Ospfv3 Features Supported; Protocols And Standards - HP 4800G Series Configuration Manual

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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

If a router receives no hello packet from a neighbor within a period, it will declare the peer is down. The

period is called the dead interval.

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 again the LSA. The

retransmission interval must be longer than the round-trip time of the LSA.

LSA delay time

Each LSA has an age in the local LSDB (incremented by 1 per second), but an LSA does not age on

transmission. You need to add an LSA delay time into the age time before transmission, which is

important for low-speed networks.

Whenever the LSDB changes, an SPF calculation happens. If recalculations become so 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.

If a failure to establish adjacencies occurs during a GR, the device will be in the GR process for a long

time. To avoid such cases, you can configure the GR timer for the device to exit the GR process when

the timer expires.

OSPFv3 Features Supported

Basic features defined in RFC2740

OSPFv3 stub area

RFC2740: OSPF for IPv6

RFC2328: OSPF Version 2

RFC 5187: OSPFv3 Graceful Restart

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