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IPV6 RIPNG CONFIGURATION
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■ The term “router” in this document refers to a Layer 3 switch running routing
protocols.
■ The Switch 4800G only support single RIPng process.
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 made the following changes to 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 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 after 180 seconds, the routes learned from the
neighbor are considered as unreachable. After 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.
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.
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