Tuning And Optimizing Ospf Networks; Configuration Prerequisites; Setting Ospf Timers - HP FlexFabric 12900E Series 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, perform the following tasks:
•
Configure IP addresses for interfaces to ensure IP connectivity between neighboring nodes.
•
Enable OSPF.

Setting 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 does not receive any hello packet from the
neighbor, it declares the neighbor is down.
•
LSA retransmission timer—Interval within which if the interface does not receive any
acknowledgment packets after sending an LSA to the neighbor, it retransmits the LSA.
To set OSPF timers:
Step
1. Enter system view.
2. Enter interface view.
3. Set the hello interval.
4. Set the poll interval.
Command
system-view
interface interface-type
interface-number
ospf timer hello seconds
ospf timer poll seconds
84
Remarks
N/A
N/A
By default:
•
The hello interval on P2P and
broadcast interfaces
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 a minimum of four
times the hello interval.
is 10