fao: Catalyst Gurus [7:8177]
We have just installed some new catalyst switches 650x and 69xx. I have noticed that whenever I connected with a fluke to test connectivity on the ports, it takes approximately 20 secs to get its first contact with another device. I'm aware the switch port needs to learn the mac address etc but I would not have thought it would take so long. Are there any commands that would speedup the network discovery or is this normal behaviour on a new port? Pardon this trivial question but it would help. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8177&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
you should enable portfast (diasbles stp) this should speed things up Cheers Colin At 11:29 AM 6/12/01 -0400, Larry Ogun-Banjo wrote: >We have just installed some new catalyst switches 650x and 69xx. I have >noticed >that whenever I connected with a fluke to test connectivity on the ports, it >takes approximately 20 secs to get its first contact with another device. I'm >aware the switch port needs to learn the mac address etc but I would not have >thought it would take so long. Are there any commands that would speedup the >network discovery or is this normal behaviour on a new port? >Pardon this trivial question but it would help. Colin Byelong Email: [EMAIL PROTECTED] Network Group Information Systems Division University College London Gower Street Phone: 020 7679-2572 London WC1E 6BT Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8179&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
You are experiencing the Spanning Tree process, which blocks ports temporarily while it determines if you just have hosts connected to that port or if you are connecting additional switches. This process takes about 30 seconds. If you want to turn this off on a port-by-port basis you need to enable a feature called PortFast. I don't know the exact syntax on a 6500 so you'll have to check into that. HTH, John >>> "Larry Ogun-Banjo" 6/12/01 9:29:53 AM >>> We have just installed some new catalyst switches 650x and 69xx. I have noticed that whenever I connected with a fluke to test connectivity on the ports, it takes approximately 20 secs to get its first contact with another device. I'm aware the switch port needs to learn the mac address etc but I would not have thought it would take so long. Are there any commands that would speedup the network discovery or is this normal behaviour on a new port? Pardon this trivial question but it would help. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8188&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
Larry, two things that can cause the delay: STP - Spanning Tree Protocol Solution: 'set spantree portfast enable' (Use it only on end-station ports) PAgP - Port Aggregation Protocol Solution: 'set port channel off' (PAgP is enabled by default on EtherChannel capable links) HTH Reinhold On Tue, 12 Jun 2001, Larry Ogun-Banjo wrote: > We have just installed some new catalyst switches 650x and 69xx. I have > noticed > that whenever I connected with a fluke to test connectivity on the ports, it > takes approximately 20 secs to get its first contact with another device. I'm > aware the switch port needs to learn the mac address etc but I would not have > thought it would take so long. Are there any commands that would speedup the > network discovery or is this normal behaviour on a new port? > Pardon this trivial question but it would help. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8192&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
Not quite correct. PortFast does not disable STP. It puts a port initially into 'Forwarding' state and then watches if loops occur. If for some reason the port is forced into 'Blocking' state and later needs to return to the 'Forwarding' state, it has to go through the 'Listening' and 'Learning' phases. hth Reinhold On Tue, 12 Jun 2001, Colin Byelong wrote: > you should enable portfast (diasbles stp) > this should speed things up > > Cheers > > Colin > > > > > At 11:29 AM 6/12/01 -0400, Larry Ogun-Banjo wrote: > >We have just installed some new catalyst switches 650x and 69xx. I have > >noticed > >that whenever I connected with a fluke to test connectivity on the ports, it > >takes approximately 20 secs to get its first contact with another device. > I'm > >aware the switch port needs to learn the mac address etc but I would not > have > >thought it would take so long. Are there any commands that would speedup the > >network discovery or is this normal behaviour on a new port? > >Pardon this trivial question but it would help. > Colin Byelong Email: [EMAIL PROTECTED] > Network Group > Information Systems Division > University College London > Gower Street Phone: 020 7679-2572 > London WC1E 6BT > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8194&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
