CCNP SP MPLS FAQ:MPLS and ATM Architecture
Q1. In what ways is an ATM LSR different from a frame-based LSR?
- 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 LDP?
Q3. What is the preferred control mode for LDP on the ATM LSRs?
Q4. Name two ways that LDP can detect loops.
By means of a Hop Count TLV
By means of a Path Vector TLV
Q5. Which two features must an ATM switch have in the control plane to become an ATM LSR?
Q6. Which label space is used on an LC-ATM interface?
Q7. What IP precedence values are by default mapped to the standard LVC type with Multi-VC TBR?
Q8. What would be the reason to disable the head end VCs on an LSC?
Q9. Why does the Cisco equipment not advertise bound IP addresses of the LSR on LC-ATM interfaces with LDP?
Q10. What is the advantage and disadvantage of VC-Merge?