What is interface EO0/0?

Answered Question
Dec 11th, 2007

What is interface EO0/0? It seems to show up in show vtp commands and SNMP sweeps and nothing else. I'm seeing traffic on it, even though I haven't configured an interface EO0/0 in my conf.

I have this problem too.
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Hi, the EO0/0 interface is used by your switch to process VTP updates to itself bascially. It uses a loopback address 127.0.0.12 to update the switch as the first interface found. If I remember correctly the IOS has something to do with setup of EO0/0, but I don't remember alot on the subject, maybe an expert can add to my information.

HTH

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Edison Ortiz Tue, 12/11/2007 - 14:18

What type of hardware are you seeing this ?

Can you post the portion of the VTP command where you see this interface ?

Correct Answer

Hi, the EO0/0 interface is used by your switch to process VTP updates to itself bascially. It uses a loopback address 127.0.0.12 to update the switch as the first interface found. If I remember correctly the IOS has something to do with setup of EO0/0, but I don't remember alot on the subject, maybe an expert can add to my information.

HTH

Samuel8rown Tue, 12/11/2007 - 15:10

Thanks. That's what I was starting to suspect.

Interestingly, my system shows the address as 127.0.0.51 rather than 127.0.0.12, though your statement above agrees with the few examples I've been able to google up so far.

Samuel8rown Tue, 12/11/2007 - 17:49

I don't see reference in that document to EO0/0. (Though I do see reference to EOBC, which seems to be related?)

Edison Ortiz Tue, 12/11/2007 - 18:21

EO0/0 is short for EOBC0/0

Test-6503-2#sh eobc

Interface information:

Interface EOBC0/0 (idb = 0x5043D954)

Hardware is Mistral EOBC (revision 5)

Address is 0000.1100.0000 (bia 0000.1100.0000)

Encap size = 14 hardware status = 0x210840

IDB type = 18 IDB state = 4

Encap type = 0x1 Span encap size = 0

Error threshold = 5000 Error count = 0

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