Note Up to 25 occurrences of the AFI, address, and metric fields are permitted in a single IP RIP packet. Figure 44-2 shows the IP RIP 2 packet format. An IP RIP 2 packet consists of fields similar to those of an IP RIP packet. The request asks that a router send all or a part of its routing table. The response can be an unsolicited regular routing update or a reply to a request.
Responses contain routing-table entries.
Multiple RIP packets are used to convey information from large routing tables. In a RIP packet implementing any of the RIP 2 fields or using authentication, this value is set to 2. RIP is designed to carry routing information for several different protocols. Each entry has an address-family identifier to indicate the type of address specified. The address-family identifier for IP is 2.