Administration of the Avaya G350 Media Gateway - Avaya Support

Configuring the router●●●●Use the network command to specify a list of networks on which the RIP is running. Usethe no form of this command to remove an entry from the list of networks.Use the redistribute command to redistribute routing information from other protocolsinto RIP. Use the no form of this command to restore the default value, disableredistribution by RIP.Use the router rip command to enable RIP and to enter the router configurationcontext. Use the no form of this command to restore the default value, disabling RIP.Use the timers basic command to set RIP timers. Use the no form of this command toset the RIP timers to their default values.Configuring OSPFThis section provides information about configuring OSPF parameters for router interfaces andcontains the following topics:●●●●Overview of OSPF — an overview of OSPFOSPF dynamic cost — a description of OSPF cost calculation, with instructions on how tomanually configure the cost of an OSPF interfaceOSPF limitations — a description of the limitations on the use of OSPF on the G350OSPF commands — a list and descriptions of CLI commands used to configure OSPF onthe G350Overview of OSPFThe Open Shortest Path First (OSPF) protocol enables routers to compute the path that an IPpacket should follow. Routers exchange routing information with OSPF to determine where tosend each IP packet on its next hop. RIP is an older protocol that serves a similar purpose. Formore information about RIP, see RIP overview on page 190.OSPF is based on the shortest-path-first or link-state algorithm. It was introduced to overcomethe limitations of RIP in increasingly complex network designs. OSPF uses the cost of a path asthe criterion for comparing paths. In contrast, RIP uses the number of hops as the criterion forcomparing paths. Also, updates are sent when there is a topological change in the network,rather than every 30 seconds as with RIP.The advantage of shortest-path-first algorithms is that under stable conditions, there are lessfrequent updates (thereby saving bandwidth). They converge quickly, thus preventing suchproblems as routing loops and Count-to-Infinity, when routers continuously increment the hopcount to a particular network. These algorithms make a stable network. The disadvantage ofshortest-path-first algorithms is that they require a lot of CPU power and memory.194 Administration of the Avaya G350 Media Gateway