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:
“The formation of an oppositional world view is necessary for feminist struggle. This means that the world we have most intimately known, the world in which we feel “safe” ... must be radically changed. Perhaps it is the knowledge that everyone must change, not just those we label enemies or oppressors, that has so far served to check our revolutionary impulses.”
—Bell (c. 1955)
“In a coign of the cliff between lowland and highland,
At the sea-down’s edge between windward and lee,
Walled round with rocks as an inland island,
The ghost of a garden fronts the sea.”
—A.C. (Algernon Charles)