CCNP SP MPLS FAQ:MPLS and ATM Architecture Q1. In what ways is an ATM LSR different from a frame-based LSR? Answer: The label value is encoded in the VPI/VCI fields. ATM LSRs forward cells. ATM LSRs are not capable of decrementing the TTL. LDP runs in Downstream-on-Demand label advertisement mode on ATM LSRs. Q2. What is the default control VC for … [Read more...]