Huawei Quidway S6500 Series Operation Manual page 158

Operation Manual - Routing Protocol
Quidway S6500 Series Ethernet Switches
By default, the interface receives and sends the RIP-1 packets. It will transmit packets
in multicast mode when the interface RIP version is set to RIP-2.
3.2.5 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 the neighbors.
If an RIP route has not been updated when Timeout timer times out, that is, the
switch has not received update packets from the neighbors, the route will be
considered unreachable.
If the Garbage-collection timer times out 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.
Table 3-5 Configuring RIP timers
Configure RIP timers
Restore the default settings of RIP
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 of that of
Period Update timer: 120 seconds.
Generally, it is regarded that the value of Garbage-collection timer is fixed to 4 times of
that of
Garbage-collection timer. 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 route metric of 16, so
as to acknowledge all the neighbors that 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 3 to 4 times of that of Period Update timer.
Operation
Period Update timer.
Huawei Technologies Proprietary
timers { update update-timer-length |
timeout timeout-timer-length } *
undo timers { update | timeout } *
Adjusting Period
3-5
Chapter 3 RIP Configuration
Command
Update timer will affect