carrier-delay? Sent from my iPhone
> On 17/07/2013, at 11:23, Shanawaz Batcha <[email protected]> wrote: > > Thanks for the suggestions. > > * I am definitely not disabling spanning-tree. I have enabled 'portfast > trunk' on the port which reduced the port uptime significantly. > * Disabling a lot of negotiation protocols improves port initialization > time as well > > However we still lose about 5 pings. Digging further, I find that it takes > about 4 seconds for the 6500 to register a port-transition. Down to up or > up to down. So from the moment, a cable is plugged in, it takes about 4 > seconds for the SP to register the port as up and pass traffic. This is > just layer 1, not spanning-tree or anything. > > Is this as good as it gets or is there a trick to perhaps get this time > further down? > > >> On Sat, Jul 13, 2013 at 9:19 AM, james <[email protected]> wrote: >> >> He is utilizing bpduguard as well so that should help reduce the chance of >> a loop. >> >> >> Sent from my Verizon Wireless 4G LTE Smartphone >> >> >> >> -------- Original message -------- >> From: Tóth András <[email protected]> >> Date: 07/12/2013 6:00 PM (GMT-05:00) >> To: Tom Storey <[email protected]> >> Cc: Shanawaz Batcha <[email protected]>,[email protected] >> Subject: Re: [c-nsp] Cisco trunk port startup delay >> >> >> I would not encourage disabling STP at all, "portfast trunk" already >> increases the chances of creating a loop, on the other hand it does allow >> the port to transition to STP forwarding state immediately, so it should >> have the same effect. >> >> Given that the delay is due to the actual link down and likely re-ARP-ing, >> the only option for further reduce the delay is to dual-home the servers, >> preferably with a port-channel (etherchannel) such as 802.3ad LACP. That >> will provide redundancy and sub-second failover if one member link goes >> down or flaps. >> >> Andras >> >> >> >>> On Fri, Jul 12, 2013 at 7:26 PM, Tom Storey <[email protected]> wrote: >>> >>> If they are connecting to servers, do you really need spanning tree? >>> >>> I assume that spanning tree is blocking for x period of time, where x is >>> long or short depending on whether portfast is enabled. >>> >>> If you remove spanning tree then there is no blocking, and it should come >>> up and be able to pass traffic as quickly as MAC tables can update? >>> >>> >>> >>>> On 11 July 2013 01:32, Shanawaz Batcha <[email protected]> wrote: >>>> >>>> Hi Guys, >>>> >>>> Question for you is how soon can we get a cisco trunk port (connecting >> to >>>> some enterprise servers) to initialize and pass traffic. >>>> >>>> From >>>> >>>> interface GigabitEthernet4/40 >>>> >>>> switchport >>>> >>>> switchport trunk encapsulation dot1q >>>> >>>> switchport trunk native vlan 104 >>>> >>>> switchport mode trunk >>>> >>>> spanning-tree bpduguard enable >>>> >>>> end >>>> >>>> >>>> With the above configuration, we were losing about 50 pings for an >>> if-down >>>> event >>>> >>>> Enabling "portfast trunk" (no redundant connections), we lost somewhere >>>> between 10 and 15 pings. Which is way better. >>>> >>>> Running "switchport nonegotiate" to disable DTP gives me another ~2 >>> seconds >>>> >>>> Disabling inline power and "disabling lldp" gives me another ~1 or 2 >>>> seconds >>>> >>>> We are still losing about 6 pings. Anything else people do/tune to get >>>> quicker convergence if I may call it? >>>> >>>> Regards, >>>> Shan >>>> _______________________________________________ >>>> 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/ >> > > > > -- > “Twenty years from now you will be more disappointed by the things that you > didn't do than by the ones you did do. So throw off the bowlines. Sail away > from the safe harbor. Catch the trade winds in your sails. Explore. Dream. > Discover.” > _______________________________________________ > 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/
