topic Re: Memory usage or limitation to max number of flows in Application Networking

Memory usage or limitation to max number of flows

csco10260962 — Thu, 24 Mar 2005 13:35:00 GMT

Is there a limitation to the max number of flows in use before garbage-collection kicks in. We had a lot of trouble with disconnecting thin-clients to a serverfarm behind a css11501 (using loadbalancing based on sticky-srcip) after adding flow-timeout-multiplier 40 to content rules. The problems ceased, we have about 300 thinclients that could be connected at the same time to the farm. We will be expanding number of thin-clients to 500. And i want to know if there same problems will comeback or if i can increase the flow-timeout-multiplier futher without any problems.

See config below :

!************************** CIRCUIT **************************

circuit VLAN88

ip address 10.61.3.15 255.255.255.0

ip virtual-router 191

ip redundant-interface 191 10.61.3.16

circuit VLAN85

ip address 10.61.2.111 255.255.255.0

ip virtual-router 1

ip redundant-interface 1 10.61.2.113

ip redundant-vip 1 10.61.2.103

ip redundant-vip 1 10.61.2.105

!************************** SERVICE **************************

service sdvdbbts11

ip address 10.61.3.10

active

service sdvdbbts12

ip address 10.61.3.11

active

service sdvdbbts13

ip address 10.61.3.12

active

service sdvdbbts14

ip address 10.61.3.13

active

!*************************** OWNER ***************************

owner SDVDBBTSFH

content SDVDBBTSFH_RULE

flow-timeout-multiplier 40

add service sdvdbbts13

add service sdvdbbts14

vip address 10.61.2.103

advanced-balance sticky-srcip

sticky-inact-timeout 150

owner SDVDBBTSFHA

content SDVDBBTSFA_RULE

flow-timeout-multiplier 40

add service sdvdbbts11

add service sdvdbbts12

vip address 10.61.2.105

advanced-balance sticky-srcip

sticky-inact-timeout 150

Re: Memory usage or limitation to max number of flows

Gilles Dufour — Thu, 24 Mar 2005 16:55:14 GMT

look at 'flow stat' for number of free FCB.

The number of users does not really matters.

What is important is the number of connections.

Regards,

Gilles.

Re: Memory usage or limitation to max number of flows

csco10260962 — Wed, 30 Mar 2005 04:31:51 GMT

Hi Gilles,

Thankyou for the information. When i give command "flow statisitics".

I get following output :

flow statistics

----------------------------------------------------

AGGREGATE FLOW STATISTICS PER-SP

----------------------------------------------------

Flow Manager Statistics - Module 1

Cur High Avg

UDP Flows per second 0 30 0

TCP Flows per second 0 77 3

Total Flows per second 0 77 3

Hits per second 0 30 0

----------------------------------------------------

AGGREGATE FLOW STATISTICS PER-PORT

----------------------------------------------------

Port Active Total TCP UDP

----------------------------------------------------

#e1 53 8900748 49 4

#e8 51 8793167 47 4

I can't see the nummber of free FCBS the 11501 is running 7.10 Build 305 stnd.

Re: Memory usage or limitation to max number of flows

Gilles Dufour — Wed, 30 Mar 2005 13:16:53 GMT

you have to be in llama mode.