Cisco is known for the inconsistencies between platforms and different IOS versions. I came across another that was rather annoying. Now between linecards.
Trying to configuring the following standard sub-interface Ethernet AToM tunnel on a Cisco 7606 with a ES+ linecard:
pseudowire-class CISCO encapsulation mpls ! interface Te2/2.2 encapsulation dot1Q 2 no ip redirects no ip directed-broadcast no ip proxy-arp xconnect 10.5.0.99 12345 encap mpls pw-class CISCO
Yields the following misleading error…
7606(config)#int te2/2.2 7606(config-subif)# xconnect 10.5.0.99 12345 encap mpls pw-class CISCO MPLS encap is not supported on this circuit