Re: [AFMUG] stp

[Jesse DuPont]

I don't know what all vendors use for their defaults, but one of the simplest things you can do to help stabilize RSTP is to be intentional about which device is the root bridge (i.e. closest switch/bridge to traffic egress/ingress or core or what ever you define as the "root"). Make sure that device has the lowest priority so that all other bridges are working to have the best path to that device. if you want traffic in a bridged network to flow a specific way, you can influence that with RSTP path cost. None of this replaces routing (ducks), but it's better than leaving them all at default priority and letting them elect the root. Jesse DuPont Network Architect email: jesse.dup...@celeritycorp.net Celerity Networks LLC Celerity Broadband LLC Like us! facebook.com/celeritynetworksllc Like us! facebook.com/celeritybroadband On 10/25/16 9:08 PM, That One Guy /sarcasm wrote: STP is dynamic, when we were solely a Milan switched network it was off by default, when we moved to HP it was off by default, now its on by default for everything even HP, I assume if I read release notes on new models I would have known that. I prefer dynamic things be off and we turn them on loop mitigation i guess i can see being worthwhile to have on by default, but generally when you create a loop its by mistake, and if you dont know its on, it creates a dynamic troubleshooting environment I like knowing its generally going to be on, the mikrotik thing was unexpected, global off would be nice when i was just a tech they implemented rstp on the network for redundant crummy links and dicked with the timers the links would flap and kick off a random root run around the network for hours, you cant get greedy with stp On Tue, Oct 25, 2016 at 9:23 PM, Faisal Imtiaz <fai...@snappytelecom.net> wrote: very simple.. a) it is on by default in CISCO Equipment b) it catches people by surprise, cause it does not output to logs as to what is going on. c) one can only see the status of a blocked port if one issues the stp command. but the biggest one is... d)  Cisco switches will react to STP messages being broadcast from a totally different section of a connected network... ! so, simply by the virtue of 'Cisco of Right' and they have the highest quantity of switches deployed in the field... and this is one of the biggest gotchas, when the folks experience it..... they  (cisco) automatically gets  the brunt of the black eye !.... No one starts a story with .. " Let me tell you how I made a mistake...." but the story always starts with .." Ahhh what a POS, let me tell you what I had to endure due to this  POS !  ". :) Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net From: "Ken Hohhof" <af...@kwisp.com> To: af@afmug.com Sent: Tuesday, October 25, 2016 6:18:21 PM Subject: Re: [AFMUG] stp Why do people act like STP is some evil proprietary Cisco thing?  If you don’t want it, turn if off, but don’t make it sound like Cisco pulled it out of their ass, it’s a perfectly standard Layer 2 protocol.   CDP you can yell at Cisco (although Mikrotik supports it).  Certain VLAN error messages you can yell at Cisco.     From: Af [mailto:af-boun...@afmug.com] On Behalf Of Carlos Alcantar Sent: Tuesday, October 25, 2016 4:58 PM To: af@afmug.com Subject: Re: [AFMUG] stp   on the access side where you might have issues with stp is if your customer is then connecting to a cisco switch these stp messages between equipment can get funny and start shutting off ports because one side supports it and the other doesn't.  you'll go crazy locating these issues.       Carlos Alcantar Race Communications / Race Team Member  1325 Howard Ave. #604, Burlingame, CA. 94010 Phone: +1 415 376 3314 / car...@race.com / http://www.race.com   From: Af <af-boun...@afmug.com> on behalf of Josh Reynolds <j...@kyneticwifi.com> Sent: Tuesday, October 25, 2016 2:38:04 PM To: af@afmug.com Subject: Re: [AFMUG] stp   You veered way off into something I wasn't even talking about. There's nothing wrong with a loop protect on an access port, but since its not an official standard, there will be variances in loop detection algorithm quality and design between vendors. YMMV. That said, there's nothing wrong with STP on access ports either.   On Oct 25, 2016 4:27 PM, "George Skorup" <geo...@cbcast.com> wrote: Care to explain? What's wrong with simple loop-protect on an edge port facing a dumb customer? On 10/25/2016 3:07 PM, Josh Reynolds wrote: *facepalm*   On Oct 25, 2016 3:06 PM, "George Skorup" <geo...@cbcast.com> wrote: Lots of switch vendors and even MikroTik (in the 6.37 branch, IIRC) support loop protection. If all you care about is stopping a loop, then use that. Use STP if you need its functionality. On 10/25/2016 1:16 PM, Josh Reynolds wrote: If one of the ports has a loop, it will block only that port. Obviously, disable STP on uplinks.   On Oct 25, 2016 1:08 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: But if you only have one upstream connection and you fall, it isn’t going to do anything, right?   From: Josh Reynolds Sent: Tuesday, October 25, 2016 12:01 PM To: af@afmug.com Subject: Re: [AFMUG] stp   STP is a safety net. Its not doing much unless you fall.   On Oct 25, 2016 12:44 PM, "Chuck McCown" <ch...@wbmfg.com> wrote: How can STP being enabled help anything if you are not using it?   From: Josh Luthman Sent: Tuesday, October 25, 2016 10:10 AM To: af@afmug.com Subject: Re: [AFMUG] stp   I just learned the other day thanks to Steve the Mikrotik software bridges are (R?) STP by default.     Josh Luthman Office: 937-552-2340 Direct: 937-552-2343 1100 Wayne St Suite 1337 Troy, OH 45373   On Tue, Oct 25, 2016 at 12:07 PM, Bill Prince <part15...@gmail.com> wrote: Actually Netonix (one t, no r). I don't know that I would leave it on, but I don't know how you're using it. https://www.netonix.com/wisp-switch.html bp <part15sbs{at}gmail{dot}com>   On 10/25/2016 9:04 AM, Josh Reynolds wrote: Nettonix. You could always leave it on... If your access network is layer2 up to that switch, it could help.   On Oct 25, 2016 11:03 AM, "CBB - Jay Fuller" <par...@cyberbroadband.net> wrote:   just discovered on one of our nettronix switches spanning tree protocol was enabled. we've run this switch probably four months - no real side effects - but i don't run stp anywhere else.  any reason to leave this on?   thanks             -- If you only see yourself as part of the team but you don't see your team as part of yourself you have already failed as part of the team.