Re: Router on a stick

There is something to do with vlan tag offloading, search you will find a thread from Bob

--
BR
Tony
Sent from my iPhone on 3
On 11 Nov 2012, at 09:36, Nadeem Anjum <nadeemkool_at_yahoo.com> wrote:
> Dear Experts,
> 
> After changing OS of dynamips/dynagen server from Ubuntu to
> Centos, "Router on a stick" is working perfectly.
> 
> What could be possible
> problem with ubuntu server. 
> 
> 
> 
> Thanks,
> Nadeem Anjum
>> ________________________________
>> From: Adam Booth <adam.booth_at_gmail.com>
>> To: marc edwards <renorider_at_gmail.com> 
>> Cc: Marko Milivojevic
> <markom_at_ipexpert.com>; M Nadeem Anjum <nadeemkool_at_yahoo.com>; ccie groupstudy
> <ccielab_at_groupstudy.com> 
>> Sent: Friday, November 9, 2012 6:19 AM
>> Subject:
> Re: Router on a stick
>> 
>> Hi,
>> 
>> Looking at the breakout switch config
> fragment posted, l2protocol
>> tunnelling was enabled only on the real switch
> facing interface (fa0/9)
>> anyway with nothing on fa0/48, so possible
> CDP/VTP/STP frames are being
>> encapsulated from SW2 Fa0/6 but not doing
> anything useful since there's no
>> other end to attempt to encap/de-encap those
> frames.
>> 
>> L2protocol tunnelling through the breakout switch wont do anything
> for
>> Nadeem anyway (platform limitation) but it would be quite helpful if it
>> worked to enable his routers to see the "real switches" via STP/CDP as
>> directly adjacent devices for some labs.  The 3550/3560 don't support
>> l2protocol tunelling on trunk interfaces (Fa0/48 facing the dynamips box)
>> but I believe the 3750 does.
>> 
>> Cheers.
>> Adam
>> 
>> On Fri, Nov 9, 2012 at 3:39
> AM, marc edwards <renorider_at_gmail.com> wrote:
>> 
>>> First off, you don't need
> to l2tunnel protocol anywhere to do Q in Q.
>>> 
>>> Second, you need to increase
> the system mtu on switches for additional
>>> dot1q frame size
>>> 
>>> Third,
> (with relation to Q in Q)
>>> 
>>> access ports need ONLY this
>>> 
>>> switchport
> access vlan 109
>>> switchport mode dot1q-tunnel
>>> 
>>> 
>>> trunk between
> switches only require that the vlan is allowed. or
>>> create access ports on
> same vlan between switches.
>>> 
>>> HTH
>>> 
>>> Marc
>>> 
>>> 
>>> 
>>> On Thu, Nov 8,
> 2012 at 7:51 AM, Marko Milivojevic <markom_at_ipexpert.com>
>>> wrote:
>>>> What
> happened when you tried?
>>>> 
>>>> --
>>>> Marko Milivojevic - CCIE #18427 (SP
> R&S)
>>>> Senior CCIE Instructor - IPexpert
>>>> 
>>>> On Thu, Nov 8, 2012 at
> 1:40 AM, M Nadeem Anjum <nadeemkool_at_yahoo.com>
>>> wrote:
>>>>> Dear Experts,
>>>>> 
>>>>> Can I perform "Router on a Stick" scenario using Dynamips/Dynagen
>>> Q-in-Q configuration using 4 real switches and 1 breakout switch.
>>>>> 
>>> 
>>> All switches are c3550.
>>>>> 
>>>>> Thanks,
>>>>> Nadeem Anjum
>>>>> 
>>>>> 
>>>>> Blogs and organic groups at http://www.ccie.net
>>>>> 
>>>>> 
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