It should eventually go into a blocking state as the port still participates in STP in portfast mode, this can take 30-50 seconds though, not sure if you've left it that long?
On a side note, if you have Administrative control over both devices and they are in different VTP domains already why not run the links between the 2 business's as Trunks with vlan filtering, that way you can load balance the 2 vlans with priority over the trunks as well as redundancy. Ben On 01/02/2008, at 3:51 PM, Aaron R wrote: > Yes some access ports were portfast! Silly me! > > If any of those access ports are in port fast does this mean that > spanning > tree will not work properly? I know portfast will put the ports into > instant > forwarding mode but it should still receive bpdus in order to make a > decision on what ports are blocked / forwarding yes? Or because they > are > forwarding straight away it doesn't listen to these bpdus in order > to make > this decision. > > Cheers, > > Aaron. > > -----Original Message----- > From: Ben Steele [mailto:[EMAIL PROTECTED] > Sent: Friday, February 01, 2008 2:08 PM > To: Aaron R > Cc: [email protected] > Subject: Re: [c-nsp] Spanning-Tree question > > Do you portfast enabled on those access ports? > > On 01/02/2008, at 3:31 PM, Aaron R wrote: > >> Hi Guys, >> >> >> >> Ive got a problem that I am hoping someone can have a look at. I >> currently >> have four 3750's. Two belonging to one business unit and two >> belonging to >> another. Each group of switches is running a separate VTP domain / >> VLAN >> database. >> >> I am running PVST however when I connect the final link between the >> four >> switches there is a loop and spanning tree doesn't block any of the >> ports. >> Would anyone have any clue as to why this would be happening? Could >> it have >> something to do with the link between the Business units being on >> separate >> VLANs? We don't want the possibility of VLAN corruption occurring >> hence the >> different VTP domains. Currently I am shutting down one of the >> uplink ports >> to Business A to remedy this problem. Please see the diagram below. >> >> >> >> Cheers, >> >> >> >> ------------------------ >> ------------------------ >> >> | 3750 Switch 1 |------- Trunk ------ | 3750 Switch 2 | >> >> | Business A | | Business A | >> >> ------------------------- >> ------------------------- >> >> | VL 50 | VL 50 >> >> >> | | >> >> | VL 100 | VL 100 >> >> >> ------------------------ >> ------------------------ >> >> | 3750 Switch 3 |------- Trunk ------ | 3750 Switch 4 | >> >> | Business B | | Business B | >> >> ------------------------- >> ------------------------- >> >> >> >> >> >> Aaron. >> >> >> >> >> >> _______________________________________________ >> cisco-nsp mailing list [email protected] >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
