R0106-HP MSR Router Series Layer 3 - IP Routing Configuration Guide(V7)
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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 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
acknowledgement packets after sending an LSA to the neighbor, it retransmits the LSA.
To configure OSPF timers:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter interface
view.
interface interface-type
interface-number
N/A
3. Specify the hello
interval.
ospf timer hello seconds
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.
4. Specify the poll
interval.
ospf timer poll seconds
The default setting is 120 seconds.
The poll interval is at least four times the hello
interval.
5. Specify the dead
interval.
ospf timer dead seconds
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.
6. Specify the
retransmission
interval.
ospf timer retransmit interval
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.