Cisco Nexus 3548 User Manual

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Cisco Nexus 3548 Switch NX-OS Unicast Routing Command Reference
OL-27852-01
Chapter Unicast Routing Commands
timers lsa-group-pacing (OSPF)
timers lsa-group-pacing (OSPF)
To change the interval at which Open Shortest Path First (OSPF) link-state advertisements (LSAs) are
collected into a group and refreshed, checksummed, or aged, use the timers lsa-group-pacing
command. To return to the default, use the no form of this command.
timers lsa-group-pacing seconds
no timers lsa-group-pacing
Syntax Description
Command Default The default interval for this command is 240 seconds. OSPF LSA group pacing is enabled by default.
Command Modes Router configuration mode
VRF configuration mode
Command History
Usage Guidelines Use this command to control the rate at which LSA updates occur and reduce the high CPU or buffer
utilization that can occur when an area is flooded with a very large number of LSAs. The default settings
for OSPF packet pacing timers are suitable for the majority of OSPF deployments. Do not change the
packet pacing timers unless you have tried all other options to meet OSPF packet flooding requirements.
You should try summarization, stub area usage, queue tuning, and buffer tuning before changing the
default flooding timers. There are no guidelines for changing timer values; each OSPF deployment is
unique and should be considered on a case-by-case basis.
Cisco NX-OS groups the periodic refresh of LSAs to improve the LSA packing density for the refreshes
in large topologies. The group timer controls the interval used for group refreshment of LSAs; however,
this timer does not change the frequency that individual LSAs are refreshed (the default refresh rate is
every 30 minutes).
The duration of the LSA group pacing is inversely proportional to the number of LSAs that the router is
handling. For example, if you have about 10,000 LSAs, you should decrease the pacing interval. If you
have a very small database (40 to 100 LSAs), you should increase the pacing interval to 10 to 20 minutes.
This command requires the LAN Enterprise Services license.
Examples This example shows how to configure OSPF group packet-pacing updates between LSA groups to occur
in 60-second intervals for OSPF routing process 1:
switch# configure terminal
switch(config)# router ospf 1
seconds Time (in seconds) in the interval in which LSAs are grouped and refreshed,
checksummed, or aged. The range is from 1 to 1800 seconds. The default value
is 240 seconds.
Release Modification
5.0(3)A1(1) This command was introduced.

Cisco Nexus 3548 Specifications

General

Rack Units	1RU
Product Type	Switch
Form Factor	Rack-mountable
Jumbo Frame Support	9216 bytes
Input Voltage	100-240 VAC
Product Series	Nexus 3000
Model	Nexus 3548
Operating System	Cisco NX-OS
Ports	48 x 10GE SFP+
Latency	190 ns
Airflow	Front-to-back

Summary

New and Changed Information

Preface

Describes audience, organization, and conventions of the document.

Document Conventions

Explains conventions used in command descriptions and screen examples.

Related Documentation

Lists other Cisco documentation for related products.

Unicast Routing Commands

additional-paths receive

Enables BGP additional paths for a prefix to be received from a capable peer.

address-family (BGP neighbor)

Enters neighbor address family mode for configuring BGP routing protocols.

area authentication (OSPF)

Enables authentication for an Open Shortest Path First (OSPF) area.

aggregate-address (BGP)

Creates a summary address in a Border Gateway Protocol (BGP) routing table.

authentication (HSRP)

Configures authentication for the Hot Standby Router Protocol (HSRP).

distance (EIGRP)

Sets administrative distances for EIGRP internal and external routes.

redistribute (BGP)

Injects routes from one routing domain into the Border Gateway Protocol (BGP).

router bgp

Assigns an autonomous system (AS) number and enters BGP configuration mode.

neighbor

Configures a Border Gateway Protocol (BGP) neighbor and enters configuration mode.

Unicast Routing Show Commands

show bgp

Displays Border Gateway Protocol (BGP) routes.

show ip eigrp neighbors

Displays information about neighbors discovered by EIGRP.

show ip ospf neighbors

Displays Open Shortest Path First (OSPF)-neighbor information on a per-interface basis.

show ip route

Displays routes from the unicast Routing Information Base (RIB).

show running-config

Displays the running configuration.

show vrrp

Shows information about the Virtual Router Redundancy Protocol (VRRP).