3Com Switch 8800 Advanced Software V5 Configuration Guide

IPv6 OSPFv3 Configuration Task List 355
flooding scope. It was introduced because Router-LSAs and Network-LSAs
contain no address information now.
Timers of OSPFv3 Timers in OSPFv3 include:
■ OSPFv3 packet timer
■ LSA delay timer
■ SPF timer
OSPFv3 packet timer
Hello packets are sent periodically between neighboring routers for finding and
maintaining neighbor relationships, or for DR/BDR election. The hello interval must
be identical on neighboring interfaces. The smaller the hello interval, the faster the
network convergence speed and the bigger the network load.
If a router receives no hello packet from a neighbor after a period, it will declare
the peer is down. The period is called dead interval.
After sending an LSA to its adjacency, a router waits for an acknowledgment from
the adjacency. If no response is received after retransmission interval elapses, the
router will send again the LSA. The retransmission interval must be longer than the
round-trip time of the LSA in between.
LSA delay time
Each LSA has an age in the local LSDB (incremented by 1 per second), but an LSA
is not aged on transmission. You need to add an LSA delay time into the age time
before transmission, which is important for low speed networks.
SPF timer
Whenever LSDB changes, SPF recalculation happens. If recalculations become so
frequent, a large amount of resources will be occupied, reducing operation
efficiency of routers. You can adjust SPF calculation interval and delay time to
protect networks from being overloaded due to frequent changes.
OSPFv3 Features
Supported
■ Basic features defined in RFC2740
■ OSPFv3 stub area
■ OSPFv3 multi-process, which enable a router to run multiple OSPFv3 processes
Related RFCs ■ RFC2740: OSPF for IPv6
■ RFC2328: OSPF Version 2
IPv6 OSPFv3
Configuration Task
List
To configure OSPFv3, perform the tasks described in the following sections:
Task Description
“Configuring OSPFv3 Basic Functions” on page 356 Required
“Configuring OSPFv3 Area
Parameters” on page 357
“Configuring an OSPFv3 Stub
Area” on page 357
Optional
“Configuring OSPFv3 Virtual
Links” on page 357
Optional