ATM on Cisco 2911

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Jul 22nd, 2010
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we want to change our old routers with the new Cisco 2911.

We use ATM, on the cisco 2911 datasheet ATM encapsulation is supported but I can't find a document where is explained the possible ATM configurations.

Anyone can help me to get this informations?

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Mohamed Sobair Thu, 07/22/2010 - 04:00
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Here is an example:

interface atm0/0.1 point-to-point

ip address

pvc 1/100

protocol ip broadcast

encapsulation aal5snap



acleri Thu, 07/22/2010 - 04:18
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Mohamed, thank you for your answer.

I bad explain my request, I'm trying to find any information about the ATM capabilities of the 2911 but on the cisco web site I simply found that they support ATM encapsulation.

What kind of ATM mode is able to support this new router?

Do you know it or do you have any usefull documentation?


acleri Thu, 07/22/2010 - 07:59
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but on the datasheet ATM encaspulation is supported.

This does it mean that is possible to configure atm on normal E1 interface.

I don't know ATM, do you know what's the difference between having specific ATM modules and to enable ATM encapsulation on a simple E1 interface?

What kind of limitations do I have on the 2911?

Thank you.


Mohamed Sobair Thu, 07/22/2010 - 12:26
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E1 is different Module with different encapsulation type than ATM. E1 is asynchronous serial interface and the encapsulation associated with it is PPP or HDLC.

atm on the other side has different type of interfaces that supports (E3, STM1 , STM4 , STM16 and STM10) capacity and the encapsulation type is totally different that what is used in serial interfaces like E1, the encapsulation type in ATM is a telco dependant but we usually have here (aal5snap).

I have checked the Module type supported on ISR 2911, however, atm modules are not supported on this series.

The short answer is that you cant have atm encapsulation type on the serial interface.

You might also confirm it with Cisco support just to confirm...




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