Distance-Vector Routing Protocols (RIP)
The distance-vector routing algorithm passes complete routing table contents to neighboring routers, which then combine the received routing table entries with their own routing tables to complete the router’s routing table. This is called routing by rumor, because a router receiving an update from a neighbor router believes the information about remote networks without actually finding out for itself. It’s possible to have a network that has multiple links to the same remote network, and if that’s the case, the administrative distance of each received update is checked first. If the AD is the same, the protocol will have to use other metrics to determine the best path to use to that remote network. RIP uses only hop count to determine the best path to a network. If RIP finds more than one link with the same hop count to the same remote network, it will automatically perform a round-robin load balancing. RIP can perform load balancing for up to six equal-cost links (four by default).
For avoiding routing Loops in (RIP)
RIP version 1 uses only class-ful routing, which means that all devices in the network must use the same subnet mask. This is because RIP version 1 doesn’t send updates with subnet-mask information in tow.
RIP version 2 provides something called prefix routing and does send subnet mask information with the route updates. This is called classless routing.
In the following sections, we will discuss the RIP timers and then RIP configuration.
Configuring RIP Routing
Corp # config t Corp (config) # router rip Corp (config-router) # network 10.0.0.0 R1 (config-router) # do show ip route
R2 # config t R2 (config) #router rip R2 (config-router) #network 10.0.0.0 R2 (config-router) #do show ip route
Verifying the RIP Routing Tables
R3#debug ip rip RIP protocol debugging is on R3#terminal monitor R3#undeug all
discusses the differences between RIPv1 and RIPv2.
|Distance vector||Distance vector|
|Maximum hop count of 15||Maximum hop count of 15|
|Broadcast based||Uses multicast 126.96.36.199|
|No support for VLSM||Supports VLSM networks|
|No authentication||Allows for MD5 authentication|
|No support for dis-contiguous||Supports dis-contiguous networks networks|
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