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MPLS can exist in both an IPv4 and an IPv6 environment, using appropriate routing protocols. The major goal of MPLS development was the increase of routing speed. [ 37 ] This goal is no longer relevant [ 38 ] because of the usage of newer switching methods such as ASIC , TCAM and CAM -based switching able to forward plain IPv4 as fast as MPLS ...
The Label Distribution Protocol (LDP) is a protocol defined by the IETF (RFC 5036) for the purpose of distributing labels in an MPLS environment. LDP relies on the underlying routing information provided by an IGP in order to forward label packets.
Generalized Multi-Protocol Label Switching (GMPLS) [1] is a protocol suite extending MPLS to manage further classes of interfaces and switching technologies other than packet interfaces and switching, such as time-division multiplexing, layer-2 switching, wavelength switching and fiber-switching.
As of February 2003, the Internet Engineering Task Force (IETF) MPLS working group deprecated Constraint-based Routing Label Distribution Protocol (CR-LDP) and decided to focus purely on RSVP-TE. [2] Operational overhead of RSVP-TE compared to the more widely deployed Label Distribution Protocol (LDP) will generally be higher.
VRFs were initially introduced in combination with Multiprotocol Label Switching (MPLS), but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite: usage of VRFs without MPLS. Example of a global and VRF Routing table summary with different routes/routing protocol
GMPLS consist of several protocols, including routing protocols (OSPF-TE or ISIS-TE), link management protocols (LMP [1]), and a reservation/label distribution protocol . The reservation/label distribution protocol CR-LDP has now been deprecated by the IETF in RFC 3468 [ 2 ] (February 2003) and IETF GMPLS working group decided to focus purely ...
This is a list of the IP protocol numbers found in the field Protocol of the IPv4 header and the Next Header field of the IPv6 header. It is an identifier for the encapsulated protocol and determines the layout of the data that immediately follows the header. Both fields are eight bits wide.
Constraint-based routing (CR) is a mechanism used to meet traffic engineering requirements. These requirements are met by extending LDP for support of constraint-based routed label-switched paths (CR-LSPs). Other uses for CR-LSPs include MPLS-based virtual private networks. CR-LDP is almost same as basic LDP, in packet structure, but it ...