3Com Switch 8800 Advanced Software V5 Configuration Guide

272 CHAPTER 28: RIP CONFIGURATION
■ IP Address: Destination IP address of the route; can be a natural network,
subnet or a host address.
■ Metric: Cost of the route.
RIP-2 message format
The format of RIP-2 message is similar with RIP-1. Figure 75 shows it.
Figure 75 RIP-2 Message Format
The differences from RIP-1 are stated as following.
■ Version: Version of RIP. For RIP-2 the value is 0x02.
■ Route Tag: Route Tag.
■ IP Address: Destination IP address. It could 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 that the originator of
the route.
RIP-2 authentication
RIP-2 sets the AFI field of the first route entry to 0xFFFF to identify authentication
information. See
Figure 76.
Figure 76 RIP-2 Authentication Message
■ Authentication Type: 2 represents plain text authentication, while 3 represents
MD5.
■ Authentication: Authentication data, including password information when
plain text authentication is adopted or including key ID, MD5 authentication
data length and sequence number when MD5 authentication is adopted.
Command
AFI
IP address
Version Unused
Subnet mask
Next hop
Route tag
Metric
0 7 15 31
Route
Entries
Header
Command
0xFFFF
Authentication (16 octets)
Version Unused
Authentication type
0715 31