H3C S9500 Series Operation Manual page 514

Operation Manual – RIP
H3C S9500 Series Routing Switches
Configure RIP timers
Restore the default settings of RIP timers
The modification of RIP timers is validated immediately.
By default, the values of Period Update and Timeout timers are 30 seconds and 180
seconds respectively. 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 Period Update packets with a route metric of 16, so
as to acknowledge all the neighbors to which the route is unreachable. As routes
cannot always become unreachable at the point when a new period starts, the actual
value of Garbage-collection timer is three to four times that of Period Update timer.
Note:
You must consider network performance when adjusting RIP timers, and configure all
the routers that are running RIP, so as to avoid unnecessary traffic or network jitter.
1.2.13 Configuring RIP-1 Zero Field Check of the Interface Packet
According to the RFC1058, some fields in the RIP-1 packet must be 0, and they are
called zero fields. Therefore, when an interface version is set as RIP-1, the zero field
check should be performed on the packet. But if the value in the zero filed is not zero,
processing will be refused. As there is no zero field in the RIP-2 packet, this
configuration is invalid for RIP-2.
Perform the following configuration in RIP view to configure/disable zero field check of
the interface packet:
Configure zero field check on the RIP-1 packet
Disable zero field check on the RIP-1 packet
By default, RIP-1 performs zero field check on the packet.
To do...
To do...
1-10
Chapter 1 RIP Configuration
Use the command...
timers { update update-timer-length |
timeout timeout-timer-length } *
undo timers { update | timeout } *
Use the command...
checkzero
undo checkzero