From: Balaji Siva (bsivasub@gmail.com)
Date: Mon Jan 09 2006 - 05:03:37 GMT-3
STP is always recommended for L2 links to avoid unecessary loops.
If there only one link, there is loop, so STP can be technically turned off
but not recommended in real world.
If there is 2 links and there is a physical loop for a specific vlan, then
STP is needed. If one vlan is going on 1 link and another vlan is going on
another link, it is not needed technically.
You have everything right except the case with 2link etherchannel on access
mode, it is not required technically.
HTH
Balaji
On 1/8/06, lim es <tiga72@yahoo.com> wrote:
>
> Hi Group,
>
> I am still pretty shaky on STP concepts. I know in
> short, it is needed to provide a loop-free path in
> multiaccess networks, have it thought over, i've laid
> out some scenario, i am not too sure if i got it
> correct, would sure appreciate some advice
> on this.
>
> Suppose we have
>
>
> [sw1]-------[sw2]
>
>
>
> sw1 & sw2 etherchannel(L2) mode Need STP?
>
> 1 link NA Access Required
>
> 2 links no Access Required
>
> 2 links Yes Access Required
>
> 1 link NA Trunk Not required
>
> 2 links no Trunk Required
>
> 2 links Yes Trunk Not required*
>
>
> L2: Layer 2 aggregation
>
> * switch will look at it as a single link, hence STP
> not required.
>
> All Layer 3 inplementation of etherchannel will not
> need to run STP
>
>
>
> Please correct me if i am wrong
>
> Thanks
>
>
>
>
> __________________________________________
> Yahoo! DSL Something to write home about.
> Just $16.99/mo. or less.
> dsl.yahoo.com
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Wed Feb 01 2006 - 07:45:47 GMT-3