I ran across a funny situation while doing a lab for my CCNP:\n\nWhile setting up 3 routers all 2620s V. 12.2(12c) for OSPF over a LAN\nI get adjacencies fine until I turn on authentication. I double\nchecked everything and had an instructor go over it and it looked all\nok to him too. The only thing that was different on the routers is\nthat 2 had BRI interfaces and one didn't. low and behold I copy the\nconfig over to another 2620 with a BRI interface and everything is\nrunning fine, why I don't know. So I came to the board for your\nthoughts.