Asante Technologies 35516 - Manual (Page 55)

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Connected interface 0
Static route 1
External BGP 20
OSPF 110
RIP 120
Internal BGP 200
Unknown 255
Table 5-3: Dynamic Routing Protocol Default Administrative Distances
5.4 Configuring RIP
The Routing Information Protocol (RIP) is a commonly used interior gateway protocol (IGP) created for use in small,
homogeneous networks. It is a distance-vector routing protocol, documented in RFC 1058.
RIP uses broadcast User Datagram Protocol (UDP) data packets to exchange routing information. The IC35516
sends, or advertises, routing information updates every 30 seconds. If a router does not receive an update from
another router for 180 seconds or more, it will mark the routes served by the non-updating router as being unusable.
If there is still no update after another 120 seconds, the router will remove all routing table entries for the non-
updating router.
RIP uses the metric hop count to rate the value of different routes. The hop count is the number of routers that can be
traversed in a route. A directly connected network has a metric of zero; an unreachable network has a metric of 16.
This makes RIP an unsuitable routing protocol for large networks with many routers.
A router that is running RIP can receive a default network via an update from another router that is running RIP, or
the router can source the default network itself with RIP. In both cases, the default network is advertised to other RIP
neighbors. RIP sends updates to the interfaces in the specified networks. If an interface's network is not specified, it
will not be advertised in any RIP update. The IC35516 supports RIP Version 2.
5.4.1 Enable RIP
RIP must be enabled before carrying out any other of the RIP commands. To enter router configuration mode for RIP,
start in global configuration mode and enter the following command(s):
Router(config)# router rip
Router(config-rip-router)#
The network command enables RIP interfaces between certain numbers of a special network address. For example,
if the network for 10.0.0.0/24 is RIP enabled, this would result in all the addresses from 10.0.0.0 to 10.0.0.255 being
enabled for RIP.
Command Purpose
router rip Enable a RIP routing process, which places you in router
configuration mode.