On 12/7/2015 5:49 PM, Chuck Anderson wrote:
On Mon, Dec 07, 2015 at 03:56:01PM -0500, Alex Aminoff wrote:
We have an office network with about 200 desks, with Dell managed 24
and 48 port switches, with spanning tree and broadcast storm
control. At the desks and carrels, we have many small 4 and 8 port
non-managed switches. Sometimes one of these small switches
malfunctions in a way that affects large portions of our network,
but intermittently. What are best practices for detecting and
pinpointing this sort of problem?
On the managed switches use features that immediately shut down a port
when a BPDU is received (BPDU Guard) or when too many MAC addresses
are learned (say more than 16 for your typical edge port). Make sure
you are capturing syslogs and/or SNMP traps so you know when a port
shuts down.
I wanted to follow up on this to say that it worked! We were able to set
up snmptrapd on our log server, and when during some scheduled down-time
we plugged in the known bad 8-port switch, we did see both syslog and
SNMP trap messages saying "Spanning Tree Protocol status Blocking" and
specifying the switch and the port. The good thing about this is this
appears to be an indicator of a problem with no false positives. So
thank you!
- Alex Aminoff
NBER
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