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meena_60183's avatar
meena_60183
Icon for Nimbostratus rankNimbostratus
Oct 28, 2010

double entries in the persistence table

I have 2 entries for each source IP address on the persistence table.

 

 

I have a source_addr based persistence using an irule on a forwarding virtual server and have no idea why 2 entries get created. The timeout is set to 3600 seconds. Here is the sample

 

 

config b persist pool cf_clinic show all

 

PERSISTENT CONNECTIONS

 

| Mode source addr Value 10.27.243.207

 

| virtual any:any node 10.44.254.23 age 2074sec

 

| Mode source addr Value 10.27.243.210

 

| virtual any:any node 10.44.254.23 age 16sec

 

| Mode source addr Value 10.27.243.210

 

| virtual any:any node 10.44.254.23 age 21sec

 

| Mode source addr Value 10.27.240.2

 

| virtual any:any node 10.44.254.24 age 290sec

 

| Mode source addr Value 10.27.240.2

 

| virtual any:any node 10.44.254.24 age 46sec

 

| Mode source addr Value 10.27.243.211

 

| virtual any:any node 10.44.254.24 age 412sec

 

| Mode source addr Value 10.27.240.3

 

| virtual any:any node 10.44.254.25 age 41sec

 

| Mode source addr Value 10.27.240.3

 

| virtual any:any node 10.44.254.25 age 46sec

 

| Mode source addr Value 10.27.243.217

 

| virtual any:any node 10.44.254.25 age 2377sec

 

 

It is sent to the same server in the pool but why are there 2 entries?

 

 

Meena

 

config
design

4 Replies

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  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Nov 03, 2010
    Hi Meena,

     

     

    Which LTM version and platform are you running on? I wonder if this has something to do with multiple TMM instances.

     

     

    Aaron
  • meena_60183's avatar
    meena_60183
    Icon for Nimbostratus rankNimbostratus
    Nov 12, 2010
    Yes. It is due to multiple TMM instances. I opened a case with F5 support thinking that one of the problems I am seeing is caused by this issue but turned out to be something else. F5 support told me that it is due to multiple TMM instances.

     

     

    Thank you for the response Aaron.

     

     

    Meena

     

  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Nov 12, 2010
    Thanks for the follow up. So is this behavior expected then? I thought I remembered seeing dupe persistence tables briefly before one was removed on a CMP enabled platform.

     

     

    Aaron
  • meena_60183's avatar
    meena_60183
    Icon for Nimbostratus rankNimbostratus
    Nov 12, 2010
    Yes. It is an expected behavior. Here is the answer from F5 support.

     

     

    "Your hardware platform has a dual processor which has a Traffic Management Microkernel (tmm) per cpu. Each tmm makes a load balancing decision independent of the other. So you can expect to see duplicate entries, one for each tmm. "

     

     

    Meena