Which device is responsible for finding EID-to-RLOC mapping when traffic is sent to a LISP- capable site?

Question

Options

• Amap resolver
• Begress tunnel router
• Cmap server
• Dingress tunnel router

• A
  2% (1)
• C
  4% (2)
• D
  93% (42)

Explanation

Ingress Tunnel Router (ITR) is responsible for finding the EID-to-RLOC mapping when traffic is destined for a LISP-capable site. When a host sends traffic to a remote EID, the ITR is the first LISP device to intercept that traffic, and it initiates the Map-Request process to discover the correct RLOC so it can encapsulate and forward the packet appropriately.

• Map Resolver (A) is wrong because it receives Map-Requests from ITRs and forwards them toward the correct Map Server - it facilitates the lookup but doesn't initiate it.
• Egress Tunnel Router (B) is wrong because the ETR sits on the destination side, receiving and decapsulating already-encapsulated LISP packets - it doesn't perform the mapping lookup.
• Map Server (C) is wrong because it stores and distributes EID-to-RLOC mappings on behalf of ETRs, but it responds to queries rather than initiating them.

Memory Tip: Think of the ITR as the Initiator - it's the ingress point where traffic enters the LISP network, so it logically needs to ask "where do I send this?" before forwarding anything.

No community discussion yet for this question.