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OSPF Packet Pacing
Feature Summary
The former OSPF implementation for sending update packets needed to be more efficient. Some update packets were getting lost in cases where the link was slow, a neighbor could not receive the updates fast enough, or the router was out of buffer space. For example, packets might be dropped if either of these topologies existed:
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A fast router was connected to a slower router over a point-to-point link.
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OSPF update packets are now automatically paced by a delay of 33 milliseconds. Pacing is also added between retransmissions to increase efficiency and minimize lost retransmissions.
Benefit
OSPF update and retransmission packets are sent more efficiently. Also, you can display the link state advertisements (LSAs) waiting to be sent out an interface.
Platforms
This feature is supported on all platforms running Cisco IOS Release 12.0(1)T.
Configuration Task
There are no configuration tasks for this feature; it occurs automatically.
If you want to observe OSPF packet pacing by displaying a list of LSAs waiting to be flooded over a specified interface, use the following command in EXEC mode:
show ip ospf flood-list interface interface
Display a list of LSAs waiting to be flooded over an interface.
Command Reference
This section documents the new show ip ospf flood-list command.
show ip ospf flood-list
To display a list of OSPF link state advertisements (LSAs) waiting to be flooded over an interface, use the show ip ospf flood-list EXEC command.
show ip ospf flood-list interface type number
Syntax Description
Command Mode
EXEC
Usage Guidelines
This command first appeared in Cisco IOS Release 12.0(1)T.
Use this command to observe OSPF packet pacing.
Sample Display
The following is sample output of the show ip ospf flood-list command:
Router# show ip ospf flood-list interface ethernet 1Interface Ethernet1, Queue length 20Link state flooding due in 12 msecType LS ID ADV RTR Seq NO Age Checksum5 9.2.195.0 200.0.0.163 0x80000009 0 0xFB615 9.1.192.0 200.0.0.163 0x80000009 0 0x29385 9.2.194.0 200.0.0.163 0x80000009 0 0x7575 9.1.193.0 200.0.0.163 0x80000009 0 0x1E425 9.2.193.0 200.0.0.163 0x80000009 0 0x124D5 9.1.194.0 200.0.0.163 0x80000009 0 0x134Cdescribes the fields in the display.