> enabling bpduguard will prevent any device that participate in > the spanning tree to talk to the network, reducing the risk of having ports > in the wild where users *might* create a network loop. ___Just make sure you > enable an automatic recovery for the port (errdisable recovery) or else this > may require you to manually intervene to restore connectivity.___
Sage advice, especially in a data center environment. Bpduguard has its uses, but only if you can automate the recovery. Otherwise it becomes a massive time-sink. As an aside, PVST can become an issue when you're scaling up into dozens/hundreds of VLANs. All of those spanning tree instances can start to become a drag on your network's cpu/memory resources. You might also consider moving to MSTP if you're using hundreds of VLANs & PVST to free up a bit of your router/switch performance. Network Engineer, JNCIS-M > 214-981-1954 (office) > 214-642-4075 (cell) > [email protected] http://www.speakeasy.net -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tristan Gulyas Sent: Friday, May 22, 2009 6:35 AM To: [email protected] Subject: Re: [c-nsp] How to improve C3750G switch uplink speed? Hi, I find that using spanning-tree uplinkfast is best-suited for uplink ports. If all your equipment supports it, I strongly suggest using Rapid Per-VLAN spanning tree: spanning-tree mode rapid-pvst Which will reduce your convergence time dramatically. I've found standarizing on portfast for PC/server connections is always a good idea - enabling bpduguard will prevent any device that participate in the spanning tree to talk to the network, reducing the risk of having ports in the wild where users *might* create a network loop. Just make sure you enable an automatic recovery for the port (errdisable recovery) or else this may require you to manually intervene to restore connectivity. Good luck, Tristan ----- Original Message ----- From: <[email protected]> To: "Darren Yang" <[email protected]> Cc: <[email protected]> Sent: Tuesday, May 12, 2009 8:52 PM Subject: Re: [c-nsp] How to improve C3750G switch uplink speed? > You are using this port for UPLINK, and it could be a trunk port. I > strongly suggest you should not use portfast on this port. This way you > can avoid loops and 30 second wait will be worth it. > > Regards, > Masood > Blog: http://weblogs.com.pk/jahil/ > > >> Hi, >> >> When I plug wire into c3750g port, it would wait about "30sec" then >> change to uplink status. >> >> Are there any method can cut down uplink time? >> >> >> Regards, >> Pigsign >> _______________________________________________ >> 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/ _______________________________________________ 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/
