On 06/02/2013 18:34, m.roth@xxxxxxxxx wrote:
Les Mikesell wrote:
On Wed, Feb 6, 2013 at 11:19 AM, SilverTip257 <silvertip257@xxxxxxxxx>
wrote:
If one of your hosts intermittently loses connectivity, the switch will
broadcast that traffic to all ports because it can't find the host's MAC
address.
(And what Les said about the switch broadcasting traffic until it learns
MAC addresses.)
Some spanning tree events will force the switch to re-learn MACs too.
I should have mentioned this switch is *only* in use on our subnet, though
of course we go through it to go Out There, there are gov't firewalls
outside of it. All the traffic is only on our subnet, in this case, and
the weirdness was intermittent.
At the time, there were two heavy users (me, doing an offline backup, from
one room to another, the latter with the server being hit by me in it, and
at that switch, and another user doing heave scientific computing). That
is, of course, in addition to all the other normal traffic from dozens of
other servers.
Btw, he's not seeing it today, but I'm not running any more backups just
now....
You may have some trunking issues if you use VLANs, inter-operate these
switches with non-Cisco equipment and have left every port on the switch
in the default VLAN1.
Have you actually configured the switch, or did you just plug it in and
get running?
--
Regards,
Giles Coochey, CCNA, CCNAS
NetSecSpec Ltd
+44 (0) 7983 877438
http://www.coochey.net
http://www.netsecspec.co.uk
giles@xxxxxxxxxxx
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