WCCP mask value with 4xWSA

[aslakgaaserud]

Hi,

At the moment I'm running two WSA web-proxies and I'm planning to add two more.

For load balancing over the four WSAs, what would be the optimal mask value?

I can't find any good documentation on how to calculate this value.

Best regards,

Aslak

[donnylee]

Hi Aslak,

Not sure if there is any discussion or group that focuses more on WCCP, perhaps under Data Centre Technology. Since WCCP is not controlled from proxy in general, i am afraid you might not get the right answer here.

If I remember correctly, it is recommended to use the smallest mask bit where possible when configuring WCCP redirect ACL to conserve TCAM. For 4 WSAs (WCCP clients) you can use 2 bits.

You could open a TAC case with Content Networking Team to confirm the above.

Hope this helps.

-Donny

[aslakgaaserud]

Hi Donny,

Thanks for the reply.

I have been in touch with TAC and they recommended a 0xF mask.

Not sure what the logic behind that is, but the tech seemed to know what he was talking about

The WCCP whitepaper suggests 0x3 when using 4 WCCP clients.

Initially I will try the 0xF mask and see how that works.

-Aslak

[donnylee]

My recommendation is also based on the WCCP whitepaper, where if you have 4 WCCP clients, use 2 bits.

0x3, where 3 is 0011 in binary, so it's 2 bits.

Anyway, see how you go with 0xF (4 bits)...

-Donny

[Todd Everett]

Aslak,

What device are you redirecting traffic from (aka the WCCP router)?

Using ASAs and Switches, I have never had to manually change the mask, as part of the WCCP v2 process is to manage adding and removing WCCP clients as they become available/unavailable.

I have some device specific WCCP documents I can share if you can summarize your sho ver for me.

Respectfully,

Todd

Content Security Specialist