Protocols Overview
June 2004 © 2004 Foundry Networks, Inc. 4 - 3
RFC Compliance
The following table provides Foundry Network’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 a s the metr ic to dete rmine the b est
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:
• The network path is limited to 15 hops. A destination with a greater number of hops is considered
unreachable.
• The time required to determine a next hop and bandwidth could be substantial in a large network.
• 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 Foundry’ implementation of RIP:
• RIP v1, v2, and v1 compatibility modes
• Configurable timers
•VLSM
• Split-horizon and split-horizon with poison reverse
• Clear text and MD5 authentication
• Redistribution of connected, static, and OSPF routes
• Inbound and outbound filtering policies
RFC Compliance
The following table provides Foundry Network’s RIP RFC compliance information.
Table 4.2: OSPF RFC Compliance
RFC Description
2328 OSPF version 2
1587 OSPF NSSA option
1850 OSPF Version 2 Management Information Base
Table 4.3: RIP RFC Compliance
RFC Description
1058 Routing Information Protocol
2453/
STD0056 RIP Version 2
1724 RIP Version 2 MIB extension