Link between Cisco C4506-E & C2950 is down when speed & duplex is NOT Auto
I have C2950 running with 12.1(22)EA13 having uplinks connected to C4506-E (1) & C4506-E (2) 15.0(2)SG.
Speed and duplex are default settings [Speed is auto & duplex is full]. Link between C4506E(1) Gi2/35 <<-->> C2950 Gi 0/1 is negotiated to Speed 1000 & Duplex full. Whereas other link C4506E(2) Gi 2/35 <<-->> C2950 Gi 0/2 is negotiated to Speed 100 & Duplex full.
I tried to configure link C4506E(2) Gi 2/35 <<-->> C2950 Gi 0/2 manual negotiation with speed 1000 & duplex full on both the end interfaces and found link is down.
Why one uplink negotiation happened to be 100 when other is negotiated to 1000 ?
Is there any bug identified with the current running IOS.? Need help is fixing the problem.
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