there is some limitation to configure EtherChannel on cards WS-X4606-X2-E and WS-X4306-GB using TwinGig converters?
Limitation of using twingig converter is in a Supervisor Engine 6-E system, the ports are connected to the switching engine through a stub ASIC. This stub ASIC imposes some limitations on the ports: Gig and 10 Gig ports cannot be mixed on a single stub ASIC; they must either be all 10 Gig (X2), or all Gig (TwinGig Converter and SFP).
Check out the below link
http://conft.com/en/US/docs/switches/lan/catalyst4500/12.2/50sg/configuration/guide/sw_int.html
Hope to Help !!
Ganesh.H
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