The maximum datagram size is limited to bytes, not including the IP header. RIP sends its full routing table out all configured interfaces. The table is sent periodically as a broadcast The update timer specifies the frequency of the periodic broadcasts. By default, the update timer is set to 30 seconds. Each route has a timeout value associated with it. The timeout gets reset every time the router receives a routing update containing the route.
When the timeout value expires, the route is marked as unreachable because it is marked invalid. The router marks the route invalid by setting the metric to The route is retained in the routing table. A route entry marked as invalid is retained in the routing table until the flush timer expires. By default, the flush timer is seconds, which is 60 seconds longer than the invalid timer. Cisco implements an additional timer for RIP, the holddown timer. The holddown timer stabilizes routes by setting an allowed time for which routing information regarding different paths is suppressed.
After the metric for a route entry changes, the router accepts no updates for the route until the holddown timer expires. By default, the holddown timer is seconds. The output of the show ip protocol command, as shown in Example , shows the timers for RIP, unchanged from the defaults.
RIPv1 is limited to 15 hops; therefore, the network diameter cannot exceed this limit. RIPv1 also broadcasts its routing table every 30 seconds. RIPv1 is usually limited to accessing networks where it can interoperate with servers running routed or with non-Cisco routers. RIP also appears at the edge of larger networks. As shown in Figure , when you use RIPv1, all segments must have the same subnet mask.
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There is also no support for router authentication, making RIP vulnerable to various attacks. Being a classless routing protocol, means, it includes the subnet mask with the network addresses in its routing updates. Attention reader! Skip to content. Change Language. Related Articles.
In other words, if you have a subnetted network in your RIPv1 routing domain, RIPv1 will announce that network to other as unsubnetted network. Any router farther than 15 hops away is considered as unreachable. Since the updates are sent using the destination IP address of limited broadcast IP adddress RIPv2 is classless routing, which allows us to use subnetted networks also.
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