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Posted by Stephen on June 18, 2008, 5:41 pm
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>
>> >
>> >> I have a basic question. When STP is putting a port in Blocking mode is
>> >> the
>> >> physical connection to the port down as well?
>> >
>> > No. The port has to stay up to keep receiving STP BPDUs even though it
>> > doesn't forward any traffic.
>>
>> So a host on the port should not notice it at all, right?
>
>Err... no, but why would a switch block a port that a host was attached
>to?
1. because someone turned on bridging in the host, and spanning tree
is doing exactly what it should as this is a loop
bridging in windows XP sometimes gives this kind of hassle, but
shouldnt be on a server....
2. the host has the same MAC address on all ports and the switch got
confused and put 1 port in err-disable (used to be common on a Sun
box)
3. 1 of the wierd mix ups that sometimes happen with link aggregation
- not setting it up on both ends, or mixing 802.1ad with cisco port
aggregation....
any more?
slightly related - latest one i seem to get is Ethernet WAN links that
reflect packets when there is an error (or when the transmission
engineers are testing - they insist on looping circuits).
cisco routers dont seem to mind too much, but a Catalyst will err
disable the port very quickly - and they dont auto recover by
default....
>
>Sam
--
Regards
stephen_hope@xyzworld.com - replace xyz with ntl
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