Comments on: Weekly Open Ended Question #5 http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/ Just another Cisco blog Mon, 23 Jan 2012 23:37:03 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Weekly Open Ended Question #6 | AlwaysTheNetwork http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-539 Weekly Open Ended Question #6 | AlwaysTheNetwork Thu, 04 Mar 2010 04:16:57 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-539 [...] Labs « Weekly Open Ended Question #5 [...] [...] Labs « Weekly Open Ended Question #5 [...]

]]> By: NMAIO http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-532 NMAIO Mon, 01 Mar 2010 09:42:13 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-532 @ZeroZeroFourteen Depending on how you interpret this question I would say your response it not totally correct. While "switchport nonnegotiate" does disable DTP on the port which prevents automatically forming a trunk "switchport mode trunk" does not disable DTP and will automatically for a trunk with the other side if that side is set to on/auto/desirable. @ZeroZeroFourteen
Depending on how you interpret this question I would say your response it not totally correct. While “switchport nonnegotiate” does disable DTP on the port which prevents automatically forming a trunk “switchport mode trunk” does not disable DTP and will automatically for a trunk with the other side if that side is set to on/auto/desirable.

]]> By: Smail http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-529 Smail Fri, 26 Feb 2010 18:38:39 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-529 If the VTP domain is different on the switches, the trunk will not come up automatically. Am I right? Note: Some of the switches do not show this error message. 4w2d: %DTP-SP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa3/ 3 because of VTP domain mismatch. The solution for this issue is to manually force the trunking instead in order to rely on the DTP. Configure the trunk ports between the switches with the switchport mode trunk command. Switch1(config)#interface fastethernet 1/0/23 switch1(config-if)#switchport mode trunk Switch2(config)#interface fastethernet 3/3 switch2(config-if)#switchport mode trunk http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080890613.shtml If the VTP domain is different on the switches, the trunk will not come up automatically.

Am I right?

Note: Some of the switches do not show this error message.

4w2d: %DTP-SP-5-DOMAINMISMATCH: Unable to perform trunk negotiation on port Fa3/
3 because of VTP domain mismatch.

The solution for this issue is to manually force the trunking instead in order to rely on the DTP. Configure the trunk ports between the switches with the switchport mode trunk command.

Switch1(config)#interface fastethernet 1/0/23
switch1(config-if)#switchport mode trunk

Switch2(config)#interface fastethernet 3/3
switch2(config-if)#switchport mode trunk

http://www.cisco.com/en/US/tech/tk389/tk689/technologies_tech_note09186a0080890613.shtml

]]> By: ZeroZeroFourteen http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-528 ZeroZeroFourteen Fri, 26 Feb 2010 18:36:24 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-528 DTP switchport mode nonnegotiate creates a perminent trunk with no dtp or switch port mode access creates permanent non-trunk and also does not run DTP DTP

switchport mode nonnegotiate creates a perminent trunk with no dtp

or

switch port mode access creates permanent non-trunk and also does not run DTP

]]> By: Colby http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-527 Colby Fri, 26 Feb 2010 17:55:25 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-527 I had to add the CAPTCHA stuff cause I was getting a ton of spam. I figured no one would like it, but it's a lot easier than manually removing all the spam posts every day.:) One nice thing is that if you register on here you won't have to do it. I had to add the CAPTCHA stuff cause I was getting a ton of spam. I figured no one would like it, but it’s a lot easier than manually removing all the spam posts every day.:)

One nice thing is that if you register on here you won’t have to do it.

]]> By: Noah http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-525 Noah Fri, 26 Feb 2010 16:17:46 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-525 VTP has nothing to do with forming trunks Daniel. VTP has nothing to do with forming trunks Daniel.

]]> By: Daniel http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-524 Daniel Fri, 26 Feb 2010 16:02:46 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-524 VTP can't disable it, closest you can come is transparent mode Port Modes desirable makes it so it tries to become a trunk active makes it accept becoming a trunk if the other one tries to be a trunk access, makes it so it it is just an access port truk, makes it so it is a trunk port and not a big fan of the "make sure this person is human" thing, unless you have had an issue with it in the past VTP
can’t disable it, closest you can come is transparent mode

Port Modes
desirable makes it so it tries to become a trunk
active makes it accept becoming a trunk if the other one tries to be a trunk
access, makes it so it it is just an access port
truk, makes it so it is a trunk port

and not a big fan of the “make sure this person is human” thing, unless you have had an issue with it in the past

]]> By: Noah http://blog.alwaysthenetwork.com/open-ended-questions/weekly-open-ended-question-5/comment-page-1/#comment-523 Noah Fri, 26 Feb 2010 16:01:36 +0000 http://blog.alwaysthenetwork.com/?p=739#comment-523 DTP forms trunks automatically - Switchport nonegotiate turns it off I believe. DTP forms trunks automatically – Switchport nonegotiate turns it off I believe.

]]>