Question about the CSS behavior when using layer 3 sticky and sticky table

[snakayama]

Hi everyone,

I have a question about the CSS behavior when using layer 3 sticky and sticky table is full.

If I configure layer 3 sticky and specify the inactivity timeout as below, how does the CSS

handle subsequent needed sticky requests ?

advanced-balance sticky-srcip

sticky-inact-timeout 30

CSS document says that

----------

Note:

If you use the sticky-inact-timeout command to specify the inactivity timeout

period on a sticky connection, when the sticky table becomes full and none of

the entries have expired from the sticky table, the CSS rejects subsequent

needed sticky requests.

----------

My question is what is the next reaction by doing the CSS if the CSS is in the

following condition:

when the sticky table becomes full and none of the entries have expired from

the sticky table, the CSS rejects subsequent needed sticky requests

Does CSS just rejects/drops subsequent needed sticky requests ?

or

Does CSS does not stick subsequence requests to particular service but CSS forward

subsequence requests with round-robin basis ? which means if the sticky table is full,

the CSS just works round-robin load balancing fashion for subsequence requests ?

Your information would be appreciated.

Best regards,

[claeysg · Accepted solution]

Hello,

There is a good document explaining this on Cisco web site

http://www.cisco.com/en/US/products/hw/contnetw/ps789/products_tech_note09186a0080094b4b.shtml

It depends if the sticky-inact-timeout is used or not. If not, it's FIFO (the oldest entry in the sticky table is removed). If yes, the CSS will reject the next sticky request.

Rgds,

Gaetan

Rgds

Gaetan

[snakayama]

Hello,

Thank you very much for your information.

I understand in case of the sticky-inact-timeout is configured and the sticky table is full,

CSS will reject the next sticky request and not forward it.

Regards,