Rip Message Format - H3C S5500-EI Configuration Manual

Supports 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

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
0
Header
Route
Entries
7
Command Version
AFI
15
Must be zero
Route tag
IP address
Subnet mask
Next hop
Metric
23
31