Forum Discussion

smp_86112's avatar
smp_86112
Icon for Cirrostratus rankCirrostratus
Apr 19, 2011

Which is more efficient - switch or class statement?

We were evaluating a v10 rule today which sets a pool based on the client IP address: when HTTP_REQUEST { switch [IP::client_addr] { "10.15.102.126" - "10.15.101.14" - "10.11...
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Arie's avatar
Arie
Icon for Altostratus rankAltostratus
Apr 21, 2011
It depends on the number of items you're checking against. The rule of thumb is to use "switch" up to about a 100 items and a class for more than a 100 items.

 

 

However, this is from a performance perspective. One problem I've encountered with using switches is that iRules tend to apply only to new connections. In other words, updates to iRules do not affect existing clients. In my experience classes do not have this drawback.