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5.5.2 Configuring DVMRP
This section presents the commands for configuring DVMRP IP Multicast Routing Protocol. The following
commands are available from global configuration mode:
Router(config)# ip dvmrp ?
enable Enable DVMRP Multicast Routing Protocol
graft-retransmit-interval DVMRP graft message retransmitting interval
nbr-timeout DVMRP neighbor timeout value
probe-interval DVMRP Neighbor Probe message interval
prune-age DVMRP prune lifetime value in seconds
report-interval DVMRP report interval
route-discard-timeout DVMRP route discard timeout
route-expire-timeout DVMRP route expiration timeout
route-holddown-time DVMRP route holdown time
Router(config)# ip dvmrp
Important!
Remember that a
no
command (i.e
no ip dvmrp enable
) negates a previously entered
command.
Enabling DVMRP
In order to enable DVMRP protocol you must enter into the global configuration mode and then issue the
following global command.
Command Purpose
ip dvmrp enable
Enable a DVMRP IP Multicast routing process, which
places you in router configuration mode.
Graft-retransmit-interval
This value defines the interval of time that a DVMRP router sending a graft message will wait for a graft
acknowledgment from an upstream router before re-transmitting that message.
Subsequent re-transmissions will be sent at an interval of twice that of the preceding interval.
DVMRP must be enabled on the router for this command to be operational.
Command Purpose
graft-retransmit-interval <5–3600 seconds>
Defines the initial period of time that a
DVMRP router sending a graft message.
Default value:
10 seconds
Nbr-timeout
This value sets the neighbor timeout value, which is the period of time that a router will wait before it defines
an attached DVMRP neighbor router as down.
DVMRP must be enabled on the router for this command to be operational.
Command Purpose
nbr-timeout <35–8000 seconds>
Sets neighbor timeout value.
Default value: 40 seconds
Probe-interval
This value defines how often neighbor probe messages are sent to the ALL-DVMRP-ROUTERS IP multicast
group address.
A router’s probe message lists those neighbor DVMRP routers from which it has received probes.