[c-nsp] 6500 with SUP720 SPAN questions, Again...

[Tim Stevenson]

To span, say, two of the spanned vlans to one of the configured dest ports, 
just add multiple vlans to the allowed list, ie, sw trunk all vlan 10-11, 
or similar.

The config I mentioned will include the 1q headers already. If you don't 
want that, you could make the native vlan of the span dest port trunk the 
vlan you have in the allowed list.

One word of caution on this configuration. The system is not (currently, & 
no firm plans) intelligent enough to not send ALL the SPAN traffic to ALL 
the destintaion modules, even if that module ultimately won't forward the 
traffic because of the allowed vlan list.

For example, if I have a fabric enabled system with modules 1 2 & 3, and I 
span vlans 10 & 11 from module 1 to dest ports on module 2 & 3, where the 
allowed list on the mod 2 port is 10 & the allowed list on the mod 3 port 
is 11, VLAN 10 & 11 traffic is passed over BOTH the fabric channels, the 
one  connecting to module 2 & the one connecting to module 3, even though 
module 2 will ultimately drop the vlan 11 traffic & module 3 will drop the 
vlan 10 traffic.

Tim

At 05:22 PM 3/17/2005, Virgil declared:
>On 18/3/05 7:29 AM, "Tim Stevenson" <tstevens at cisco.com> wrote:
>
>Tim,
>
> > And then configure a single SPAN session like so:
> >
> > mon ses 1 source vlan 10 - 13
> > mon ses 1 dest int gig 1/1 - 4
> >
> > This ends up spanning just vlan 10 traffic to int gig 1/1, just vlan 11
> > traffic to int gig 1/2, etc.
>
>That's excellent information.  What would be required to receive traffic for
>a couple of vlans to one port, and include the dot1q headers as well?
>
>
>Regards
>Virgil



Tim Stevenson, tstevens at cisco.com
Routing & Switching CCIE #5561
Technical Marketing Engineer, Catalyst 6500
Cisco Systems, http://www.cisco.com
IP Phone: 408-526-6759
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