Solved

Understanding Router ports and syntax

Posted on 2013-12-04
2
328 Views
Last Modified: 2013-12-05
I'm trying to understand the significance of the numbers before and after the slash.  (See graphic)

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?

router
0
Comment
Question by:brothertruffle880
2 Comments
 
LVL 35

Assisted Solution

by:Ernie Beek
Ernie Beek earned 250 total points
ID: 39695422
Let's see:

0/0 = slot/port
0/1.100 = slot/port.subinterface


Also have a look at: http://www.petri.co.il/csc_how_router_interfaces_get_their_names_on_cisco_routers.htm
0
 
LVL 18

Accepted Solution

by:
Akinsd earned 250 total points
ID: 39695701
Interface identification

My example below includes a third level (module) illustrated with Gi 0/0/0

The picture shows a router with 2 modules.
1 Module has 2 Slots, the 2nd module has 4 slots
Module 1 has a Slot with 4 Ports
1 Port can be subdivided "Virtually" in a method referred to as "Router On A Stick" into Sub-Interfaces. as described above
To create the sub-interface in your diagram. This command was issued

interface Gi 0/0.100
encapsulation dot1q 100 (The encapsulation does not have to match the subinterface but it's good practice to make it match. The encapsulation specifies which vlan that subinterface will operate on)
ip address 172.16.100.254 255.255.255.0 (I used a random IP just for illustration)

Cisco labels interfaces from right to left starting with 0 (See Picture 4 for details)

Picture1Picture2Picture3 Picture4
0

Featured Post

MIM Survival Guide for Service Desk Managers

Major incidents can send mastered service desk processes into disorder. Systems and tools produce the data needed to resolve these incidents, but your challenge is getting that information to the right people fast. Check out the Survival Guide and begin bringing order to chaos.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
How to choose hardware firewall 5 81
can't ssh to external IP 9 59
Bandwidth cap???? 8 57
Password recovery 2950 is Deleting configuration Why 8 34
Data center, now-a-days, is referred as the home of all the advanced technologies. In-fact, most of the businesses are now establishing their entire organizational structure around the IT capabilities.
Microservice architecture adoption brings many advantages, but can add intricacy. Selecting the right orchestration tool is most important for business specific needs.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
This video gives you a great overview about bandwidth monitoring with SNMP and WMI with our network monitoring solution PRTG Network Monitor (https://www.paessler.com/prtg). If you're looking for how to monitor bandwidth using netflow or packet s…

735 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question