H3C S5800 Series Configuration Manual page 41

Figure 3-1 RIPv1 Message Format
Command: Type of message. 1 indicates request, which is used to request all or part of the
routing information from the neighbor, and 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.
Must be zero: This field must be zero.
AFI: Address Family Identifier, 2 for IP, and 0 for request messages.
IP Address: Destination IP address of the route. It can be a natural network, subnet or a host
address.
Metric: Cost of the route, 16 for request messages.
RIPv2 message format
The format of RIPv2 message is similar to RIPv1.
Figure 3-2 RIPv2 Message Format
The differences from RIPv1 are stated as following.
Version: Version of RIP. For RIPv2 the value is 0x02.
Route Tag: Route Tag.
IP Address: Destination IP address. It can be a natural network address, subnet address or host
address.
Subnet Mask: Mask of the destination address.
Next Hop: If set to 0.0.0.0, it indicates that the originator of the route is the best next hop;
otherwise it indicates a next hop better than the originator of the route.
RIPv2 authentication message format
RIPv2 sets the AFI field of the first route entry to 0xFFFF to identify authentication information. See
Figure 3-3.
Figure 3-2 shows it.
3-4