[c-nsp] 65th VLAN

[Saku Ytti]

On (2006-11-22 13:46 +0100), Vincent De Keyzer wrote:
 
> Did anyone ever experience a very bad outage due to more VLANs than
> available STP instances? What is the behaviour of a switch (2950/3524) when
> it has exhausted its STP instances ? Does the pattern of 10+20 seconds ring
> a bell to somebody?

Well if you weren't running STP for one VLAN, there was probably infinite 
broadcast loop in that VLAN (yay for rbridges!)
If your switches only support PVST and you have strictly ring topology, you
can live bit longer with your network, if you configure at least
one switch to run STP for the VLAN.

eg. in topology:
A-B-C-A

A = VLAN 1-65
B = VLAN 66-130
C = VLAN 131-195

Very ugly, very hack, but might save you from rather large investment.
-- 
  ++ytti