it could be any reason that need to have proper troubleshoot.some useful debug that may give you some idea what could be wrong but use with caution that may cause high CPU and other side effect.debug vpdn ev debug vpdn err debug l2tp eve debug l2tp e...

Yes - there are different types of session (ppp or l2tp) limitation based on the combination of what kind of RP (RP1 vs RP2) or/and ESP types.for ASR1002 with RP1 and 5-Gbps ESP module should be able to support - 12,000 ppp sessions and 6,000 Layer 2...