at receives an IGMP request for the group, encapsulates the original IGMP packet in a PIM Register and sends it to the RP at In packet #2 RP sends a Register-Stop to the switch.

Ethernet IP PIM

Packets: 2 Duration: n/a Downloads: 10950

PIMv2_bootstrap.cap 712 bytes

Submitted Sep 14, 2009

Router 1 is the BSR and routers 2 and 3 are candidate RPs with the default priority of 0. R1 collects the RP advertisement unicasts from R2 and R3 and combines them in a bootstrap multicast to all PIM routers. Capture perspective is the R1-R3 link.

Ethernet IP PIM

Packets: 8 Duration: 184s Downloads: 7346

PIMv2_hellos.cap 528 bytes

Submitted Sep 14, 2009

Routers 1 and 2 exchange PIMv2 hello packets.

Ethernet IP PIM

Packets: 6 Duration: 63s Downloads: 9271

TDP.cap 2.8 KB

Submitted Sep 14, 2009

P2 and PE2 exchange Tag Distribution Protocol hellos and form an adjacency over TCP port 711.


Packets: 33 Duration: 47s Downloads: 6408

mrinfo_query.cap 182 bytes

Submitted Sep 14, 2009

mrinfo is issued on R1. DVMRPv3 is used to query R2 for its multicast interfaces.


Packets: 2 Duration: n/a Downloads: 5638

mtrace.cap 238 bytes

Submitted Sep 14, 2009

mtrace is issued on R1 to trace the RPF path from R4's subnet to R1's subnet. The capture is taken on the R1-R3 link.

Ethernet IGMP IP

Packets: 2 Duration: n/a Downloads: 6169