A label edge router (LER, also known as edge LSR) is a router that operates at the edge of an Multiprotocol Label Switching network.
When forwarding IP datagrams into the MPLS domain, it uses routing information to determine appropriate labels to be affixed, labels the packet accordingly, and then forwards the labelled packets into the MPLS domain.
Likewise, upon receiving a labelled packet which is destined to exit the MPLS domain, the LER strips off the label and forwards the resulting IP packet using normal IP forwarding rules.
Famous quotes containing the words label and/or edge:
“There is no such “condition” as “schizophrenia” but the label is a social fact and the social fact a political event.”
—R.D. (Ronald David)
“The real risks for any artist are taken ... in pushing the work to the limits of what is possible, in the attempt to increase the sum of what it is possible to think. Books become good when they go to this edge and risk falling over it—when they endanger the artist by reason of what he has, or has not, artistically dared.”
—Salman Rushdie (b. 1947)