Ripng Packet Format - H3C S3610-28P Operation Manual

Operation Manual – IPv6 Routing
H3C S3610&S5510 Series Ethernet Switches
RIPng supports Split Horizon and Poison Reverse to prevent routing loops, and route
redistribution.
Each RIPng router maintains a routing database, including route entries of all
reachable destinations. A route entry contains the following information:
Destination address: IPv6 address of a host or a network.
Next hop address: IPv6 address of a neighbor along the path to the destination.
Egress interface: Outbound interface that forwards IPv6 packets.
Metric: Cost from the local router to the destination.
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.

2.1.2 RIPng Packet Format

I. 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 2-1
Figure 2-1 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.
II. 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 2-2
shows the packet format of RIPng.
shows the format of the next hop RTE:
Chapter 2 IPv6 RIPng Configuration
2-2