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Home > Archive > CCNP > February 2004 > looking for some help.
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looking for some help.
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| ZacDogg 2004-02-17, 7:32 pm |
| I remember this tripping me up when I learned frame-relay too. I'll try to give you an explaination of a DLCI's local significance. Say you have a hub site A and 3 remotes X, Y and Z. Site A's DLCI to X is 100, to Y is 101, to Z is 102, and all the remotes, X,Y,Z, are 100 to A. What the DLCI is really there for is when the frame switch receives a frame from the circuit connected to A and see's DLCI 100 is knows to send it to X, 101 to Y, etc... All the remotes can also use 100, or whatever they want, because they are connected to different frame switches and beyond that different circuits on different frame switches.
Imagine having a hub router the is connecting to 100 remotes using frame-relay. You send all the traffic to the remotes on the same access circuit, but with different DLCI's. When the frame switch gets that traffic is knows by the DLCI where the traffic is destined to. DLCI 200 needs to go to circuit xxxxxxxx in Atlanta, DLCI 201 needs to go to ciruit xxxxxxx in Minneapolis, and so on and so on.
I hope this helped, but fear it may have confused you more.
Zac | |
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| No, that definately does help, Thanks! But, another question: Can you have, on that site A in your example, the same DLCI say for site X and Y? So, if I config site A's router, can those DLCIs be the same for site X and Y? | |
| ZacDogg 2004-02-17, 9:27 pm |
| Maybe. You can use the same DLCI as long as they are on different circuits. If they're are say two subinterfaces on the same circuit then no, you can't. The whole thing is, that is how the frame switch makes it's determination on where to switch the data to. The frame switch knows that if it receives traffic on this circuit and it is DLCI 100 send to X, 102 send to Z. If they are on different circuits then yes you can use the same numbers.
Zac | |
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| ZacDogg, thanks a bunch man! You cleared it up for me when no one else would. Thanks. I appreciate all you help. |
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