From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Oct 01 2003 - 22:02:41 GMT-3
Bingo!!!
I knew that there would be some very smart guy out there who could explain
this in a way I could understand.
Thank you so much. You really helped me out. I had looked and looked at
the solution but it never clicked until you explained it.
dt
----- Original Message -----
From: "Chip Nielsen" <chipn@intraworx.net>
To: "'ccie2be'" <ccie2be@nyc.rr.com>; "'Group Study'"
<ccielab@groupstudy.com>; "'asadovnikov'" <asadovnikov@comcast.net>
Sent: Wednesday, October 01, 2003 8:36 PM
Subject: RE: 3550 reconciling requirement to solution
> Sorry for the confusion.
>
> Although this solution does not use "vlan dot1q tag native", I think it
> would also be acceptable as a solution to this task.
>
> The solution below prevents untagged traffic by not allowing vlan 999 on
> the trunk. The command "switchport trunk native vlan 999" changes the
> native vlan on the trunk, hence all of the ALLOWED VLANs would be
> tagged. Remember, only the NATIVE vlan is untagged. Since the native
> vlan has been changed from vlan 1 to vlan 999, traffic on vlan1 would be
> tagged crossing the trunk because vlan 1 is no longer the native vlan.
>
> Make sense?
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Wednesday, October 01, 2003 5:27 PM
> To: Group Study; asadovnikov
> Subject: Re: 3550 reconciling requirement to solution
>
> I'm sorry. I clicked "send" too soon and forgot to include the solution.
> I
> sent the solution right afterwards. And, in the solution, there's no
> command like "dot1q tag native".
>
> interface Port-channel1
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 999
> switchport trunk allowed vlan 1,10,20,30,40,55,70,100
> switchport mode trunk
> no ip address
>
> interface FastEthernet0/23
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 999
> switchport trunk allowed vlan 1,10,20,30,40,55,70,100
> switchport mode trunk
> no ip address
> udld enable
> channel-group 1 mode on
> !
> interface FastEthernet0/24
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 999
> switchport trunk allowed vlan 1,10,20,30,40,55,70,100
> switchport mode trunk
> no ip address
> udld enable
> channel-group 1 mode on
>
>
> ----- Original Message -----
> From: "asadovnikov" <asadovnikov@comcast.net>
> To: "'ccie2be'" <ccie2be@nyc.rr.com>; "'Group Study'"
> <ccielab@groupstudy.com>
> Sent: Wednesday, October 01, 2003 6:59 PM
> Subject: RE: 3550 reconciling requirement to solution
>
>
> There is a command on 3550 ("dot1q tag native" or something alone this
> lines) which will make 3550 to send frames on the native VLAN of dot1q
> trunk
> with the tug.
>
> Best regards,
> Alexei
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Wednesday, October 01, 2003 6:30 PM
> To: Group Study
> Subject: 3550 reconciling requirement to solution
>
>
> Hi,
>
> 2 3550's are connected back to back via Fa0/23 and 0/24 ports on both
> Cat's.
>
> The requirement is this:
>
> Config the 2 interfaces (Fa0/23 and Fa0/24) connecting the 3550's to
> appear
> as 1 link to STP....
>
> This link should allow all vlan's to travel across with their vlan ID
> intact. You can not use Cisco's proprietary protocol to achieve this.
> Every
> packet that traverses the link must have the vlan ID, no exceptions.
>
> I'm OK with everything except the last 2 words, "no exceptions". Since
> we
> can't use ISL, 802.1q has to be used, but that means packets in the
> native
> vlan aren't tagged and thus don't have a vlan ID. The solution is
> below,
> but I'm hoping someone can explain how that solution meets the above
> requirement and maybe what would be a good way to think through this
> problem.
>
> Thanks, dt
>
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