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ISIS TE Metric Extensions draft-previdi-isis-te-metric-extensions -02

ISIS TE Metric Extensions draft-previdi-isis-te-metric-extensions -02 Stefano Previdi < sprevidi@cisco.com > Spencer Giacalone < Spencer.giacalone@thomsonreuters.com > Dave Ward < wardd@cisco.com > John Drake < jdrake@juniper.net > Alia Atlas < akatlas@juniper.net >

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ISIS TE Metric Extensions draft-previdi-isis-te-metric-extensions -02

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  1. ISIS TE Metric Extensions draft-previdi-isis-te-metric-extensions-02 Stefano Previdi <sprevidi@cisco.com> Spencer Giacalone <Spencer.giacalone@thomsonreuters.com> Dave Ward <wardd@cisco.com> John Drake <jdrake@juniper.net > Alia Atlas <akatlas@juniper.net> Clarence Filsfils <cfilsfil@cisco.com> IETF-85 Atlanta, November 2012

  2. draft-previdi-isis-te-metric-extensions-02 • This draft proposes the same extensions proposed in draft-ietf-ospf-te-metric-extensions • ISIS to carry topology performance information • Currently, the only “cost” is the one statically assigned to a link • Difficult to capture latency, loss and bandwidth in single static metric • I need to know the current values at path/topology compute time

  3. Overview • ISIS TE Metric Extensions automatically distribute performance data • Allows control plane manipulation • E.g.: To permit MPLS tunnel setup failover, fallback based on network performance • E.g.: Compute ALTO topologies based on current network resources • Intentionally independent from measurement protocols • Also, intentionally independent from applications • MPLS-TE • Routing • ALTO-Like ranking services • Multi-Layer topology advertisement • Weighted ECMP • … • Modular and extensible

  4. New SubTLVs • Two Main Types of information • Nominal (Routine) • Anomalous (Significant) information • Nominal TLVs used to calculate steady state • Five New Sub-TLVs (Currently): • Unidirectional Link Delay • Unidirectional Delay Variation • Unidirectional Packet Loss • Unidirectional Residual Bandwidth • Unidirectional Available Bandwidth • Upon SLA violation, Anomalous (“A”) bit raised.

  5. New SubTLVs • Changes in -02 • “A” bit defined for all SubTLVs • Mandate use of Interface and Neighbor Addresses SubTLVs for both IPv4 and/or IPv6

  6. Thank You

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