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June 30th, 2014 13:00
Connection between two switches connected by L2 layer link is not functional
As a part of my network, I have two switches PowerConnect 6248P connected in trunk mode with several VLANs defined, including one for workstation and one for voice. These two switches are connected with a regular patch cord.
I have to move urgently one switch in another building, I already have a L2 link between the 2 IT rooms (leased line from telco operator). When I connect the two switches using this L2 link, keeping the same configuration on the two switches, the network is not functional anymore. The desktops and phones (all with fixed IPs) connected to the switch that was moved cannot connect to the network.
When inspecting the network traffic, on a desktop connected to the moved switch, we see ARP requests that don't get answers. I had two network engineers working on the issue, and they are puzzled by the fact it doesn't work.
Any idea of where to look ? I don't have enough time to deploy a L3 routing connection between the two locations, which is the next step, but I really need to make this temporary solution work.
Thanks,
Vincent
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DELL-Josh Cr
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June 30th, 2014 15:00
Hi Vincent,
These switches were not designed to be used across a layer 2 link, so there might be something causing an incompatibility. Is the layer 2 link using Ethernet or is at another layer 2 protocol such as PPP?
vbiache
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June 30th, 2014 22:00
Hello Josh,
The layer 2 link is using Ethernet. We were able to connect one switch on the end of the link, and one computer on the other hand, and it worked perfectly fine.
Thanks,
Vincent
DELL-Josh Cr
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July 1st, 2014 08:00
Does the switch to PC work with both switches? Did anything change with the configuration of the switch that relocated? You could try copying out the config, clearing it and restoring it. You may also want to make sure the firmware is up to date http://www.dell.com/support/home/ca/en/cabsdt1/Drivers/DriversDetails?driverId=Y7YJ9&fileId=3354403342&osCode=NAA&productCode=powerconnect-6248p&languageCode=EN&categoryId=NI