Ripng Configuration; Introduction To Ripng; Ripng Working Mechanism - 3Com 4500G Family Configuration Manual

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RIPng Configuration

When configuring RIPng, go to these sections for information you are interested in:

Introduction to RIPng

Configuring RIPng Basic Functions
Configuring RIPng Route Control
Tuning and Optimizing the RIPng Network
Displaying and Maintaining RIPng
RIPng Configuration Example
The term "router" in this document refers to a router in a generic sense or a Layer 3 switch.
Introduction to RIPng
RIP next generation (RIPng) is an extension of RIP-2 for IPv4. Most RIP concepts are applicable in
RIPng.
RIPng for IPv6 has the following basic differences from RIP:
UDP port number: RIPng uses UDP port 521 for sending and receiving routing information.
Multicast address: RIPng uses FF02:9 as the link-local-router multicast address.
Destination Prefix: 128-bit destination address prefix.
Next hop: 128-bit IPv6 address.
Source address: RIPng uses FE80::/10 as the link-local source address

RIPng Working Mechanism

RIPng is a routing protocol based on the distance vector (D-V) algorithm. RIPng uses UDP packets to
exchange routing information through port 521.
RIPng uses a hop count to measure the distance to a destination. The hop count is referred to as metric
or cost. The hop count from a router to a directly connected network is 0. The hop count between two
directly connected routers is 1. When the hop count is greater than or equal to 16, the destination
network or host is unreachable.
By default, the routing update is sent every 30 seconds. If the router receives no routing updates from a
neighbor within 180 seconds, the routes learned from the neighbor are considered as unreachable.
Within another 240 seconds, if no routing update is received, the router will remove these routes from
the routing table.
RIPng supports split horizon and poison reverse to prevent routing loops and route redistribution.
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