We had a Cisco 6506 with 1 gig LH transceivers 1310nm that were working with service provider 1550nm optics. Well when we went to change out switch with newer one we couldn't get transceivers to consistently go into up state. It was then discovered b...

Went to upgrade 3850 T stack with 3.6.8 latest recommended goldstar and GRE tunnel command disappeared and crashed backup member into ROMMOM mode.   Went to enter   int tun 0 command and received message gre no configurable by user in wan, or underne...