Chapter : Protocols Overview 5
Router User Guide
RFC Compliance The following table provides Alcatel’s OSPF RFC compliance information.
RIP
Routing Information Protocol (RIP) is an interior gateway protocol (IGP), i.e., it routes traffic within
a single autonomous system (AS). RIP uses a distance-vector algorithm with hop count as the metric
to determine the best route to a destination.
Update messages are sent at configured intervals and when changes occur in the network topology.
These messages are used by routers to update their routing tables to maintain currency with the state
of the network. When a router updates its routing table, it transmits update messages to other routers
in the network to enable them to update their routing tables.
The following list identifies architectural characteristics of RIP:
îš„ The network path is limited to 15 hops. A destination with a greater number of hops is
considered unreachable.
îš„ The time required to determine a next hop and bandwidth could be substantial in a large network.
îš„ A fixed metric is used to select routes. Only the best route with the lowest metric is maintained
for a specific destination.
The following features are incorporated into
Alcatel’ implementation of RIP:
îš„ RIP v1, v2, and v1 compatibility modes
îš„ Configurable timers
îš„ VLSM
îš„ Split-horizon and split-horizon with poison reverse
îš„ Clear text and MD5 authentication
îš„ Redistribution of connected, static, and OSPF routes
îš„ Inbound and outbound filtering policies
RFC Compliance The following table provides Alcatel’s RIP RFC compliance information.
Table 3 OSPF RFC Compliance
RFC Description
2328 OSPF version 2
1587 OSPF NSSA option
1850 OSPF Version 2 Management Information Base
Table 4 RIP RFC Compliance
RFC Description
1058 Routing Information Protocol
2453/STD0056 RIP Version 2
1724 RIP Version 2 MIB extension
2082 RIP-II MD5 Authentication
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