Hello All, Sorry for the off topic . But I can't seem to find anything (that I can get to) about conflicts between 11.x & 12.x PPP implementations . I have a customer running ios 11.1 sync serial encaps ppp & his provider that is running 12.04(?) with proper config on his end & his end of the link shows (supposedly)UP My end on the other hand show all signals UP but protocol down :-{ . actually afaik the provider changed IOS version down one minor level (12.04 I beleive) & rebooted the system & the encaps just won't sync . Tia, JimL +-----------------------------------------------------------------+ | James W. Laferriere | System Techniques | Give me VMS | | Network Engineer | 25416 22nd So | Give me Linux | | babydr@baby-dragons.com | DesMoines WA 98198 | only on AXP | +-----------------------------------------------------------------+