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Features of MPLS
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Table 4-1 Comparison of Protocols
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Transport Security Multipoint-to-point Multicast support LSP merging LSP state LSP refresh High availability Rerouting Explicit routing Route pinning
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CR-LDP Support TCP Yesa Yes Nob Yesc Hard Not needed No Yes Strict and loose Yes RSVP Support Raw IP Yesa Yes Nob Yesc Soft Periodic, hop by hop Yes Yes Strict and loose Yes, by recording path Yes, priority based Yes Yes Yes Reverse path Explicit Yes No
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LSP preemption LSP protection
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Shared reservations
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Traffic parm exchange Traffic control Policy control
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Layer 3 protocol indicated Resource class constraint
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a CR-LDP inherits any security applied to TCP RSVP cannot use IPSec but has its own authentication See the section Security b c
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Multicast support is currently not defined for any of the existing label distribution protocols See the section Multipoint Support
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d CR-LDP does not allow explicit sharing, but see the section LSP Modification for details on changing the allocated resources
Many operating systems are packaged with full IP stacks including UDP and TCP, but sometimes TCP is not available On some platforms, access to raw IP is restricted Some existing ATM switches might not already incorporate an IP stack at all so one must be added to support either CR-LDP or RSVP The availability and accessibility of the transport protocols may
AM FL Y
Yes Nod Yes Implicit No Yes
Yes, priority based
Forward path
4
dictate which label distribution protocol is used, but it is unlikely to be a major factor in the choice made by most MPLS equipment suppliers RSVP requires that all received IP packets carrying RSVP messages are delivered to the RSVP protocol code without reference to the actual destination IP address in the packet This feature may require a minor modification to the IP implementation See the sections Security, Scalability, High Availability, and Link and Peer Failure Detection for details on how the choice of transport protocol affects other functions provided in an MPLS system Security TCP is vulnerable to denial of service attacks, where the performance of the TCP session can be seriously impacted by unauthorized access to the network This could impact CR-LDP Authentication and policy control are specified for RSVP This enables the originator of the messages to be verified (for example, using MD5) and makes it possible to police unauthorized or malicious reservation of resources Similar features could be defined for CR-LDP, but the connection-oriented nature of the TCP session makes this less of a requirement TCP could make use of MD5 IPSec is a series of drafts from the IETF to provide authentication and encryption security for packets transported over IP If IPSec support is available in the IP stack, it can be used by CR-LDP simply as part of the normal TCP/IP processing RSVP targets its Path messages at the egress LSR, not at the intermediate LSRs This means that IPSec cannot be used because the intermediate LSRs would find themselves unable to access the information in the Path messages Multipoint Support Multipoint-to-point LSPs enable LSPs to merge at intermediate LSRs, reducing the number of labels required in the system and sharing downstream resources This approach works particularly well in packet-switched networks, but requires nonstandard hardware in cellswitched networks such as ATM to prevent the interleaving of cells CRLDP and RSVP support multipoint-to-point LSPs Point-to-multipoint (multicast) IP traffic is not addressed by the current version of the MPLS architecture so it is not supported by CR-LDP or Labels RSVP Generic RSVP was originally designed to include resource reservation for IP multicast trees so it may be easier to extend to support multicast traffic in the future However, this is an area for further study in both protocols Scalability Thescalability of a protocol should be considered in terms of the network flows it uses, the resources needed to maintain the protocol state at each node, and the CPU load on each node All of this must be considered in the context of the way in which MPLS will be used in the network If trunk LSPs will be used across the network to connect key edge
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