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6200yl-24G-mGBIC Freezes up new fiber-optic network

Occasional Advisor

6200yl-24G-mGBIC Freezes up new fiber-optic network

I have a 6200yl-24G-mGBIC switch connected to 8 Procurve 1810G-24 switches via new 50ohm fiber-optic lines. When I power up the 6200yl switch I get steady green leds on all the ports, and a very rapid activity light on the 1810G-24 switches. However nothing can communicate across the network, I can't even ping from a server to the firewall which are both in the rack on the same switch, and it takes workstation about 4 times longer to log in, but when they do they don't see the domain. All the switches are still on factory settings, I have been using the 1810G-24 switches for almost a year on an old ethernet "daisy chained" network, but this is the first that I'm powering up the fiber. Anyone have any ideas what the problem is?
Pieter 't Hart
Honored Contributor

Re: 6200yl-24G-mGBIC Freezes up new fiber-optic network

I assume the 1810's are allready interconnected before installation of the 6200?

by default spannig-tree is disabled.
So you create loops in your network when powering up the 6200.

-> disconnect all 1810's before powering up the 6200.
- then connect a single 1810 using a single Fibre (pair).
- see network behaviour (probably all normal)
- connect a second 1810
-> now the netweork will go bezerk again
=> spanning-tree problem configred
(disconnect again)

==>> either enable and configure spanning-tree.
or disconnect the old 1810's uplink before connecting to the 6200.