Quick span tree question
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From: unix on 27 Apr 2010 09:47 I have an assumption that having 2 switches with single fiber trunk, there is no way for broadcast loops to form. If I add another trunk cable, then spanning tree kicks in. Correct?
From: berkid on 27 Apr 2010 10:59 berkid had written this in response to http://www.telecom-gear.com/cisco/Quick-span-tree-question-61122-.htm : unix wrote: -- right, if the spanning-tree is turned on and work well, one of the switchport will be blocked, so only one connection will be used for frame forwarding. If you want to use both of the connection then the best is for this situation is using port-channel. ##-----------------------------------------------## Telecom Discussions at http://www.telecom-gear.com/ no-spam access to your favorite newsgroup - comp.dcom.sys.cisco - 51948 messages and counting! ##-----------------------------------------------##
From: bod43 on 27 Apr 2010 12:06 On 27 Apr, 15:59, berkdan_at_freemail_dot...(a)foo.com (berkid) wrote: > berkid had written this in response tohttp://www.telecom-gear.com/cisco/Quick-span-tree-question-61122-.htm : > > unix wrote: > > > right, if the spanning-tree is turned on and work well, one of the > switchport will be blocked, so only one connection will be used for frame > forwarding. If you want to use both of the connection then the best is for > this situation is using port-channel. Unless STP is turned off it still runs even if there is only one link. Of course all ports remain Forwarding. I think most people leave STP running even if the network theoretically does not need it in order to protect the network from inadvertant creation of loops due to incorrect patching. If I didn't need the bandwidth I would avoid port-channel on trunk links since it is possible to very easily break the network when adding/removing vlans to/from trunks. If you need the bandwidth then of course go ahead:)
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