Rip Message Format - HP MSR2000 series Configuration Manual

RIP message format

A RIP message consists of a header and up to 25 route entries. (A RIPv2 authentication message uses the
first route entry as the authentication entry, leaving 24 available.)
RIPv1 message format
Figure 6 RIPv1 message format
Command—Type of message. 1 indicates request, which is used to request all or part of the routing
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information from the neighbor; 2 indicates response, which contains all or part of the routing
information. A response message consists of up to 25 route entries.
Version—Version of RIP, 0x01 for RIPv1.
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Must be zero—This field must be zero
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• AFI—Address Family Identifier, 2 for IP.
IP address—Destination IP address of the route that can be a natural network, subnet, or a host
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address.
Metric—Cost of the route.
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RIPv2 message format
The format of RIPv2 message is similar to RIPv1.
Figure 7 RIPv2 Message Format
The differences between RIPv1 and RIPv2 messages are stated as follows:
• Version–Version of RIP. For RIPv2 the value is 0x02.
Route tag.
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IP address—Destination IP address. It can be a natural network address, subnet address, or host
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address.
• Subnet mask—Mask of the destination address. Unlike RIPv1, RIPv2 can carry subnet information.
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