5000 Series Layer 2/3 Managed Data Center Switch CLI Reference Guide
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To adjust the rate at which OSPFv2 sends LS
Update packets, use the timers pacing flood command in
router OSPFv2 global configuration mode. OSPF distributes routing information in Link State
Advertisements (LSAs), which are bundled into Link State Update (LS Update) packets. To reduce the
likelihood of sending a neighbor more packets than it can buffer, OSPF rate limits the transmission of LS
Update packets. By default, OSPF sends up to 30 updates per second on each interface. Use this
command to adjust this packet rate.
Use the
no
command to revert LSA transmit pacing to the default rate.
timers pacing flood milliseconds
no timers pacing flood
Parameters
milliseconds
Average time between transmission of LS Update packets. The range is
5 ms to 100 ms.
Default
The default is 33 milliseconds.
Command Mode
OSPFv2 Router Config
7-161 timers pacing Isa-group
To adjust how OSPF groups LSAs for periodic refresh, use the timers pacing Isa-group command in
OSPFv2 Router Configuration mode. OSPF refreshes self-originated LSAs approximately once every 30
minutes. When OSPF refreshes LSAs, it considers all self-originated LSAs whose age is from 1800 to
1800 plus the pacing group size. Grouping LSAs for refresh allows OSPF to combine refreshed LSAs into
a minimal number of LS Update packets. Minimizing the number of Update packets makes LSA
distribution more efficient.
When OSPF originates a new or changed LSA, it selects a random refresh delay for the LSA. When the
refresh delay expires, OSPF refreshes the LSA. By selecting a random refresh delay, OSPF avoids
refreshing a large number of LSAs at one time, even if a large number of LSAs are originated at one time.
timers pacing lsa-group seconds
Parameters
seconds
Width of the window in which LSAs are refreshed. The range for the
pacing group window is from 10 to 1800 seconds.
Default
The default is 60 seconds.
