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Question : Problem: Ethernet Line Protcol?
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On Cisco routers and switches the ethernet interface will show the interface status is up once link status is seen. But what causes the line protocol to go up on a full duplex ethernet interface?
Ethertype 9000 defines CTP but that assumes Ethernet v2 is being used and it would only function in a coax or hub environment.
I've also read:
http://www.cisco.com/en/US/tech/tk827/tk369/technologies_tech_note09186a008048cffc.shtml#t3
Where it states "The Ethernet hardware sends this packet onto the Ethernet wire and then immediately receives this packet back again."
But on a full duplex link, it won't see it return. Debug confirms this as I can see the frame being transmitted but not received by a switch port.
Also, I haven't seen any of these frames coming out of typical workstation which means the switch port connected to a PC would never receive the keepalive and SHOULD then show the line protocol as down.
So what mechanism does Cisco use to indicate the line protocol is up?
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Answer : Problem: Ethernet Line Protcol?
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