ARP Poison - Sniffing Uplinked Switch

[elluk () orange net]

Hi,

I have constructed a test environment to prove concept of sniffing a switched network via arp poisoning. This works a 
treat.

However, I am interested to know if there is a way to poison the mac address table of a sencond switch that is uplinked 
to my first, (With the aim of intercepting traffic from another box on that secondary switch).

Could this be done?

Regards,

EL