| RIP (Routing Information Protocol) is a distant | | | | Route update timer |
| vector routing protocol. RIP algorithm has been in | | | | Every 30 seconds, a Cisco router will send a RIP |
| use since the early days of ARPAnet. Currently, | | | | update out every interface that has a RIP |
| there are 2 versions of RIP, which are known as | | | | network attached to it. Each update contains the |
| Routing Information Protocol version 1 (RIPv1) and | | | | entire routing table of the sending router. When |
| Routing Information Protocol version 2 (RIPv2). | | | | another router on the network receives the |
| More information about RIPv1 can be found on | | | | update, it adds any new routes to its routing table |
| (RFC1058) and more information about RIPv2 can | | | | or will replace a route if the update has a lower |
| be found on (RFC 1723). RIPv1 supports only | | | | hop count for that route. |
| classful routing and RIPv2 uses classless routing. | | | | Route Invalid Timer |
| This means RIPv2 support Variable length Subnet | | | | Route invalid timer is 180 seconds. If router |
| Mask (VLSM). | | | | doesn’t receive any update about a particular |
| RIP is a UDP based protocol that uses port 520 | | | | router for that period, then router will find out |
| for all communication. RIP was designed for small | | | | that this route has become invalid. |
| to medium sized networks. RIP uses hop count as | | | | Route Flush Timer |
| a metric. RIP supports maximum 15 hops. The | | | | Sets the time between a route becoming invalid |
| maximum size of RIPv1 or RIP2 packet is 512 | | | | and its removal from therouting table (240 |
| octets. RIP has the administrative distance of 120. | | | | seconds). |