3com S7906E 설치 설명서

 

1-3 

Figure 1-3 IPv6 prefix RTE format 

IPv6 prefix (16 octets)

Route tag

Prefix length

Metric

0

7

15

31

 

 

z 

IPv6 prefix: Destination IPv6 address prefix. 

z 

Route tag: Route tag. 

z 

Prefix len: Length of the IPv6 address prefix. 

z 

Metric: Cost of a route. 

When a RIPng router first starts or needs to update some entries in its routing table, generally a 

multicast request packet is sent to ask for needed routes from neighbors. 

The receiving RIPng router processes RTEs in the request. If there is only one RTE with the IPv6 prefix 

and prefix length both being 0, and with a metric value of 16, the RIPng router will respond with the 

entire routing table information in response messages. If there are multiple RTEs in the request 

message, the RIPng router will examine each RTE, update its metric, and send the requested routing 

information to the requesting router in the response packet. 

The response packet containing the local routing table information is generated as: 

z 

A response to a request 

z 

An update periodically 

z 

A trigged update caused by route change 

After receiving a response, a router checks the validity of the response before adding the route to its 

routing table, such as whether the source IPv6 address is the link-local address and whether the port 

number is correct. The response packet that failed the check will be discarded. 

z 

RFC 2080: RIPng for IPv6 

z 

RFC 2081: RIPng Protocol Applicability Statement 

This section presents the information to configure the basic RIPng features. 

You need to enable RIPng first before configuring other tasks, but it is not necessary for RIPng related 

interface configurations, such as assigning an IPv6 address. 

Before the configuration, accomplish the following tasks first: 

z 

Enable IPv6 packet forwarding.