432 CHAPTER 33: IPV6 RIPNG CONFIGURATION
■ Route time: Time that elapsed since a route entry is last changed. Each time a
route entry is modified, the routing time is set to 0.
■ Route tag: Identifies the route, used in routing policy to control routing
information.
RIPng Packet Format Basic format
A RIPng packet consists of a header and multiple route table entries (RTEs). The
maximum number of RTEs in a packet depends on the MTU of the sending
interface.
Figure 139 shows the packet format of RIPng.
Figure 139 RIPng basic packet format
■ Command: Type of message. 0x01 indicates Request, 0x02 indicates Response.
■ Version: Version of RIPng. It can only be 0x01 currently.
■ RTE: Route table entry, 20 bytes for each entry.
RTE format
There are two types of RTE in RIPng.
■ Next hop RTE: Defines the IPv6 address of a next hop
■ IPv6 prefix RTE: Describes the destination IPv6 address, route tag, prefix length
and metric in the RIPng routing table.
Figure 140 shows the format of the next hop RTE:
Figure 140 Next hop RTE format
IPv6 next hop address is the IPv6 address of the next hop.
Figure 141 shows the format of the IPv6 prefix RTE.
Ă
Command
Route table entry 1 (20 octets)
Version Must be zero
Route table entry n (20 octets)
0 7 15 31
IPv6 next hop address (16 octets)
Must be zero Must be zero 0xFF
0 7 15 31
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