H3C Technologies H3C S12500 Series Switches - Manual (Page 324)

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After sending an LSA to its adjacency, a router waits for an acknowledgment from the adjacency. If no
response is received after the retransmission interval elapses, the router will send the LSA again. The
retransmission interval must be longer than the round-trip time of the LSA.
LSA delay timer
Each LSA has an age in the local link state database (LSDB) (incremented by one per second), but an LSA
does not age on transmission. You must add an LSA delay time into the age time before transmission,
which is important for low-speed networks.
SPF timer
Whenever the LSDB changes, an SPF calculation happens. If recalculations become frequent, a large
amount of resources will be occupied. You can adjust the SPF calculation interval and delay time to
protect networks from being overloaded due to frequent changes.
GR timer
If a failure to establish adjacencies occurs during a GR, the switch will be in the GR process for a long
time. To avoid such cases, configure the GR timer for the switch to exit the GR process when the timer
expires.
OSPFv3 features supported
• Basic features defined in RFC 5340
• OSPFv3 stub area
• OSPFv3 NSSA area
• OSPFv3 multiprocess
• VPN instances
• OSPFv3 GR
• BFD
Protocols and standards
• RFC 2328, OSPF Version 2
• RFC 5187, OSPFv3 Graceful Restart
• RFC 5340, OSPF for IPv6
OSPFv3 configuration task list
Task Remarks
Enabling OSPFv3 Required.
Configuring OSPFv3 area
parameters
Configuring an OSPFv3 stub area Optional.
Configuring an OSPFv3 NSSA area Optional.
Configuring an OSPFv3 virtual link Optional.
Configuring OSPFv3 network
types Configuring the OSPFv3 network type for an
interface
Optional.