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350-401 · Question #496

What is the function of the LISP map resolver?

The correct answer is C. to decapsulate map-request messages from ITRs and forward the messages to the MS.. The LISP Map Resolver (MR) acts as a central proxy for Ingress Tunnel Routers (ITRs) to query for EID-to-RLOC mappings, forwarding these requests to the appropriate Map Servers.

Submitted by parkjh· Mar 6, 2026

Question

What is the function of the LISP map resolver?

Options

  • Ato send traffic to non-LISP sites when connected to a service provider that does not accept
  • Bto connect a site to the LISP-capable part of a core network publish the EID-to-RLOC mappings
  • Cto decapsulate map-request messages from ITRs and forward the messages to the MS.
  • Dto advertise routable non-LISP traffic from one address family to LISP sites in a different address

How the community answered

(24 responses)
  • B
    4% (1)
  • C
    88% (21)
  • D
    8% (2)

Why each option

The LISP Map Resolver (MR) acts as a central proxy for Ingress Tunnel Routers (ITRs) to query for EID-to-RLOC mappings, forwarding these requests to the appropriate Map Servers.

Ato send traffic to non-LISP sites when connected to a service provider that does not accept

Sending traffic to non-LISP sites typically involves a Proxy Egress Tunnel Router (PETR) or a LISP-to-non-LISP gateway, not the Map Resolver.

Bto connect a site to the LISP-capable part of a core network publish the EID-to-RLOC mappings

Connecting a site and publishing EID-to-RLOC mappings are functions of an xTR (Ingress/Egress Tunnel Router) and a Map Server (MS), respectively, not the specific role of the Map Resolver.

Cto decapsulate map-request messages from ITRs and forward the messages to the MS.Correct

The LISP Map Resolver's primary function is to receive EID-to-RLOC map-request messages from ITRs, decapsulate them, and then forward these requests to the designated Map Server (MS) that is authoritative for the requested EID prefix, facilitating dynamic routing lookup.

Dto advertise routable non-LISP traffic from one address family to LISP sites in a different address

Advertising routable non-LISP traffic to LISP sites is a function related to the xTRs' inter-networking capabilities or LISP gateway functions, not the Map Resolver's core role in handling map-requests.

Concept tested: LISP Map Resolver function

Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_lisp/configuration/xe-16/irl-xe-16-book/irl-overview.html

Topics

#LISP#map resolver

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