11-14-2022 08:30 PM
Why cisco uplink interface not coming up on auto mode but on 100 mpbs hardcoded.
11-14-2022 08:54 PM
what switch model are you using on both sides? have you checked both switch's port speed and duplex config?
11-14-2022 09:03 PM
one side is cisco 1941 router and other side is 3850 switch. Both have Gig Ports and tried all speed and duplex combinations. if i keep auto speed and duplex setting then port is not coming up. Both its coming up on 100 Mbps hard coded
11-14-2022 10:46 PM
If the patch cable used to connect the router and the switch only has Pairs A and Pairs B, then the port will only negotiate to 100 Mbps.
NOTE: Do not bother to run a TDR from a 3850 because there is a TDR bug and will affect reliability.
11-14-2022 11:57 PM
In that case will interface remain down if speed is auto
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