Rip Initialization And Running Procedure; Rip Configuration Task List - H3C S7500 Series Operation Manual

Operation Manual – Routing Protocol
H3C S7500 Series Ethernet Switches
Route tag: Identifies whether a route is of internal routing protocol or external
routing protocol.
III. RIP timers
As defined in RFC 1058, RIP employs three timers: Period update, Timeout, and
Garbage-collection.
Period update timer: This timer is used to periodically trigger routing information
update so that the router can send all RIP routes to all the neighbors.
Timeout timer: If a RIP route is not updated (that is, the switch does not receive
any routing update from the neighbor) within the timeout time of this timer, the
route is considered unreachable.
Garbage-collection timer: An unreachable route will be completely deleted from
the routing table if no update for the route is received from the neighbor before
this timer times out.

3.1.2 RIP Initialization and Running Procedure

The RIP initialization and running procedure is described as follow:
Once RIP is enabled on a router, the router broadcasts or multicasts requests to
its neighbors. Upon receiving the packet, each neighbor running RIP returns
responses containing its routing table information.
When this router receives the responses, it updates its local routing table and
sends triggered updates to the neighbor. Upon receiving the triggered updates,
the neighbor sends the triggered updates to all its neighbors. After a series of
update triggering processes, each router can get and keep the updated routing
information.
By default, RIP sends its routing table information to its neighbors every 30
seconds. Upon receiving the packets, the neighbors maintain their own routing
tables and select optimal routes, and then advertise update information to their
respective neighbors so as to make the updated routes known globally.
Furthermore, RIP uses the timeout mechanism to handle the timeout routes so
as to ensure real-time and valid routes.
RIP is commonly used by most IP router suppliers. It can be used in most campus
networks and the regional networks that are simple and less dispersive. For larger
and more complicated networks, RIP is not recommended.

3.2 RIP Configuration Task List

Complete the following tasks to configure RIP:
3-2
Chapter 3 RIP Configuration