Thanks for clarifying that. cheers Colin At 06:16 PM 6/12/01 +0200, Reinhold Fischer wrote: >Not quite correct. PortFast does not disable STP. It puts a port initially >into 'Forwarding' state and then watches if loops occur. If for some reason >the port is forced into 'Blocking' state and later needs to return to the >'Forwarding' state, it has to go through the 'Listening' and 'Learning' >phases. > >hth > >Reinhold > >On Tue, 12 Jun 2001, Colin Byelong wrote: > >> you should enable portfast (diasbles stp) >> this should speed things up >> >> Cheers >> >> Colin >> >> >> >> >> At 11:29 AM 6/12/01 -0400, Larry Ogun-Banjo wrote: >> >We have just installed some new catalyst switches 650x and 69xx. I have >> >noticed >> >that whenever I connected with a fluke to test connectivity on the ports, it >> >takes approximately 20 secs to get its first contact with another device. >> I'm >> >aware the switch port needs to learn the mac address etc but I would not >> have >> >thought it would take so long. Are there any commands that would speedup the >> >network discovery or is this normal behaviour on a new port? >> >Pardon this trivial question but it would help. >> Colin Byelong Email: [EMAIL PROTECTED] >> Network Group >> Information Systems Division >> University College London >> Gower Street Phone: 020 7679-2572 >> London WC1E 6BT >> > -- Colin Byelong Email: [EMAIL PROTECTED] Network Group Information Systems Division University College London Gower Street Phone: 020 7679-2572 London WC1E 6BT Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8195&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
Many thanks for everyones contribution on this issue. I forgot to mention that Spanning tree is not enabled. No tbeing too familiar with switches, I'm not sure on the effect of PAgP. Reinhold Fischer on 06/12/2001 06:09:51 PM To: Larry Ogun-Banjo/EN/Kpn-Orange@kpn-orange cc: [EMAIL PROTECTED] Subject: Re: fao: Catalyst Gurus [7:8177] Larry, two things that can cause the delay: STP - Spanning Tree Protocol Solution: 'set spantree portfast enable' (Use it only on end-station ports) PAgP - Port Aggregation Protocol Solution: 'set port channel off' (PAgP is enabled by default on EtherChannel capable links) HTH Reinhold On Tue, 12 Jun 2001, Larry Ogun-Banjo wrote: > We have just installed some new catalyst switches 650x and 69xx. I have > noticed > that whenever I connected with a fluke to test connectivity on the ports, it > takes approximately 20 secs to get its first contact with another device. I'm > aware the switch port needs to learn the mac address etc but I would not have > thought it would take so long. Are there any commands that would speedup the > network discovery or is this normal behaviour on a new port? > Pardon this trivial question but it would help. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8202&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
EtherChannel allows you to bundle physical links into one logical link. As example you can create a 200Mpbs pipe out of 2 100Mbps links. PAgP is the protocol that negotiates this channel. PAgP is by default active on all ports that are EtherChannel capable. PAgP uses the first 15 to 20 seconds after link initialization to try to negotiate an EtherChannel. If you don't intend to use EtherChannel you can safely disable PAgP. Greetings Reinhold On Tue, 12 Jun 2001, Larry Ogun-Banjo wrote: > Many thanks for everyones contribution on this issue. I forgot to mention that > Spanning tree is not enabled. No tbeing too familiar with switches, I'm not sure > on the effect of PAgP. > > > Reinhold Fischer on 06/12/2001 06:09:51 PM > > To: Larry Ogun-Banjo/EN/Kpn-Orange@kpn-orange > cc: [EMAIL PROTECTED] > Subject: Re: fao: Catalyst Gurus [7:8177] > > Larry, > > two things that can cause the delay: > > STP - Spanning Tree Protocol > > Solution: 'set spantree portfast enable' > (Use it only on end-station ports) > > PAgP - Port Aggregation Protocol > > Solution: 'set port channel off' > (PAgP is enabled by default on EtherChannel capable links) > > HTH > > Reinhold > > On Tue, 12 Jun 2001, Larry Ogun-Banjo wrote: > > > We have just installed some new catalyst switches 650x and 69xx. I have > > noticed > > that whenever I connected with a fluke to test connectivity on the ports, it > > takes approximately 20 secs to get its first contact with another device. I'm > > aware the switch port needs to learn the mac address etc but I would not have > > thought it would take so long. Are there any commands that would speedup the > > network discovery or is this normal behaviour on a new port? > > Pardon this trivial question but it would help. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8205&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: fao: Catalyst Gurus [7:8177]
it'll speed things upp, but it sure as hell will NOT disable STP on that interface. Peter Slow, CCNP Voice Specialist Network Engineer Planetary Networks - Original Message - From: Colin Byelong To: Sent: Tuesday, June 12, 2001 11:36 AM Subject: Re: fao: Catalyst Gurus [7:8177] > you should enable portfast (diasbles stp) > this should speed things up > > Cheers > > Colin > > > > > At 11:29 AM 6/12/01 -0400, Larry Ogun-Banjo wrote: > >We have just installed some new catalyst switches 650x and 69xx. I have > >noticed > >that whenever I connected with a fluke to test connectivity on the ports, it > >takes approximately 20 secs to get its first contact with another device. > I'm > >aware the switch port needs to learn the mac address etc but I would not > have > >thought it would take so long. Are there any commands that would speedup the > >network discovery or is this normal behaviour on a new port? > >Pardon this trivial question but it would help. > Colin Byelong Email: [EMAIL PROTECTED] > Network Group > Information Systems Division > University College London > Gower Street Phone: 020 7679-2572 > London WC1E 6BT > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=8210&t=8177 -- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
