H3C Technologies H3C S7500E Series Switches - Manual (Page 281)

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RIPng Configuration
When configuring RIPng, go to these sections for information you are interested in:
z Introduction to RIPng
z Configuring RIPng Basic Functions
z Configuring RIPng Route Control
z Tuning and Optimizing the RIPng Network
z Displaying and Maintaining RIPng
z RIPng Configuration Example
z The term “router” in this document refers to a router in a generic sense or a Layer 3 switch.
z EA cards (such as LSQ1GP12EA and LSQ1TGX1EA) do not support IPv6 features.
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:
z UDP port number: RIPng uses UDP port 521 for sending and receiving routing information.
z Multicast address: RIPng uses FF02:9 as the link-local-router multicast address.
z Destination Prefix: 128-bit destination address prefix.
z Next hop: 128-bit IPv6 address.
z 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.