I would say none really.
You might want the same IOS level on both.
Do you want encryption.
Are they going to grow to more T1s or more 1841
What about backup via the Internet
We need a better defined question
How are you going to monitor it.
Do you want to control traffic both security and performance
Please let me clarify.
I have two 1841's in a lab environment.
The T1 cards are directly connected together via a cross-over T1 cable.
Both 1841's have the same IOS level.
I would like encryption.
I would like to control traffic both security and performance.
I just want an example on how to setup the two T1's and the network behind these T1's to talk to each other.