Hot!Fortiswitch FS-124E to Cisco 3750X via SFP - No Connection

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Joe667
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2019/09/17 12:47:33 (permalink)
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Fortiswitch FS-124E to Cisco 3750X via SFP - No Connection

I have a new FS-124E running Firmware 6.2.1 and am trying to communicate with a Cisco 3750X running IOS 12.2(55)SE3 via SFP ports. I have configured the FortiSwitch as a stand alone. Connecting from RJ45 to RJ45 between the switches, the communication is fine and my configs work. The ports used for communication are both set as trunks. The port config on the Cisco RJ45 is identical to the config on the SFP port on the Cisco, with one exception. The link on the Cisco SFP port is down/down unless I enter the speed nonegotiate command. This brings up the link light on the Cisco and the show interface for the SFP port is up/up. Still no communication. I have confirmed my FortiSwitch transceiver is on the compatibility list. I am using a proven fiber cable, a proven Cisco transceiver and a proven port on the Cisco switch. All diagnostic commands show no alarms or errors. The log provides no clues.
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    Joe667
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    Re: Fortiswitch FS-124E to Cisco 3750X via SFP - No Connection 2019/09/18 12:55:36 (permalink)
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    SOLUTION
    It appears that in 6.2 there is a problem with the trunking over SFP. I solved the problem by leaving my SFP port out of the trunk setup and adding all VLANs to the Allowed VLANs for that particular port.
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