Hi Avinash, I'd been using VPI=0 ,am following http://joshatterbury.com/labs/sp-workbook/ , stil this crashes when i ping to the ATM interface. I couldnt locate c7200-k91p-mz.122-25.S15 IOS, but could find c7200-k91p-mz.122-25.S9; should try with this today. Thanks