Does Cisco Discovery Protocol (CDP) work with RFC 1483 encapsulation?
A. CDP support is introduced in Cisco IOS Software Release 12.2(8)T. Currently, CDP is only supported on AAL5SNAP RFC 1483 PVCs and only on point-to-point subinterfaces. Multipoint subinterface support is not planned as yet. This is an example that shows CDP on AAL5snap PVCs: Note: Router1 and Router2 are 2 7140 routers that run Cisco IOS Software Release 12.2(8)T. Router1 Router2 interface ATM4/0.1 point-to-point ip address 10.4.4.1 255.255.255.0 pvc 0/100 encapsulation aal5snap ! cdp enable interface ATM1/0.1 point-to-point ip address 10.4.4.2 255.255.255.0 pvc 0/100 encapsulation aal5snap ! cdp enable router1#show cdp interface atm4/0.1 ATM4/0.1 is up, line protocol is up Encapsulation ATM Sending CDP packets every 60 seconds Holdtime is 180 seconds router1# show cdp neighbors Capability Codes: R – Router, T – Trans Bridge, B – Source Route Bridge S – Switch, H – Host, I – IGMP, r – Repeater Device ID Local Intrfce Holdtme Capability Platform Port ID router2 ATM4/0.1 171 R 7120-AE3
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