cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
581
Views
0
Helpful
2
Replies

FCB resource use and reuse

csbowser
Level 1
Level 1

Two questions.

1). If the CSS marks a flow for clean-up due to matching the idle timeout value, and then the flow becomes active again before it is reclaimed...what happens? Is the flow still subject to cleanup if the threshold is met (25% of available resources or something like that)?

2). The CSS grabs a bunch of memory at startup for FCB's..what about permanent flows (flow timeout multiplier set to 0)? I have a customer who wants at least 80 idle flows to not timeout, ever. I'm concerned that the amount of resources consumed or dedicated will be damaging - but the question is how much resources would 80 connections actually utilize? I realize that TCP flow uses two FCBs...so what does that equal in memory/processor/etc.?

2 Replies 2

Gilles Dufour
Cisco Employee
Cisco Employee

1/ a flow marked for clean-up will be cleaned up even if still active.

2/ use 'flow stat' to identify the number of free flows that are available on your CSS.

You can then determine the impact of your 80 permanent flows.

80 should not have a big impact as you should have more than 200k free flows with CSS11500

Regards,

Gilles.

Thanks Gilles.

Review Cisco Networking for a $25 gift card