After the connection between two switches could not be established I went to see the log of the uplink switch and the first thing I have noticed was this: %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up %SPANTREE-7-RECV_1Q_NON_TRUNK: Received 802.1Q BPDU on non trunk FastEthernet0/1 VLAN300. […]

Make Cisco device and non-Cisco SFP “work” together

Maybe you came across a problem where you have a Cisco switch worth a few thousand dollars but you just don’t have a Cisco SFP which is also not cheap or it had malfunctioned and you are looking for an alternative. I have recently encountered that kind of situation (the first one) but there is […]

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