[j-nsp] TCN guard on Juniper EX

Ben Dale bdale at comlinx.com.au
Wed Sep 11 07:45:04 EDT 2013

Hi Dennis,

The closest thing Junos has at the moment is root-guard, which would stop your Netgears assuming root for the topology, but AFAIK TCNs would still be accepted and acted upon.

Are your netgear boxes manageable?  You can't force ports into edge mode to stop this?

On 11/09/2013, at 8:18 PM, Dennis Hagens <root at ipaddr.nl> wrote:

> Hi All,
> Is there some way to filter out STP TCN BPDU's on a Juniper EX series switch?
> We have some old Netgears in our office environment (yes, I need to get rid of those) which send TCN's on edge port flaps.
> This causes a lot of reconvergence / mac table flushes on our datacenter switches, which are connected via layer 2 with the office. We currently hooked up an HP switch with TCN  guard to mitigate this, but this introduces a SPOF.
> Any ideas?
> Thanks,
> Dennis Hagens
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