Operation Manual – IPv6 Routing
H3C S3610&S5510 Series Ethernet Switches
Chapter 2 IPv6 RIPng Configuration
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Chapter 2 IPv6 RIPng Configuration
Note:
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The term “router” in this document refers to a Layer 3 switch running routing
protocols.
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Verify that the system already operates in IPv4/IPv6 dual-stack mode before
configuring IPv6 routing.
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All the IPv6 routing related configuration mentioned in this manual assumes that the
system already operates in IPv4/IPv6 dual-stack mode. For dual stack mode
configuration, see the part covering dual stack in the IPv6 Configuration module.
2.1 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:
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UDP port number: RIPng uses UDP port 521 for sending and receiving routing
information.
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Multicast address: RIPng uses FF02:9 as the link-local multicast address.
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Destination Prefix: 128-bit destination address prefix.
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Next hop: 128-bit IPv6 address.
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Source address: RIPng uses FE80::/10 as the link-local source address
2.1.1 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.
