An "ingress router" is a
Label Switch Router that is a starting point (source) for a given
Label Switched Path (LSP). An ingress router may be an
egress router or an intermediate router for any other LSP(s). Hence the role of ingress and egress routers is LSP specific. Usually, the
MPLS label is attached with an IP packet at the ingress router and removed at the egress router, whereas label swapping is performed on the intermediate routers. However, in special cases (such as
LSP Hierarchy
LSP may refer to:
Governance and politics
* Left Socialist Party (Belgium), the Belgian section of the "Committee for a Workers' International"
* Liberal State Party, a former Dutch political party
* Local strategic partnership, a government-in ...
in RFC 4206,
LSP Stitching
LSP may refer to:
Governance and politics
* Left Socialist Party (Belgium), the Belgian section of the "Committee for a Workers' International"
* Liberal State Party, a former Dutch political party
* Local strategic partnership, a government-in ...
and
MPLS local protection) the ingress router could be pushing label in
label stack
A label (as distinct from signage) is a piece of paper, plastic film, cloth, metal, or other material affixed to a container or product, on which is written or printed information or symbols about the product or item. Information printed dir ...
of an already existing MPLS packet (instead of an IP packet). Note that, although the ingress router is the starting point of an LSP, it may or may not be the source of the under-lying IP packets.
MPLS networking
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