Process Overview: Routing Protocol Configuration
Configuring DVMRP
13-66 Matrix E1 Series (1G58x-09 and 1H582-xx) Configuration Guide
Example
This example shows how to display DVMRP routing table entries. In this case, the routing table has
5 entries. The first entry shows that the source network 60.1.1.0/24 can be reached via next-hop
router 40.1.1.3. This route has a metric of 2. It has been in the DVMRP routing table for 1 hour, 24
minutes and 2 seconds and will expire in 2 minutes and 3 seconds. It supports flag messages for
verifying neighbors, pruning, generation ID and netmask in prunes and grafts (VPGN):
13.1.3.4 show ip mroute
Use this command to display the multicast forwarding cache table. Since the DVMRP routing table
is not aware of group membership, the DVMRP process builds a forwarding cache table based on
a combination of information. This information includes items from the multicast routing table,
such at the source network/mask and upstream neighbors. Other items used to build the forwarding
cache table are source groups, received pruned neighbors and VLANs, upstream and downstream
VLANs, and other information, The forwarding cache table represents the local router’s
understanding of the shortest path source-based delivery tree for each (source, group) pair.
Basically it is the source’s RPM (Reverse-Path Multicast) for that group.
show ip mroute
Matrix>Router#show ip dvmrp route
flag characters used:
-------------
V Neighbor is verified.
P Neighbor supports pruning.
G Neighbor supports generation ID.
N Neighbor supports netmask in prunes and grafts.
S Neighbor supports SNMP.
M Neighbor supports mtrace.
----------------
DVMRP Routing Table - 5 entries
60.1.1.0/24 [2] uptime: 1:24:2, expires: 0:2:3
via neighbor: 40.1.1.3 version: 3.255 flags: VPGN gen id:
0x336ff052 50.50.50.0/24 [2] uptime: 1:24:18, expires: 0:1:25
via neighbor: 30.1.1.1 version: 3.255 flags: VPGN gen id:
0xaa4ee1fa 40.40.40.0/24 [2] uptime: 1:24:2, expires: 0:2:3
via neighbor: 40.1.1.3 version: 3.255 flags: VPGN gen id:
0x336ff052 40.1.1.0/24 [1] uptime: 1:24:8, expires: 0:0:0
via: local
30.1.1.0/24 [1] uptime: 1:24:20, expires: 0:0:0
via: local