TCP Probe failure on CSM

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Dec 17th, 2007
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I have had a customer raise an issue with me. Unfortunately I am not too hot on the CSM.



Switch Type - Cisco WS-C6513


IOS VSN - 12.2(18)SXF4


CSM Module details


Card Type - SLB Application Processor Module


Model - WS-X6066-SLB-APC


Hardware VSN - 1.8


Software VSN - 4.2(5)


I have spotted bug CSCsc38892, but cannot tell if the catakyst is running VRF - this is all the info I have been given.


We have 6500 chassis each with a CSM module in fault tolerance (ft) mode.


The current standby module (at the time it was the active one) reports as per output below that probes failed:


sh mod csm 1 real sf SAPCCP


real server farm weight state conns/hits

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

10.xxx.xxx.xxx:8000 SAPCCP 8 PROBE_FAILED 0

10.xxx.xxx.xxx:8000 SAPCCP 8 PROBE_FAILED 0

10.xxx.xxx.xxx:8000 SAPCCP 8 PROBE_FAILED 0


Probe failed could be for a number of reasons however the inconsistency is that the failed probes follow the CSM module and that the other module has working probes.

It is to be noted that the command “ping module csm 1 10.xxx.xxx.xxx” reports to be reachable as a good indicator that there is connectivity from the CSM to the server.


The following is the output from the currently active CSM (which used to be the standby one):


sh mod csm 1 real sf SAPCCP


real server farm weight state conns/hits

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

10.xxx.xxx.xxx:8000 SAPCCP 8 OPERATIONAL 51

10.xxx.xxx.xxx:8000 SAPCCP 8 OPERATIONAL 41

10.xxx.xxx.xxx:8000 SAPCCP 8 OPERATIONAL 52




For info:



FUNCTIONING CSM


sh mod 1

Mod Ports Card Type Model Serial No.

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

1 4 SLB Application Processor Complex WS-X6066-SLB-APC SAD094803UC


Mod MAC addresses Hw Fw Sw Status

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

1 0015.f998.a94a to 0015.f998.a951 1.8 4.2(5) Ok


Mod Online Diag Status

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

1 Pass




relevant config lines

serverfarm SAPCCP

nat server

no nat client

failaction purge

real 10.xxx.xxx.xxx 8000

inservice

real 10.xxx.xxx.xxx 8000

inservice

real 10.xxx.xxx.xxx 8000

inservice

probe ABAP


vserver SAPCCP-VIP

virtual 10.xxx.xxx.xxx tcp www

vlan xxx

serverfarm SAPCCP

sticky 15 group 117

replicate csrp sticky

replicate csrp connection

no persistent rebalance

parse-length 4000

inservice


probe ABAP tcp

interval 2

retries 2

failed 6

open 3

port 8000



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paul.matthews Mon, 12/17/2007 - 07:03
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Continued:



NON-FUNCTIONING CSM


sh mod 1

Mod Ports Card Type Model Serial No.

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

1 4 SLB Application Processor Complex WS-X6066-SLB-APC SAD094609ZZ


Mod MAC addresses Hw Fw Sw Status

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

1 0015.f998.8386 to 0015.f998.838d 1.8 4.2(5) Ok


Mod Online Diag Status

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

1 Pass



relevant config lines

serverfarm SAPCCP

nat server

no nat client

failaction purge

real 10.xxx.xxx.xxx 8000

inservice

real 10.xxx.xxx.xxx 8000

inservice

real 10.xxx.xxx.xxx 8000

inservice

probe ABAP-CCP


vserver SAPCCP-VIP

virtual 10xxx.xxx.xxx tcp www

vlan xxx

serverfarm SAPCCP

sticky 15 group 117

replicate csrp sticky

replicate csrp connection

no persistent rebalance

parse-length 4000

inservice


probe ABAP-CCP tcp

recover 2

interval 6

retries 2

failed 6

open 5

port 8000


Thanks for any pointers on where to look,

Paul.

tporembski Tue, 02/03/2009 - 09:39
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I would check the ARP table on both CSMs and make sure it is correct for the servers in question.

Gilles Dufour Wed, 02/04/2009 - 03:05
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Get a sniffer trace on the standby CSM.

See if the probes are fired or not and if the does get a response from the server.


G

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