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RIP 75
Perform the following configuration in RIP view.
The modification of RIP timers takes effect immediately.
By default, the values of period update and timeout timers are 30 seconds and
180 seconds. The value of garbage-collection timer is four times that of period
update timer, 120 seconds.
In fact, you may find that the timeout time of garbage-collection timer is not fixed.
If period update timer is set to 30 seconds, garbage-collection timer might range
from 90 to 120 seconds.
Before RIP completely deletes an unreachable route from the routing table, it
advertises the route by sending four update packets with route metric of 16, to let
all the neighbors knows that the route is unreachable. Routes do not always
become unreachable when a new period starts so the actual value of the
garbage-collection timer is 3 to 4 times the value of the period update timer.
You must consider network performance when adjusting RIP timers, and configure
all the routes that are running RIP, to avoid unnecessary traffic or network
oscillation.
Configuring RIP-1 Zero Field Check of the Interface Packet
According to the RFC1058, some fields in the RIP-1 packet must be 0. When an
interface version is set to RIP-1, the zero field check must be performed on the
packet. If the value in the zero field is not zero, processing is refused. There are no
zero fields in RIP-2 packets so configuring a zero field check is invalid for RIP-2.
Perform the following configurations in RIP view.
By default, RIP-1 performs zero field check on the packet.
Specifying the Operating State of the Interface
In the VLAN interface view, you can specify whether RIP update packets are sent
and received on the interface. In addition, you can specify whether an interface
sends or receives RIP update packets.
Table 10 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 } *
Table 11 Configuring Zero Field Check of the Interface Packet
Operation Command
Configure zero field check on the RIP-1 packet checkzero
Disable zero field check on the RIP-1 packet undo checkzero