Intermittent access from APP to DB Server after deploying ACE 4710

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Feb 12th, 2009
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Hi,


This mail is regarding ACE configuration issue.


Please find some info on the setup & the lists of task that we tried to encounter the issue.


1. We have ACE 4710 configured in Bridge mode. ACE 2 interfaces connected with Core Switch. One interface in VLAn 10 (client vlan) & the other in VLAN 100 (server vlan).

2. Only one L3 VLAN 10 is configured in core switch. IN ACE L2 VLAN 10 & 100 is configured for bridging purpose.

3. VLAN 10: Client VLAN

4. VLAn 100: Server VLAN

5. Both of these VLAN's have same IP addressing.

6. There are 2 Cisco Blade Enclosures (Enc1 & Enc 2) connected to Core Switch (4507) in Trunk mode. From individual Enc there are 2 cables connected with core switch.

7. In every Enc there are 8 ports which all in VLAN 100. In every Enc there are 2 blade switches among which 1 is standby & the other active.

8. Please find the IP's for these blade switches.


ENC1:

Sw1: 10.10.10.13

Sw2: 10.10.10.14

ENC2:

Sw1: 10.10.10.15

Sw2: 10.10.10.16

9. There are 2 APP & 2 Staging servers which are in VLAN 10 where as 2 DB servers are in VLAN 100 (all have same VLAN 10 IP)


Problem Facing:


Intermittently, connection from APP server to DB server takes more time (near about 10 seconds). In Ideal condition. it gets connected instantly using SQLPLUS.


Tasks Carried Out:


A. Enabled "Normalization in client vlan 10 in ACE". After enabling this parameter, the frequency of intermittent login to DB from APP got reduced (it is still enabled).


B. Enabled "TCP-Buffer-Share", "TCP-ACK-DELAY","PM-CON-MSS-SET" but it increased the intermittent access frequency so disabled.


C. Sniffed packets. On some occasion it was found from Sniffer that packets received at Client VLAN & in Server VLAN has different TCP sessions for a "similar instance".



Attached docs as follows:


1. ACE config (only normalization enabled on Client & Server VLAN 10 & 100 respectively).

2. ENC1-SW-1

3. ENC1-SW-2

4. ENC2-SW-1

5. ENC2-SW-2

6. SH_LOG_ACE

7. CAPTURE_CLIENT_VLAN

8. CAPTURE_SERVER_VLAN

9. SOW FOR LAOD BALANCERS


Any help on this will be


Rgds,


Partha













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Gilles Dufour Thu, 02/12/2009 - 05:21
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  • Cisco Employee,

I don't see the sniffer trace.

This is the most important part.

Could you please attach it to the forum.


Thanks.


Gilles.

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