Multiprotocol Label Switching (MPLS) traffic engineering software enables an MPLS traffic engineering provides an integrated approach to traffic engineering. Traffic Engineering with MPLS provides you with information on how to use .. consulting group, focusing on IP/MPLS routing, VPN, Traffic Engineering, and. Resource Reservation Protocol-Traffic Engineering (RSVP-TE). Page Segment Routing. Page MPLS-TE Tunnel Protection – End-to-End Protection .

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The MPLS Traffic Engineering (TE) Technology module discusses the requirement for traffic engineering in modern networks that must attain optimal resource. taking advantage of MPLS, traffic engineering can route the packets through change and traffic switching to other LSPs in case of changes [MPLSPDF]. Traffic Engineering before MPLS. ▫ Basics of TE tunnels. ▫ Information distribution. ▫ Path calculation and setup. ▫ Forwarding traffic down tunnels.

This value MUST be set to transit 2 at transit points along the tunnel, if transit points are supported. This value MUST be set to tail 3 at the terminating point of the tunnel if tunnel tails are supported.

The value headTail 4 is provided for tunnels that begin and end on the same LSR. This table identifies the segments that compose this tunnel, their characteristics, and relationships to each other. The following describes these bit fields: fastRerouteThis flag indicates that the any tunnel hop may choose to reroute this tunnel without tearing it down.

This flag permits transit routers to use a local repair mechanism which may result in violation of the explicit routing of this tunnel. When a fault is detected on an adjacent downstream link or node, a transit router can re-route traffic for fast service restoration.

This value may optionally point at an externally defined traffic parameter specification table. A value of zeroDotZero indicates best-effort treatment. By having the same value of this object, two or more LSPs can indicate resource sharing.

A group of tunnel instances is defined as a set of LSPs with the same mplsTunnelIndex in this table, but with a different mplsTunnelInstance. Tunnel instance priorities are used to denote the priority at which a particular tunnel instance will supercede another. Instances of tunnels containing the same mplsTunnelInstancePriority will be used for load sharing.

This object is meaningful only at the head-end of the tunnel.

This value reflects the secondary index into mplsTunnelHopTable. A value of zero denotes that no path is currently in use or available. This is automatically updated by the agent when the actual hops becomes available. This is automatically updated by the agent when computed hops become available or when computed hops get modified. If this value is unavailable, it MUST return a value of 0.

The primary instance of this tunnel is defined in mplsTunnelPrimaryInstance. That is, when the value of mplsTunnelOperStatus was first set to up 1. When a row in this table is in active 1 state, no objects in that row can be modified by the agent except mplsTunnelAdminStatus, mplsTunnelRowStatus and mplsTunnelStorageType. Conceptual rows having the value 'permanent' need not allow write-access to any columnar objects in the row.

Traffic Engineering with MPLS

If the number of unassigned entries is exhausted, a retrieval Srinivasan, et al. This object may also return a value of 0 when the LSR is unable to accept conceptual row creation, for example, if the mplsTunnelHopTable is implemented as read-only. To obtain the value of mplsTunnelHopListIndex for a new entry in the mplsTunnelHopTable, the manager issues a management protocol retrieval operation to obtain the current value of mplsTunnelHopIndex.

When the SET is performed to create a row in the mplsTunnelHopTable, the Command Responder agent must determine whether the value is indeed still unused; Two Network Management Applications may attempt to create a row configuration entry simultaneously and use the same value.

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If it is currently unused, the SET succeeds and the Command Responder agent changes the value of this object, according to an implementation-specific algorithm. If the value is in use, however, the SET fails. The Network Management Application must then re-read this variable to obtain a new usable value.

Each row in this table is indexed by mplsTunnelHopListIndex which corresponds to a group of hop lists or path options. Each row also has a secondary index mplsTunnelHopIndex, which indicates a group of hops also known as a path option.

Finally, the third index, mplsTunnelHopIndex indicates the specific hop information for a path option. In case we want to specify a particular interface on the originating LSR of an outgoing tunnel by which we want packets to exit the LSR, we specify this as the first hop for this tunnel in mplsTunnelHopTable. This is otherwise known as a path option. The value of this object cannot be changed if the value of the corresponding mplsTunnelHopRowStatus object is 'active'. The type of this address is determined by the value of the corresponding mplsTunnelHopAddrType.

Otherwise this value is irrelevant and should be ignored. Otherwise the agent should set this object to zero- length string and the manager should ignore this. Otherwise the agent should set this object to zero-length string and the manager should ignore this. The present tunnel being configured is tunneled through this hop using label stacking.

This object is otherwise insignificant and should Srinivasan, et al. The value of this object has no meaning if the mplsTunnelHopInclude object is set to 'false'. If this value is set to 'false', then this hop must be avoided when calculating the path for this tunnel.

The default value of this object is 'true', so that by default all indicated hops are included in the CSPF path computation. If this object is set to 'false' the value of mplsTunnelHopType should be ignored.

If this value is set to explicit, the user should specify the entire path for the tunnel to take.

This path may contain strict or loose hops. When a row in this table is in active 1 state, no objects in that row can be modified by the agent except mplsTunnelHopRowStatus and mplsTunnelHopStorageType.

If the number of unassigned entries is exhausted, a retrieval operation will return a value of 0. This object may also return a value of 0 when the LSR is unable to accept conceptual row creation, for example, if the mplsTunnelTable is implemented as read-only.

Forwarding Traffic Down Tunnels.

BRKMPLpdf - Deploying Traffic Engineering in MPLS and

Forwarding Traffic Down Tunnels with Autoroute. Load Sharing. Forwarding Adjacency. Automatic Bandwidth Adjustment. The DiffServ Architecture. DiffServ and IP Packets. Label Stack Treatment.

Tunnel Modes. Protection and Restoration. The Need for Fast Reroute. What Is Protection? Types of Protection. Link Protection.

Node Protection. Advanced Protection Issues. Sample Network for Case Studies.

Different Types of TE Design. Google Scholar Goldberg and R. Tarjan, A new Approach to the maximum flow problem. Lewis and L. Rosen, A. Viswanathan, and R.

Awudche, J. Malcolm, J. Agogbua, M.

DORA: Efficient Routing for MPLS Traffic Engineering

O'Dell, and J. Xiao, A. Hanna, B. Bailey, and L. Ahuja, T. Magnanti, and J. Ahn and W. Aukia, M.Hu, R. The traffic in the core of MSN network consists of only the traf- Prevalence of latency inflation To quantify how widespread la- fic generated by inter-DC communications. Agogbua, M. There are a number of cases in which it is improve this paper. Email: tnadeau cisco.

Similarly subscription factor networks. Join Sign In. The implementations which do not implement this variable must return unspecified 1 for this value and must not allow a user to set this value. Email: arunv force10networks.

How SPF Works.