label switched path


(LSP) The specific path through a network that a datagram follows, based on its MPLS labels.

Last updated: 1999-06-14

label switching


A routing technique that uses information from existing IP routing protocols to identify IP datagrams with labels and forwards them to a modified switch or router, which then uses the labels to switch the datagrams through the network.

Label switching combines the best attributes of data link layer (layer two) switching (as in ATM and Frame Relay) with the best attributes of network layer (layer three) routing (as in IP).

Prior to the formation of the MPLS Working Group in 1997, a number of vendors had announced and/or implemented proprietary label switching.

Last updated: 2007-10-17

Label Switching Router


(LSR) A device that typically resides somewhere in the middle of a network and is capable of forwarding datagrams by label switching. In many cases, especially early versions of MPLS networks, a LSR will typically be a modified ATM switch that forwards datagrams based upon a label in the VPI/VCI field.

Last updated: 1999-06-14

Nearby terms:

Label Forwarding Information Baselabel switched pathlabel switching

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