[c-nsp] STP and PVST..

[Sebastian Wiesinger]

* Gert Doering <gert at greenie.muc.de> [2017-04-20 16:19]:
> Hi,
> 
> On Thu, Apr 20, 2017 at 12:10:21PM +0000, Scott Granados wrote:
> > Oh boy, I???ve seen that 253 VLAN thing bite a big customer in the 
> > back side.  You add number 254 and whammo!  
> 
> What exactly happens then?  (We currently only use juniper at the edge,
> where no single switch has more than ~40-50 VLANs, so the risk has
> been small :-) )

Well, on Juniper it just fails:

[edit protocols vstp]
  'vlan all'
    Cannot configure VSTP on all VLANs when more than 253 VLANs are configured.
Configure vstp vlan-group along with STP or RSTP to cover all VLANs
[edit protocols]
  'vstp'
     Failed to configure vstp on all vlans
error: configuration check-out failed


Regards

Sebastian

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