A service provider is deploying L2VPN LAN services in its MPLS cloud. Which statement is true
regarding LDP signaling and autodiscovery?
A.
LDP signaling requires that each PE is identified, and that an LDP session is active with its P
neighbor for autodiscovery to take place.
B.
LDP signaling requires that each P is identified, and that a targeted LDP session is active for
autodiscovery to take place.
C.
LDP signaling requires that each PE is identified, and that a targeted LDP session with a BGP route
reflector is active for autodiscovery to take place.
D.
LDP signaling requires that each PE is identified, and that a targeted LDP session is active for
autodiscovery to take place.
LDP signaling requires that each PE is identified and a targeted LDP session is active for
autodiscovery to take place. Although the configuration can be automated using NMS/OSS the
overall scalability of the solution is poor as a PE must be associated with all other PEs for LDP
discovery to work, which can lead to a large number of targeted LDP sessions (n2), which may be
largely unused as not all VPLS will be associated with every PE. The security attributes of LDP are
reasonably good, although additional configuration is required to prevent unauthorized sessions
being set up. Although LDP can signal additional attributes, it requires additional configuration
either from an NMS/OSS or static configuration.
http://www.cisco.com/en/US/products/hw/routers/ps368/products_white_paper09186a00801f6084.
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