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# Deciphering Routers in a N/W Visio diagram

Posted on 2013-12-02
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I understand that the top IP address is the address of the router. But what do the numbers and letters underneath represent.  Co-workers on holiday vacation and have no one to ask.
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Question by:brothertruffle880
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ibrahim52 earned 2000 total points
ID: 39690749
that is interface type. gi = Gigabit Ethernet;
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Assisted Solution

ibrahim52 earned 2000 total points
ID: 39690754

http://www.cisco.com/en/US/products/hw/routers/ps282/products_tech_note09186a008035b051.shtml
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Author Comment

ID: 39690778
Okay.  I got the Gigabit Ethernet part.
What does the 0/0, 0/1.100 and 0/2 mean?
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LVL 12

Expert Comment

ID: 39690826
Those are FastEthernet interface.
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Author Comment

ID: 39690894
I'm trying to understand the significance of the numbers before and after the slash.

The three sets of numbers surrounding the router I'm trying to understand are:
0/0
0/1.100
0/2

What do these combinations of numbers mean?
0

Expert Comment

ID: 41516425
On cisco routers you can have multiple interfaces on a single card and you can install multiple cards in the chassis so Gi 0/0 Gi 0/1 and Gi 0/2 are referring to individual Gigabit interface ports 0 1 and 2 on the card that is in slot 0.
The .100 (0/1.100) is a subinterface, this is a virtual interface that can be created from a physical port for the purpose of routing between vlans

Real Gigabit port       0/1
Subinterface     0/1.100 (maybe vlan 100)
Subinterface     0/1.200 (maybe vlan 200)
etc

HTH
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