Eugen Leitl wrote:
Stupid question: if I have two switches (a HP ProCurve 2650 and a
Netgear GS724T to be precise, which are both quite reasonable products
for the price tag, especially if you reflash the Netgear firmware, which
is buggy out of the box), which are both vlan-capable (it's supposedly
standartized, whatever little that means in this business),
can I make tagged vlans which span across two or more switches?
Yes. Just use the 802.1q trunking appropriately. I have networks that
pass VLAN's between Cisco, HP, Netgear and Dell switches with no problems.
Apropos of nothing, I managed to down my hoster's network segment by
an inadvertent ARP storm, made with pfSense (it's a great dual-use product,
doubles as a nuclear weapon in a pinch). I had a firewall with two interfaces
(two firewalls, in fact) on the same switch.
What you did was create a layer 2 loop, your provider obviously isn't
using STP or it would have done nothing but immediately shut down one of
the ports to cut off the loop. Shame on you a little, bigger shame on
them. In a network where you have all kinds of various customers
plugging in stuff, STP is essential - you have to protect yourself and
your customers from crap of this nature.
Moral: networking is unsuitable for dumb people.
I'm feeling nice today, no comment. ;)
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