3Com SuperStack 4, Руководство по настройке

Страница: 110 / 432

122 C
HAPTER
6: IP R
OUTING
P
ROTOCOL
O
PERATION
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.
By default, the values of the period update and timeout timers are 30 seconds and
180 seconds respectively. The value of the garbage-collection timer is four times of
that of Period Update timer: 120 seconds.
In fact, you may find that the timeout time of the garbage-collection timer is not
fixed. If the period update timer is set to 30 seconds, the garbage-collection timer
might range from 90 to 120 seconds.
Table 115 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 116 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 } *