TP-Link JetStream T2700G-28TQ User Manual page 182

information of natural networks such as Class A, B, and C. That is why RIPv1 does not support
discontinuous subnets.
RIPv2 is a classless routing protocol. Compared with RIPv1, RIPv2 has the following advantages.
Supporting route tags. Route tags are used in routing policies to flexibly control routes.
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Supporting masks, route summarization and Classless Inter-Domain Routing (CIDR).
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Supporting designated next hops to select the best next hops on broadcast networks.
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Supporting multicast routing update to reduce resource consumption.
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Supporting plain text authentication and MD5 authentication to enhance security.
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Note：
RIPv2 has two types of message transmission: broadcast and multicast. Multicast is the default
type using 224.0.0.9 as the multicast address. The interface working in the RIPv2 broadcast mode
can also receive RIPv1 messages.
RIP Message Format
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1) RIPv1 message format
An RIPv1 message consists of a header and up to 25 route entries. The following figure shows the
format of RIPv1 message.
The detailed explanations of each field are stated as following:
Command: Type of message. 1 indicates request, and 2 indicates response.
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Version: Version of RIP, 0x01 for RIPv1.
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AFI: Address Family Identifier, 2 for IP.
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IP Address: Destination IP address of the route. It can be a natural network, subnet or a
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host address.
Metric: Cost of the route.
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2) RIPv2 message format
The format of RIPv2 message is shown as the following figure. It is similar to RIPv1.
Figure 10-24 RIPv1 Message Format
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