I was asked to configure LAPB for error recovery on a PPP link the other day. I had two questions: 1) What’s LAPB? 2) How? The latter is pretty simple, the former much more complex.
First, in the interest of time, let’s talk about how this is done.
That’s it! Now, what exactly have we accomplished? By enabling LAPB we’ve inserted another layer of error-checking in our link that’s transparent to upper layers. NOTE: LAPB can only be used on unique PPP circuits, not multilinks. If you’re looking for a link quality solution for multilinks, check out LQM.