2650 Stacking and Trunking

[foreigner1]

Hello,
if I have two 2650 switches in a stack, can I then create a trunk with 2 interfaces, where the 1st interface belongs to switch 1 and the 2nd interface belongs to switch 2?

switch 1 ------------- switch 3
-stacked- -trunk- -stacked-
switch 2 ------------- switch 4

If for instance switch 1 fails, there shall still be a connection between switch 2 and the stack pair 3/4. Is this possible?

Thanks, Thomas

 

[hermmert]

A trunk has to start from one switch and end on one switch.
When you stack two 2650 switches, you only IP-stack them.
Then the switches in the stack are accessible via one IP-address, you won't create ONE switch with 100 ports.
When you have trunk1 on switch 1 (with one interface) and trunk1 on switch 2 (with one interface),
you have created 2 trunks with the same name (each using only one interface).
So, you will have created a loop in your network.
For your backup solution, you can use "spanning tree"; this will switch off redundant links (see ftp://ftp.hp.com/pub/networking/software/AdvTraff-Oct2005-59908853-Chap05-STP_RSTP.pdf ).