[c-nsp] Cisco RSTP interop with 802.1w equipment

[Marian Ďurkovič]

On Fri, Oct 16, 2009 at 12:06:39PM +0100, Phil Mayers wrote:
> >Aren't Cisco switches supposed to send BPDUs also to IEEE STP MAC address
> 
> Generally, no. Vlan 1 is treated specially.
> 
> >on 802.1Q trunks? Or is there any special config needed for this?
> 
> Vlan number 1 will interop, so if you do this:
> 
> int Gi1/1
>   switchport mode trunk
>   switchport trunk native vlan 1
>   switchport trunk allowed vlan 1,2,3
> 
> ...then vlan 1 will form an 802.1w adjacency with the neighbour, vlans 2 
> and 3 will just pass straight through it.

Is that ultimately limited to vlan #1, or could it be done with the native
vlan on trunk (e.g. vlan #1520) as well?

We're removing vlan #1 from all trunks by principle for obvious reasons...

    Thanks & kind regards,

         M.