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Community Member

Excuse my ignorance - fas

I am new to cisco. I have a simple question

when you are reading something like

fas 0/0

or fas 0/1

what does the "fas" stand for? Is it relating to a ethernet interface on a router? on a switch?

or is it talking about a port on a router? on a switch?

thanks

1 ACCEPTED SOLUTION

Accepted Solutions
Purple

Re: Excuse my ignorance - fas

On a Cisco router, you only have to include as many letters in a command as it takes to make it unique. In the case of interfaces, there are no other types of interfaces that start with Fas, therefore, using the first three letters of "FastEthernet" makes it unique. Another example is 'GigabitEthernet' - you can simply type in 'Gi' to refer to those.

The 'fas' is valid for both switch and router interfaces - they use the same convention.

Hope that helps - pls rate the post if it does.

Paresh

4 REPLIES
Purple

Re: Excuse my ignorance - fas

Hi Mate,

That 'fas' is simply short for 'FastEthernet' - both routers and switches have FastEthernet ports so it could refer to either. It depends on the context in which you have seen them.

Hope that helps - pls rate the post if it does.

Paresh

Community Member

Re: Excuse my ignorance - fas

mmm I see. I think I am now up to 75% of understanding this.

Now, I will show you the context in which I have seen this. Here it is:

****************

The connections are as follows:

Router 1

fas 0/0 to Client network

fas 0/1 x-over to Router 2

ser 0/0 New WAN circuit – information to be provided by your ISP as the circuit is ready

****************

- I understood there was a router involved

- I also understood this router had few interfaces

- But I wasn't quite sure what kind of interfaces, as I am used to seeing fe0, fe1, etc

- I was thinking fas meant something like Frame Alignment Signal (I looked it up on google :) )

- So, my 2 questions now are, why the use of fas? (what or where does it come from?)

- and, just like you said, these just mean plain ethernet interfaces on a router or a switch????

thanks

Purple

Re: Excuse my ignorance - fas

On a Cisco router, you only have to include as many letters in a command as it takes to make it unique. In the case of interfaces, there are no other types of interfaces that start with Fas, therefore, using the first three letters of "FastEthernet" makes it unique. Another example is 'GigabitEthernet' - you can simply type in 'Gi' to refer to those.

The 'fas' is valid for both switch and router interfaces - they use the same convention.

Hope that helps - pls rate the post if it does.

Paresh

Community Member

Re: Excuse my ignorance - fas

Now I am not 100%, but 300% of understanding this.

I was so lost that I almost went out to buy a book about it because I couldn't find nothing close to it on the internet until I remember about the forums...

Few days ago I was given a project that involves cisco terminology which ended up landing me here.

I think I might have some other questions but I will post them in a new thread

once again, thank you very much Paresh

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