Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 585

32 Routing Information Protocol c e s Routing Information Protocol is supported only on platforms: RIP is supported on the S-Series following the release of FTOS version 7.8.1.0, and on the C-Series with FTOS versions 7.6.1.0 and after. Routing Information Protocol (RIP) is based on a distance-vector algorithm, it tracks distances or hop counts to nearby routers when establishing network connections. • Protocol Overview on page 585 • Implementation Information on page 586 • Configuration Information on page 586 • RIP Configuration Example on page 594 RIP protocol standards are listed in the Appendix 47, Standards Compliance chapter. Protocol Overview RIP is the oldest interior gateway protocol. There are two versions of RIP: RIP version 1 (RIPv1) and RIP version 2 (RIPv2). These versions are documented in RFCs 1058 and 2453. RIPv1 RIPv1 learns where nodes in a network are located by automatically constructing a routing data table. The routing table is established after RIP sends out one or more broadcast signals to all adjacent nodes in a network. Hop counts of these signals are tracked and entered into the routing table, which defines where nodes in the network are located. The information that is used to update the routing table is sent as either a request or response message. In RIPv1, automatic updates to the routing table are performed as either one-time requests or periodic responses (every 30 seconds). RIP transports its responses or requests by means of UDP over port 520. RIP must receive regular routing updates to maintain a correct routing table. Response messages containing a router's full routing table are transmitted every 30 seconds. If a router does not send an update within a certain amount of time, the hop count to that route is changed to unreachable (a route hop metric of 16 hops). Another timer sets the amount of time before the unreachable routes are removed from the routing table. Routing Information Protocol | 585