Operation Manual – IPv6 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 2 IPv6 RIPng Configuration
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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:
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Destination address: IPv6 address of a host or a network.
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Next hop address: IPv6 address of a neighbor along the path to the destination.
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Egress interface: Outbound interface that forwards IPv6 packets.
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Metric: Cost from the local router to the destination.
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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.
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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.
shows the packet format of RIPng.
Figure 2-1
RIPng basic packet format
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Command: Type of message. 0x01 indicates Request, 0x02 indicates Response.
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Version: Version of RIPng. It can only be 0x01 currently.
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RTE: Route table entry, 20 bytes for each entry.
II. RTE format
There are two types of RTE in RIPng.
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Next hop RTE: Defines the IPv6 address of a next hop
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IPv6 prefix RTE: Describes the destination IPv6 address, route tag, prefix length
and metric in the RIPng routing table.
shows the format of the next hop RTE: