Protocol (LISP) is a simple, incremental, network-based protocol designed to
implement separation of Internet addresses into Endpoint Identifiers (EIDs) and
Routing Locators (RLOCs).
LISP stands for
Locator/ID Separation Protocol and is a next-generation IP routing feature that
creates a new paradigm in how IP addressing is assigned and interpreted by
splitting the device identity, known as an endpoint identifier (EID), and its
location, known as its routing locator (RLOC), into two different namespaces.
Creating separate IP addresses for EID and RLOC functions yields several
advantages, including improved scalability of the routing system through
greater aggregation of RLOCs and improved multihoming efficiency and ingress
traffic engineering. Hosts do not have to change IP addresses and therefore, no
IP address numbering costs are involved with the LISP implementation.
LISP sites use IP
addresses in the EID namespace to address hosts and in Domain Name System (DNS)
in exactly the same way they are currently used. These addresses are not
advertised within the non-LISP RLOC namespace (that is, the Internet), but
instead are advertised by the LISP mapping services. The LISP site router
supports the LISP functionality of Ingress Tunnel Router (ITR) and Egress
Tunnel Router (ETR).
LISP is a pull model
analogous to DNS and is massively scalable. LISP is address family agnostic and
can be deployed incrementally.
LISP creates a Level of
indirection with two namespaces: EID and RLOC. The EID (Endpoint Identifier) is
the IP address of a host. The RLOC (Routing Locator) is the IP address of the
LISP router for the host. EID-to-RLOC mapping is the distributed architecture
that maps EIDs to RLOCs. The LISP Map Lookup is analogous to a DNS lookup. DNS
resolves IP addresses for URLs. LISP resolves locators for queried identifiers
or EID prefix.
LISP in Cisco IOS XR
Tunnel Router (PITR) and Proxy Egress Tunnel Router (PETR). PITR must be
configured using map resolver (no ALT support).
support for EID and RLOC space.
global configuration mode enables LISP
The LISP command
line interface, show commands output, and schema is to be changed in Cisco IOS
XR Release 4.3.1 to be similar to the LISP command line interface on Cisco IOS.