Necessities
Usually, you have to use two SFPs which are suitable with the identical Ethernet variant (velocity, wavelength, fiber kind). Each the J4859D and the MGBLX1 are operating 1000BASE-LX(10), in order that’s not your downside.
Please test the switches’ logs to see in the event that they’ve accepted their respective transceiver. allow-unsupported-transceiver
is just vital on the 2930 for non-HP transceivers (=MGBLX1), the J4859D ought to work with out. When an inserted transceiver is accepted, the port LED lights up for appr. one second. If it is not accepted, the LED retains blinking.
If every swap has accepted its transceiver, the one factor left is to make use of the proper cable. 1000BASE-LX runs over single-mode fiber. Only for completeness, fiber cables are usually crossed, ie. the left-hand transmitter wants to hook up with the associate’s right-hand receiver and vice versa.
Some long-range transceivers could require an attenuator on quick hyperlinks to keep away from blinding the receiver, however that isn’t an issue right here.
Primary troubleshooting
You will need to be aware whether or not the hyperlink LEDs gentle up on cable insertion (=layer 1 up). Equally necessary are log occasions on transceiver and cable insertion.
If all the pieces fails, you may take a look at a single transceiver by having it hyperlink to itself with a easy loopback cable (=simplex cable). Most duplex cables could be break up for use as two simplex cables. In fact, you have to ensure that that does not trigger a community loop – configure a spanning tree protocol or use solely an in any other case empty VLAN on the hyperlink.
And naturally, any configuration on the swap interfaces or VLANs have to match – by default, they need to speak to one another. To test primary layer-2 connectivity you may show the MAC desk (for the respective VLAN) on the linked port.
The Cisco Enterprise 350 collection appears to be managed, so you must test their config as effectively.