[j-nsp] loop detection on EX4200

[Ben Dale]

On 22 Apr 2014, at 2:41 am, Victor Sudakov <vas at mpeks.tomsk.su> wrote:

> Kevin Wormington wrote:
>> Could you not use MSTP or VSTP instead of RSTP?
> 
> Perhaps I'll have to unless I can make the multiplexer forward
> untagged frames.

If the issue is that the multiplexer is not forwarding untagged frames, you'll need to use VSTP (aka PVST+).  MSTP will still send PDUs untagged.

If the issue is that the multiplexer is absorbing link-local traffic such as STP, then this is a difficult problem to solve.  I would normally suggest using something like storm-control with port shutdown, but being that this multiplexer will be max 2M of ethernet for the entire interface, tuning storm control will be quite difficult (since it is a global setting on EX42).

See if you can get something like LLDP across your multiplexer to a switch on the far side - that might point you in the direction of the issue.

Ben