Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

Dual trunk from access SW--> Single Core- Simple quesry

Hi All,

Iam planning to add dual trunk links to Single core device from 3560G sw (both end all port hard coded to 1000/full). Spanningtree will block one of the link (core is the root and hence on the access sw). I have this running on other switches as well, but wanted to get experts openion if this is sufficient or is there any additional 'spanning-tree' cost configuration is recomended on one of the trunks so that it always be blocked/backup only.

TIA

MS

3 REPLIES
Hall of Fame Super Blue

Re: Dual trunk from access SW--> Single Core- Simple quesry

MS

Personally i would combine the links into a L2 etherchannel trunk and that way you don't have to worry about STP.

Is there any reason why you don't want to use etherchannel ?

Jon

Re: Dual trunk from access SW--> Single Core- Simple quesry

Thanks Jon. 1Gig BW enough here but I will check on this as well. The Core switch ports are different modules (ex: 4/10 & 5/40), it does not matter what module they are . is that correct?

TIA

MS

Hall of Fame Super Blue

Re: Dual trunk from access SW--> Single Core- Simple quesry

MS

"The Core switch ports are different modules (ex: 4/10 & 5/40), it does not matter what module they are . is that correct?"

Correct, the ports can be on different modules as long as they are the same speed/duplex etc..

Jon

184
Views
8
Helpful
3
Replies