"Ants" <antzj@hotmail.com> a écrit dans le message de
news:1de76cae.0403120143.7fa2368b@posting.google.com...
> Hi,
> Have the follwoing scenario...
>
> Csico 2950 switches (sw1-6)
>
> sw1 connects to sw6
> sw1 connects to sw2
> sw1 connects to sw3
> sw3 connects to sw4
> sw4 connects to sw5
> sw6 connect to firewall onto internet.
>
> recently installed sw5 and 6 and since installation having a problem
> with a few servers (cros connected on sw1, sw2 and sw3) which seem to
> drop of the network intermittently for a minute or so then back
> again...
>
> am i breaching the 'ethernet' rules?
> sw5/6 config very basic default.. int set to full/100 with
> 'spanning-tree extend system-id' only command configured...
> could this be a spanning tree problem?

Seems like a spanning tree problem to me. :o)
when you do a 'show spanning-tree' on sw5 or sw6, do they say that they are
the root bridge for a vlan?

imho, I would suggest to force a switch to be a root bridge.
For instantce on sw1, I would type 'spanning-tree vlan 1 root primary'
On sw3, I would type 'spanning-tree vlan 1 root secondary'
I assumed that sw1 is your -best- switch (i.e. biggest hardware platform
with best connectivity) and sw3 is your -second best- switch.

If you are using more than 1 vlan, I woudl also suggest to use VTP.

--
Choowie.

"choowie" <choowie@withoutSPAMnerim.net> a écrit dans le message de
news:c2so0v$13aa$1@biggoron.nerim.net...
<snip>
> For instantce on sw1, I would type 'spanning-tree vlan 1 root primary'

btw, typing "spanning-tree vlan 1 root primary" on a switch wich is not root
will make you network unavailable for some seconds again. So be careful, end
users might hate you at the end of the day :o/

--
Choowie.