Hi R1 and R2 are connected by serial links, with IPV6 address global unicast and link-local every link.I can do ping between them. When I do ping to link-local address next router, I need to specify outgoing interface, ping is succesful.However I can...

  HiI have a switch WS-C2960S-24PS-L. I am trying upgrade from c2960s-universalk9-mz.122-55.SE8.bin to c2960s-universalk9-mz.150-2.SE5.bin.But when boot appears "no such device".Similarly I am trying downgrade to c2960s-universalk9-mz.122-55.SE3.bin ...