Configuring Ospf Timers; Specifying Lsa Transmission Delay - HP 6125XLG Configuration Manual

Configuring OSPF timers

An OSPF interface includes the following timers:
• Hello timer—Interval for sending hello packets. It must be identical on OSPF neighbors.
• Poll timer—Interval for sending hello packets to a neighbor that is down on the NBMA network.
• Dead timer—Interval within which if the interface receives no hello packet from the neighbor, it
declares the neighbor is down.
• LSA retransmission timer—Interval within which if the interface receives no acknowledgement
packets after sending a LSA to the neighbor, it retransmits the LSA.
To configure OSPF timers:
Step
1. Enter system view.
Enter interface
2.
view.
3. Specify the hello
interval.
4. Specify the poll
interval.
5. Specify the dead
interval.
6. Specify the
retransmission
interval.

Specifying LSA transmission delay

To avoid LSAs from aging out during transmission, set an LSA retransmission delay especially for low
speed links.
Command
system-view
interface interface-type
interface-number
ospf timer hello seconds
ospf timer poll seconds
ospf timer dead seconds
ospf timer retransmit interval
68
Remarks
N/A
N/A
By default:
•
The hello interval on P2P and broadcast
interfaces is 10 seconds.
•
The hello interval on P2MP and NBMA
interfaces is 30 seconds.
The default hello interval is restored when the
network type for an interface is changed.
The default setting is 120 seconds.
The poll interval is at least four times the hello
interval.
By default:
•
The dead interval on P2P and broadcast
interfaces is 40 seconds.
•
The dead interval on P2MP and NBMA
interfaces is 120 seconds.
The dead interval must be at least four times the
hello interval on an interface.
The default dead interval is restored when the
network type for an interface is changed.
The default setting is 5 seconds.
A retransmission interval setting that is too small
can cause unnecessary LSA retransmissions.
This interval is typically set bigger than the
round-trip time of a packet between two
neighbors.