Tuning And Optimizing Ospf Networks; Configuration Prerequisites; Configuring Ospf Timers - HP 6125XLG Layer 3 - Ip Routing Configuration Manual

Tuning and optimizing OSPF networks

You can use one of the following methods to optimize an OSPF network:
• Change OSPF packet timers to adjust the convergence speed and network load. On low-speed
links, consider the delay time for sending LSAs.
Change the SPF calculation interval to reduce resource consumption caused by frequent network
•
changes.
Configure OSPF authentication to improve security.
•

Configuration prerequisites

Before you configure OSPF network optimization, complete the following tasks:
Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
• Enable OSPF.

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.
2. Enter interface
view.
3. Specify the hello
interval.
4. Specify the poll
interval.
Command
system-view
interface interface-type
interface-number
ospf timer hello seconds
ospf timer poll seconds
80
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.