On 27/04/2013 17:04, Ahmed Hilmy wrote: > CDP is at Cisco only Yes, correct. LLDP is not supported on the C7600. CDP is not supported on the SR7750. CDP and LLDP are incompatible. If you want to use a discovery protocol which will interoperate on both routers, you need to upgrade the C7600 to IOS 15.1S. Nick