The MPLS label stack contains one or more label stack entries. It then forwards the packet to the next-hop associated with the FEC. When an ingress LSR receives a packet, it assigns the packet to Forwarding Equivalence Class (FEC) and encapsulates the packet with an MPLS label stack. An LSP can traverse the least-cost path or it can traverse a traffic-engineered path. A single LSR can serve as ingress for some packets and egress for others.Ī Label Switched Path (LSP) provides connectivity between an ingress LSR and an egress LSR. Packets enter the MPLS domain through an ingress LSR and exit the MPLS domain through an egress LSR. An MPLS domain is a contiguous set of Label Switching Routers (LSRs). Finally, the article compares SR with legacy MPLS systems, and identifies its unique merits. This article provides some historical context by describing the MPLS forwarding plane and control plane protocols, explains how Segment Routing works, introduces the MPLS-SR forwarding plane, and shows how the SR control plane is used. Two forwarding plane encapsulations are being defined for SR: Multiprotocol Label Switching (MPLS) and IPv6 with a Segment Routing Extension Header. I quickly verified the segment end/start matches and then double checked against the web search.Segment Routing (SR) is a new traffic-engineering technology being developed by the IETF’s SPRING Working Group. After walking through 12 chunks, I hit a point where there was only 1 segment list left. During the course of the chunk identification, I came across 3 where I had no choice, the only next chunk was the same one. It took me about 35mins to get through step 5, much shorter than watching the whole movie. A web search can also help verify which one is the right one, as I did for Mockingjay Part 1.
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