Hi
I have a weird problem that I need some suggestions on:
I have an ethernet switch in one rack and a router in another rack in the same DC row.
Both pieces of equipment are connected via AC power to their own APC PDU ( in each rack )
When we racked the router, we connected the MGMT port of the router to the switch via a 5m direct ethernet cable in the aisle of the row.
we saw that the link negotiated at 100mbps and kept flapping.
we checked the config as both the switch and router have 1Gbps ethernet ports.
Both interfaces were set at auto neg and nothing defined for speed or duplex.
we swapped the 5m cable for another cable fresh from a factory baggie.
the same
we swapped the cable again
the same
we set the switch and the router to be 100Mbps full duplex and turned off auto-neg.
the link was at 100Mbps and still flapping.
We then reviewed the firmware versions on both the switch and the router and upgraded to recommended versions.
the link was still the same.
as each rack has a RJ45 patch panel back to a central cross connection frame ( that had been tested and certified on installation ), we routed the link through that structured wiring.
the link was still the same.
we then connected a direct patch between the router and another switch in another rack.
1gbps , rock solid.....
we then installed a patch between the original switch port and a laptop.
1gtbps, rock solid.
thus there seems to be a weird situation between the original switch and the router, as we linked the router and switch separately to other devices and they both worked well independently.
I open a TAC case and after review they said to check the grounding of the equipment/racks.
I have had the DC team review the rack grounding and they have confirmed that the equipment is bonded to the rack and the rack is bonded to a ground point somewhere in the DC.
the issue persists , will only auto neg to 100mbps and flaps continuously.
any suggestions?
many thanks
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