Difference between S0, S0/0, S0/1, etc...

[jsingh7]

I understand that on a Switch, E0/3 would mean Slot 0 and Port 3... or F0/26 would be FastEthernet Slot 0, Port 26. However, what does it mean on a router? Meaning, if it says Interface S0/0 or S0/1 or S1/2... what does that mean?

On a 2600 Cisco Router, I've seen interfaces being configured as S0, and S0/1... So those are 2 different interfaces? Someone please explain...

J.S.

 

[wybnormal]

IT depends on the cards used. For example, if the card has a single interface on it.. serial 0 or S0. If the card has 4 serial interfaces.. S0/0, S0/1, S0/2 and S0/3. If you have two cards with two interfaces.. S0/0 and S1/0 and s0/1 and S1/1

etc...etc..etc..

slot and port.

MikeS
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[RMAKing]

If the interface has a slash in it (/) that indicates it is modular and the first number indicates slot, the second port. If it just has one number with no slash (s0, s1, etc.) it means they are fixed ports and not modular (like 2500 series).