can you show us the config of the cisco interface where the connection to the 6100 is working or had worked and which transceiver is used in the cisco switch?
As you are using SR SFP, you have multimode patchpanels, am i right? OM2 (~80m 10G) may be working, but OM3 (~300m 10G) would be even better. If I am right there some "enhanced" SR SFP, which support longer distances, but of course these has to be used on both sides.
Did you try to change RX and TX on one side when connecting 6100 to 6300? Maybe the Cisco Switch/SFP can automatically switch that, but Aruba not.
And last, as Gaurang311 mentioned the svlan...My 6100, 6200F, 8325, 8360 do not have the svlan option. I do not have 6300M. And I'm using 10.09.1040, Maybe svlan comes only with 10.10.xxxx. Which Software do you use on the Aruba switches?Do you have configured any vlan in the vlan trunk allowed list as a svlan? (svlan (arubanetworks.com))Are the fiber connections "dark fiber" (direct fiber from you) or are they from an service provider? I really can't believe that this is the case for a 75m connection...
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