[c-nsp] FWSM traffic distribution across internal etherchannel

[David White, Jr. (dwhitejr)]

Hi Nick,

Changing the SUP's load-balancing algorithm (which is what is described
in the link provided) only affects the traffic that egresses the switch
and ingresses the FWSM.  It does not impact the packet distribution in
the reverse direction (egress the FWSM and ingress on the switch).

I didn't indicate that I would need to know the traffic profile to
determine the correct SUP load-balancing algorithm, but rather to
explain why ports 3 and 6 were mainly utilized for traffic egressing the
FWSM - which was Jack's original question.

Sincerely,

David.

NMaio at guesswho.com wrote:
> David,
> The section named "Customizing the FWSM Internal Interface" in the following page
> http://www.cisco.com/en/US/docs/security/fwsm/fwsm31/configuration/guide/switch_f.html
> would be helpful.
>
> As you stated you would need to know the traffic profile to detemine the correct algorithm but why would you say that there aren't any commands to change this?  The command is not run in the fwsm but rather the switch/router.
> Nick
>
>
> ________________________________________
> From: cisco-nsp-bounces at puck.nether.net [cisco-nsp-bounces at puck.nether.net] On Behalf Of David White, Jr. (dwhitejr) [dwhitejr at cisco.com]
> Sent: Tuesday, October 27, 2009 8:29 PM
> To: jack b
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] FWSM traffic distribution across internal etherchannel
>
> Hi Jack,
>
> Yes, it is most likely that this is normal.  There are no CLI commands
> on the FWSM to adjust this. I would have to understand your traffic
> profile along with your config to tell you why the given profile is
> almost exclusively utilizing ports 3 and 6.
>
> Sincerely,
>
> David.
>
>
> jack b wrote:
>   
>> I have a FWSM running 2.3(4)11 in slot 4 of a 6509. I have noticed that I am
>> getting unequal traffic distribution on the links that make up the ether
>> channel bundle  between the FWSM and 6509.
>>
>> Here is a snapshot of the traffic distribution
>>
>> 4/1    in 28.99mbps    out 458.10mbps
>> 4/2    in 12.37mbps    out 248.31mbps
>> 4/3    in 960.86mbps  out 294.95mbps
>> 4/4    in 34.07mbps    out 505.22mbps
>> 4/5    in 15.08mbps    out 243.10mbps
>> 4/6    in 950.63mbps  out 262.68mbps
>>
>> In is traffic from the FWSM to the switch and out is traffic from the switch
>> to the FWSM.
>>
>> Is this normal operation, or is there a way to distribute the traffic from
>> the FWSM to the switch more evenly?
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>>     
>
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