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RIP 227
3Com does not recommend the use of this command, because the destination
address does not need to receive two copies of the same message at the same time.
Note that
peer should be restricted using the following commands: rip work, rip
output
, rip input and network.
Specifying the RIP Version
RIP has two versions, RIP-1 and RIP-2. You can specify the version of the RIP packet
used by the interface.
RIP-1 broadcasts the packets. RIP-2 can transmit packets by both broadcast and
multicast. By default, multicast is adopted for transmitting packets. In RIP-2, the
default multicast address is 224.0.0.9. The advantage of transmitting packets in
multicast mode is that the hosts in the same network that do not run RIP, do not
receive RIP broadcast packets. In addition, this mode prevents the hosts that are
running RIP-1 from incorrectly receiving and processing the routes with subnet masks
in RIP-2. When an interface is running RIP-2, it can also receive RIP-1 packets.
Perform the following configuration in Interface View.
By default, the interface receives and sends the RIP-1 packets. It transmits packets in
multicast mode when the interface RIP version is set to RIP-2.
Configuring RIP Timers
As stipulated in RFC1058, RIP is controlled by three timers: period update, timeout,
and garbage-collection:
■ Period update is triggered periodically to send all RIP routes to all neighbors.
■ If an RIP route has not been updated when the timeout timer expires, the route is
considered unreachable.
■ If the garbage-collection timer expires before the unreachable route is updated by
the update packets from the neighbors, the route will be deleted completely from
the routing table.
Modification of these timers can affect the convergence speed of RIP.
Perform the following configuration in RIP View.
The modification of RIP timers is validated immediately.
Table 205 Specifying RIP Version of the Interface
Operation Command
Specify the interface version as RIP-1 rip version 1
Specify the interface version as RIP-2 rip version 2 [ broadcast | multicast ]
Restore the default RIP version running
on the interface
undo rip version
Table 206 Configuring RIP timers
Operation Command
Configure RIP timers timers { update update_timer_length |
timeout timeout_timer_length } *
Restore the default settings of RIP undo timers { update | timeout } *