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destination, and route table is built based on this databas e. When a RIP layer3 switch sent route update
packets to its neighbor devices, the complete route table is included in the packets. Therefore, in a large
network, routing data to be trans ferred and processed for each layer3 switch is quite large, causing degraded
network performance.
Besides the above mentioned, RIP protocol allows route information discovered by the other routing protocols
to be introduced to the route table.
The operation of RIP protocol is shown below:
1． Enable RIP. The switch sends request packets to the neighbor layer3 switches by broadcasting;
on receiving the request, the neighbor devices reply with the packets containing their local
routing information.
2． The Layer3 switch modifies its local route table on receiving the reply packets and sends
triggered update packets to the neighbor devices to advertise route updat e information. On
receiving the triggered updat e packet, the neighbor lay3 switches send triggered updat e packets
to their neighbor lay3 switches. After a sequence of triggered update packet broadcast, all layer3
switches get and maintain the latest route information.
In addition, RIP layer3 switches will advertise its local route table to their neighbor devices every 30 seconds.
On receiving the packets, neighbor devices maintain their local route table, select the best route and advertise
the updated information to their own neighbor devices, so that the updat ed routes are globally valid. Moreover,
RIP uses a timeout mechanism for outdated route, that is, if a switch does not receive regular updat e packets
from a neighbor within a certain interval (invalid timer interval), it considers the rout e from that neighbor invalid,
after holding the rout e fro a certain interval (holddown timer interval), it will delete that route.
35.2 RIP Configuration Task List
1. Enable RIP (required)
(1) Enable/disable RIP module.
(2) Enable interface to send/rec eive RIP packets
2. Configure RIP protoc ol parameters (optional)
(1) Configure RIP sending mechanism
1) Configure specified RIP packets transmission address
2) Configure RIP interface broadcast
(2) Configure the RIP routing parameters
1) Configure rout e introduction (default rout e metric, configure routes of the other protocols to be
introduced in RIP )
2) Configure int erface authentication mode and password
3) Configure the route deviation
4) Configure and apply route filt er
5) Configure Split Horizon
(3) Configure other RIP protocol parameters
1) Configure the managing distance of RIP route
2) Configure the RIP route capacity limit in route table
3) Configure the RIP update, timeout, holddown and other timer.
4) Configure the receiving buffer size of RIP UDP
35-2
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