Extreme Networks ExtremeWare 7.7, Command Reference Manual

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1832 ExtremeWare 7.7 Command Reference Guide
IGP Commands
configure ospf vlan <vlan name> timer
configure ospf vlan <vlan name> timer <retransmit interval> <transit delay>
<hello interval [1-655191]> <dead interval> {<wait timer interval>}
Description
Configures the OSPF timer intervals.
Syntax Description
Default
• retransmit interval—5 seconds.
• transit delay—1 second.
• hello interval—10 seconds.
• dead interval—40 seconds.
• wait timer interval—dead interval.
Usage Guidelines
Specify the following:
• retransmit interval—If you set an interval that is too short, unnecessary retransmissions will result.
• transit delay—The transit delay must be greater than 0.
• hello interval—Smaller times allow routers to discover each other more quickly, but also increase
network traffic.
• dead interval—This interval should be a multiple of the hello interval.
• wait timer interval—This interval is required by the OSPF standard to be equal to the router dead
interval. Under some circumstances, setting the wait interval to smaller values can help OSPF routers
on a broadcast network to synchronize more quickly at the expense of possibly electing an incorrect
DR or BDR. This value should not be set to less than the hello interval. The default value is equal to
the router dead interval.
Example
The following command configures the OSPF wait interval on the VLAN accounting :
configure ospf vlan accounting timer 10 15 20 60 60
vlan name Specifies a VLAN name.
retransmit interval Specifies the length of time that the router waits before retransmitting an LSA
that is not acknowledged.
transit delay Specifies the length of time it takes to transmit an LSA packet over the
interface.
hello interval Specifies the interval at which routers send hello packets.
dead interval Specifies the interval after which a neighboring router is declared down due to
the fact that hello packets are no longer received from the neighbor.
wait timer interval Specifies the interval between the interface coming up and the election of the
DR and BDR.