Home » Cisco » 400-201 » Which action does the MR/MS take after it receives the query for 10.2.1.10?
Refer to the exhibit. The ITR map cache is empty. The ITR receives a packet destined for 10.2.1.10 and it sends query to the MR.
Which action does the MR/MS take after it receives the query for 10.2.1.10?
A. The MR sends a map reply to the requesting ITR with address of 172.17.1.1 as the ETR for 10.2.1.0/24
B. The MR forwards the map notify request to the ETR responsible for the EID 10.2.1.0/24
C. The MR forwards the map request query to the ETR responsible for the EID 10.2.1.0/24
D. The MR sends a map notify to the requesting ITR with address of 172.17.1.1 as the ETR for 10.2.1.0/24
Correct Answer: C
Explanation/Reference:
ITR Ingress Tunnel Router
ETR Egress Tunnel Router
Map Resolver (MR) A Map-Resolver is a LISP infrastructure device to which LISP site ITRs send LISP Map-Request queries when resolving EID-to-RLOC mappings.
Map Server (MS) A Map-Server is a LISP infrastructure device to which LISP site ETRs register with their EID prefixes. The Map-Server advertises aggregates for the registered EID prefixes to the LISP mapping system. All LISP sites use the LISP mapping system to resolve EID-to-RLOC mappings Endpoint Identifier (EID) addresses EID addresses consist of the IP addresses and prefixes identifying the endpoints. EID reachability across LISP sites is achieved by resolving EID-to-RLOC mappings.
Route Locator (RLOC) addresses RLOC addresses consist of the IP addresses and prefixes identifying the different routers in the IP network.
Reachability within the RLOC space is achieved by traditional routing methods.
Map- Notify LISP message used by an xTR that has detected an EID to update the other xTRs in the same LISP site about that discovery. It also used by the map-server to confirm that a mapregister has been received and processed.
