RE: switch trunk allow vlan except 1 (valid for not allowing

From: Uchil Perera (uchil.groupstudy@yahoo.com)
Date: Sun Nov 04 2007 - 15:55:14 ART

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Hi,
   
  The question is asking you to enable "ISL" encapsulation
   
  Regards
   
  Uchil Perera
  CCIE # 18536
  

Alex Steer <alex.steer@eison.co.uk> wrote:
  Sorry to be a pain, I am aware of the vlan dot1q tag native.

I should have put the whole question. The restriction not to use a
global config command registered in my head but I assumed you are all
psychic!

Here is the exact question, word for word... almost :)
"configure etherchannel between blah blah"
"configure etherchannel between more blah blah"
"configure etherchannel between, this question is getting boring"
"Do no run PAgP or LACP on these links"
"All traffic sent over these trunk links should be tagged with a VLAN
header"
"Do not issue any global configuration commands to accomplish this
task."

Good point Scott, I don't think of either protocol as being different
with regards to the tagging/encapsulating. Clearly I keep forgetting
ISL doesn't have a native vlan. I'm sure anybodies meaning of tagged
merely means it carries a vlan number and not the technique used to
accomplish it :)

Thanks for your input everyone.

-----Original Message-----
From: Scott Vermillion [mailto:scott_ccie_list@it-ag.com]
Sent: 02 November 2007 20:39
To: Alex Steer; 'CCIE Group Study CCIE Group Study'
Subject: RE: switch trunk allow vlan except 1 (valid for not allowing
untagged packets across a trunk?)

Hey Alex,

With dot1q just do:

switch#(config)vlan dot1q tag native

And actually, that would be more correct, IMHO. "Tagged" to me means
dot1q.
ISL is "encapsulated."

Regards,

Scott

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Alex
Steer
Sent: Friday, November 02, 2007 2:05 PM
To: CCIE Group Study CCIE Group Study
Subject: switch trunk allow vlan except 1 (valid for not allowing
untagged
packets across a trunk?)

Hi,

Can anyone give their thoughts on this please?

Question:-

"All traffic sent over these trunk links should be tagged with a VLAN"

Int fa0/7

Swi trunk encap dot

Swi mode trunk

Swi trunk native vlan 1 (for completeness)

Swi trunk allow vlan except 1

The solution to this question required the configuration of the trunk to
be ISL. Being thick I forgot ISL tags all packets. Do the above
solution solve the question?

I have a funny feeling I have asked this before J

Cheers

Alex

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