Cisco Press book was used as reference for this Knowledge base
It’s obvious, that impact on load depends on following
parameters:
Number of configured
operations.
Number of probes.
Also, the version of engine is also very important. Engine
version 2 was introduced in IOS 12.2(11)T and later. And it really
does have influence on performance as well. Engine v2 has:
20% to 50% reduction in memory
consumption pr operation.
V2 is backwards compatible. It means, any v1 operation can
be achieved on v2 engine.
The following table illustrates the CPU impact. Cisco 7200VXR
NPE225 is taken as an example:
Number of operations per second
Engine I
IOS 12.2(8)T5
500 active jitter probes
Engine II
IOS 12.3(3)
2000 active jitter probes
4
1%
4%
20
1%
3%
40
15%
7%
60
35%
11%
IP SLA memory consumption for engine v1 and v2 is provided in
following table:
Operation
Engine I
IOS 12.2(8)T5
Engine II
IOS 12.3(3)
UDP jitter
< 24 KB
< 12 KB
UDP echo
< 19 KB
< 3.5 KB
ICMP echo
< 17 KB
< 3.2 KB
The following numbers bellow presents examples on different
load. The tests were performed on a Cisco 7200VXR/NPE-225
with IOS 12.2(8)T5.
