Connect S4048F (OS9) and S5248F (OS10) via 40Gb QSFP

I've got a pair of "old" Top of Rack switches (4048's) that I'm trying to link with a pair of new ones (5248's) with Dell branded 40Gb QSFP Cables to allow for a gradual migration of connected hardware. When I connect even a single cable the port, the interface comes up (now that I've added the line "intf-type cr4 autoneg" to the 4048 interfaces - that took some finding!) but immediately goes into a spanning tree "blocking" state and no traffic is passed - regardless of config.

The end game to have two cables in a Trunked Port Channel to handle the required VLANs, but we've simplified it down to a single cable that's configured as an access port on each end for a VLAN that doesn't exist anywhere else on the network, and it still blocks all traffic?

Any ideas?

Responses(1)

DELL-Chris H

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July 29th, 2024 19:07

Jack.eales,

Normally we don't support initial configuration, but I would start with looking for other ports that are passing all VLANs, and may be why these go to a blocking state. It may also be that it is working correctly, but you may have a potential loop. You could also try turning off spanning tree and see what happens. Lastly, a network diagram and knowing which type of spanning-tree may also be helpful.

If not then you may need to call in for initial configuration support.

Let me know if this helps.

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Connect S4048F (OS9) and S5248F (OS10) via 40Gb QSFP