Filter
Top Products
Troubleshooting DVMRP DVMRP Troubleshooting
OmniSwitch Troubleshooting Guide September 2005 page 15-3
Route Timeout = 140,
Number of Routes = 6,
Number of Reachable Routes = 6
-> show ip dvmrp interface
Address Vlan Tunnel Metric Admin-Status Oper-Status
-----------------+------+--------+--------+---------------+-------------
192.168.10.1 1 No 1 Enabled Enabled
192.168.11.1 2 No 1 Enabled Enabled
192.168.12.1 3 No 1 Enabled Enabled
If an interface is not enabled then no multicast traffic will be routed to that VLAN the Interface represents.
What if everything is enabled in this switch correctly? It could be another switches problem or this switch
may be unable to process the messages correctly. Now see if you are seeing all the correct neighbors with
the following command.
-> show ip dvmrp neighbor
Neighbor Address Vlan Uptime Expires GenID Version State
----------------+------+-----------+-----------+-----------+---------+-------
192.168.12.3 3 00h:24m:19s 00h:00m:31s 1024473904 3.8 active
192.168.11.2 2 00h:23m:40s 00h:00m:35s 760301 3.255 active
If a neighbor is missing then it is likely that DVMRP does not recognize that device as a DVMRP neigh-
bor. Here is the way to see the multicast routing information.
-> show ip dvmrp route
Legends: Flags: L = Local, R = Remote, F = Flash, H = Holddown, I = Invalid
Address/Mask Gateway Metric Age Expires Flags
-------------------+------------------+------+-----------+---------+-----
192.168.10.0/24 - 1 00h:27m:13s - L
192.168.11.0/24 - 1 00h:27m:13s - L
192.168.12.0/24 - 1 00h:27m:13s - L
192.168.13.0/24 192.168.11.2 2 00h:25m:17s 02m:03s R
192.168.14.0/24 192.168.12.3 2 00h:24m:49s 01m:45s R
192.168.15.0/24 192.168.12.3 2 00h:24m:49s 01m:45s R
The above commands are made easier if you have a detailed diagram. Using the diagram you can know
you Multicast VLANS and where they can be seen from any switch in the network. Local routes will not
be seen if the IP interface is not enabled in the switch or in DVMRP. If you see this, make sure the inter-
face is enabled with the following commands.
-> show ip dvmrp interface
Address Vlan Tunnel Metric Admin-Status Oper-Status
-----------------+------+--------+--------+---------------+-------------
192.168.10.1 1 No 1 Disabled Disabled
192.168.11.1 2 No 1 Enabled Enabled
192.168.12.1 3 No 1 Enabled Enabled
-> ip dvmrp interface 192.168.10.1
-> show ip dvmrp interface
Address Vlan Tunnel Metric Admin-Status Oper-Status
-----------------+------+--------+--------+---------------+-------------