Brief Introduction to Juniper and its TE features Huang Jie [CSD-Team19]

Some Acronyms PIC Physical Interface Card FEB Forwarding Engine Board ESD Electrostatic Discharge TE Traffic Engineering LSP Label Switched Path MPLS MultiProtocol Label Switching RSVP Resource reSerVation Protocol GMPLS Generalized Multiprotocol Label Switching

General Impression  Same scalable and production-hardened JUNOS software runs on all M-series platforms, a consistent set of capabilities is available at all network locations regardless of customer connection or serving area density.  After physical connection, we will do configurations using JUNOS.

Traffic Engineering Overview 1.The task of mapping traffic flows onto an existing physical topology is called traffic engineering (TE) 2. In the JUNOS software, traffic engineering is implemented with Multiprotocol Label Switching (MPLS) and the Resource Reservation Protocol (RSVP). Traffic engineering is composed of four functional components: Packet Forwarding Component Information Distribution Component Path Selection Component Signaling Component

MPLS Overview MPLS: Multiprotocol Label Switching  It provides a mechanism for engineering network traffic patterns that is independent of routing tables. MPLS assigns short labels to network packets that describe how to forward them through the network.  In the traditional Level 3 forwarding paradigm, an independent forwarding decision is made for each packet at each hop.  In an MPLS environment, the analysis of the packet header is performed just once, when a packet enters the MPLS cloud. The packet is then assigned to a stream, which is identified by a label, which is used as lookup index into the label forwarding table. For each label, this table stores forwarding information.

MPLS Labels

TE and MPLS The core of the traffic engineering design: label-switched paths (LSPs) An LSP is connection-oriented, like a virtual circuit in Frame Relay or ATM LSP with BGP & IGP Routers in LSPs Ingress router Egress router Transit router

LSP Types Static LSPs manually assign labels on all routers LDP-signaled LSPs Label Distribution Protocol (LDP) is a protocol for distributing labels in nontraffic-engineered applications RSVP-signaled LSPs : There are two kinds of RSVP-signaled LSPs  Explicit-path LSPs  Constrained-path LSPs

RSVP Overview A host uses RSVP to request a specific Quality of Service (QoS) from the network, on behalf of an application data stream. RSVP carries the request through the network, visiting each node the network uses to carry the stream. At each node, RSVP attempts to make a resource reservation for the stream. The RSVP Daemon is composed of four components: Policy Control Admission Control Packet Classify Engineering Packet Forward Engineering

GMPLS Overview 1 Generalized Multiprotocol Label Switching (GMPLS) is the next-generation implementation of Multiprotocol Label Switching (MPLS). GMPLS have four kinds of LSPs: Fiber-switched capable (FSC) Lambda-switched capable (LSC) Time-division multiplexing (TDM) switched-capable (TSC) Packet-switched capable (PSC)

GMPLS Overview 2 GMPLS two service models: Peer to Peer Model Overlay Model GMPLS establish LSPs in three mechanisms: An out-of-band control channel and a data channel RSVP-TE extensions for GMPLS Bidirectional LSPs GMPLS signaling requires strict paths. Also, you must disable CSPF with the no-cspf statement