Which LISP device publishes EID-to-RLOC mappings for a site?
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Correct answer: ETR.
Why this is the answer
The Egress Tunnel Router (ETR) is responsible for publishing EID-to-RLOC mappings to the Map Server (MS). When an ETR learns about a local Endpoint Identifier (EID), it registers this EID and its own Routing Locator (RLOC) with the Map Server, making this mapping available to other LISP devices. The Map Resolver (MR) is used by an Ingress Tunnel Router (ITR) to query for EID-to-RLOC mappings, but it does not publish them. The Ingress Tunnel Router (ITR) encapsulates packets destined for EIDs in other LISP sites but does not publish mappings. The Map Server (MS) stores the EID-to-RLOC mappings but does not publish them itself; it receives them from ETRs.
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