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One solution to improving network scaling is to use LSP hierarchy, based on adding labels to the MPLS label stack For example, one popular approach is to run LDP over RSVP-TE In this approach, LDP LSPs are used end to end, but RSVP-TE LSPs are used to cross the backbone area This enables service providers to use the rapid restoration mechanisms of RSVP-TE and to traffic engineer within the backbone (typically from city to city), but to scale the network to a similar size to that achievable with a pure LDP design In order for this approach to operate, the Area Border Routers (ABRs) must be configured with targeted LDP sessions to each other, so that the ABRs for each area can advertise labels to the ABRs for all other areas for each edge router (Label Edge Router or LER) in the area For a network of N LERs and M areas with two ABRs per area, this results in N + 2M(M 1) LSPs for a network where each LER has a single LSP to every other LER This LDP over RSVP-TE approach may be extended to use an RSVP-TE LSP from the LER to the ABR, from ABR to ABR, and from ABR to LER To do this, targeted LDP sessions are configured between the ABRs in each area and all their local LERs, and a full mesh of RSVP-TE LSPs is created between all the ABRs and LERs in each area Further hierarchical scaling approaches are possible, for example using RSVP-TE to create forwarding adjacencies over which other RSVP-TE LSPs may be signalled
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There are two fundamental aspects to Quality of Service (QoS) in packet-switched networks:
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Ensuring the network can meet the QoS requirements before the packet is sent Enforcing QoS in the network elements as packets are forwarded
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The former requirement is addressed in the control plane, and the latter in the forwarding plane The forwarding plane mechanisms used for QoS enforcement are generally based on using multiple queues that are scheduled in strict order of priority, using some form of round robin mechanism or a combination of both Packets that are classified into the same queue will maintain order throughout the network, but order will not be maintained across queues Packets may also be marked with an indicator of their drop precedence to enable the network elements to decide which packets to drop first during congestion, using algorithms such as Weighted Random Early Detection (WRED) QoS models themselves may be divided into two major classes:
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Soft QoS (Class of Service or CoS) In this model (epitomised by the IETF DiffServ architecture), forwarding plane QoS techniques are used to provide different forwarding treatment to different classes of traffic This model scales well, since there is no need for per-flow state, and is applicable to connectionless and connectionorientated forwarding, but is unable to provide guaranteed forwarding behavior Hard QoS In this model (epitomised by the IETF IntServ architecture) resources are reserved for the each connection using the control plane, and then forwarding plane techniques are applied to ensure that each connection gets the required level of QoS This model is less scalable (as per-flow reservations are required), but can be used to enable a firm guarantee that a traffic contract will be met
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When signalling an MPLS LSP with RSVP-TE, an LSR signals the bandwidth required for the LSP Each LSR in the path checks the bandwidth requested against the bandwidth available on its outbound link and only forwards the Path message if there is sufficient bandwidth available for the LSP on that link The available bandwidth on each link is also advertised using the TE-enhanced IGP (ie, OSPF-TE or ISIS-TE) and will be stored in the TED at each LSR When an LSR runs CSPF, it will only select a path that has sufficient bandwidth to allow the LSP to be established However, LSP reservations and IGP advertisements run asynchronously to each other, and the LSP setup may still fail due to insufficient bandwidth at one of the LSRs in the path as described above In that case, the ingress LSR will run CSPF again to find another path The process of checking whether resources are available before attempting to reserve them is known as Connection Admission Control (CAC) and required to provide hard QoS LDP does not reserve bandwidth for LSPs, and control plane QoS is not applicable for LDP-signalled LSPs As mentioned previously, there are two QoS models for MPLS
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