Dvmrp Troubleshooting; Igmp; Introduction To Igmp - Accton Technology ES4710BD User Manual

DVMRP pruning debug is on
02:22:20:26: DVMRP: Received prune on vlan2 from 105.1.1.2, len 20
02:22:20:26: DVMRP: Prune Vers: majorv 3, minorv 255
02:22:20:26: DVMRP: Prune source 192.168.1.105, group 224.1.1.1
02:22:20:40: DVMRP: Received graft on vlan1 from 105.1.1.2, len 16
02:22:20:40: DVMRP: Graft Vers: majorv 3, minorv 255
02:22:20:40: DVMRP: Graft source 192.168.1.105, group 224.1.1.1
02:22:20:40: DVMRP: Send graft-ACK on vlan1 to 105.1.1.2, len 16
02:22:20:40: DVMRP: Graft-Ack Vers: majorv 3, minorv 255
02:22:20:40: DVMRP: Graft-ACK source 192.168.1.105, group 224.1.1.1
19.5.4.2

DVMRP Troubleshooting

In configuring and using DVMRP protocol, the DVMRP protocol may fail to run properly due to
reasons such as physical connection failure or wrong configurations. The user should ensure the
following:
Good condition of the physical connection.
All interface and link protocols are in the UP state (use "show interface" command).
Ensure the interface has an IP address properly configured (use "ip address" command).
Next, enable DVMRP on the interface (use the "ip dvmrp enable" command).
Multicast protocols use unicast routes to perform RPF check, for this reason, the unicast route
correctness must be ensured. (DVMRP uses its own unicast route table, use the "show ip
dvmrp route" command to view that table.)
If connectivity with CISCO is required, make sure the CISCO connex command is configured
(use "ip dvmrp cisco-compatible" command)
If DVMRP problems persist after the abovementioned procedures, please run debug commands like
"debug ip dvmrp detail/pruning", and copy the debug information in 3 minute and send the
information to Edge-Core technical service center.
19.6

IGMP

19.6.1 Introduction to IGMP

IGMP (Internet Group Management Protocol) is a TCP/IP protocol responsible for IP multicast
member management. It is used to establish and maintain multicast group membership between IP
hosts and direct neighbor multicast switches. IGMP does not include the populating and
maintenance of membership between multicast switches, which is covered by multicast routing
protocols. All hosts participate in multicast must implement IGMP.
Hosts participate in IP multicast can join/quit multicast groups at any position, any time, and of any
number. The multicast switches do not save all host memberships, which is also impractical. They
just obtain information about whether receivers of a multicast group (group member) exist in
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