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New Member

Fiber connection between two switches

Hi All,

Here is the situation, I have two switches which are SF200 and SG300 and trying to link them up using sfp module ( fiber).

They are both in trunk mode and the connection is up but nothing or no ip traffic goes through it .

I have ensured allowed vlans are correct, native vlan do match but still nothing .

Then i did a port monitor on it ( replicate it to another port) but all I could see was bunch of stp,arp , mdsn and llc traffic. nothing to do with do1q extension.

I used wireshark , would I be able to monitor trunk traffic at all? would the protocol be dot1q ?

However the fiber link works if I plug one of the connection which goes to the sg300 to a fiber convertor and then connect a rj45 cable from the convertor to the sg300 rj45 port. that is the only way which it works. This suggest to me a possible issue with the fiber module on the sg300 however I have tried few differnet modules and still nothing , I did even try the one which is on the sf200 ( working ) and still nothing .

What boggles me is the fact that the link is seen as up and all good by both switches but nothing does go through them.

Any one know what the cause could be ?

Thanks

4 REPLIES
New Member

Fiber connection between two switches

I should add it is just one of our sfp modules which we normally buy from level1 so nothing recommanded by cisco .

New Member

Fiber connection between two switches

any one ?

Hall of Fame Super Gold

Fiber connection between two switches

Wrong forum, post in "Small Business switches". You can move your posting with the Actions panel on the right.

Green

Fiber connection between two switches

What model GBIC do you use?

-Tom
Please mark answered for helpful posts

-Tom Please mark answered for helpful posts http://blogs.cisco.com/smallbusiness/
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