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Routing Extensions to Support Network Elements with Switching Constraint

This draft provides a routing scheme for Lambda LSPs in networks with TE-Link Selectivity constraint. It discusses the constraint in TE-Link Selectivity and proposes extensions for GMPLS routers to handle this constraint. This draft also explores the problem statements and provides examples of ROADMs with TE-Link Selectivity.

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Routing Extensions to Support Network Elements with Switching Constraint

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  1. Routing Extensions to Support Network Elements with Switching Constraint draft-imajuku-ccamp-rtg-switching-constraint-01.txt Wataru Imajuku: imajuku.wataru@lab.ntt.co.jp Yoshiaki Sone: sone.yoshiaki@lab.ntt.co.jp Itaru Nishioka: i-nishioka@cb.jp.nec.com 67th IETF San Diego November 2006

  2. Objective of This Draftand Related Studies • Objective of This Draft • Provides routing scheme of Lambda LSPs in the networks specifically having constraint in TE-Link Selectivity • Related Documents • RFC4054 • Discusses Signaling Impairment in transparent optical networks • draft-ashwood-ccamp-gmpls-constraint-reqts-0x.txt (Expired) • Proposes to advertise abstract link information of the network having optical constraint • draft-shiba-ccamp-gmpls-lambda-labels-01.txt • Proposed bit-map advertisement of status of wavelength label • draft-rabbat-ccamp-gmpls-lambda-labels-00.txt • Signaling extensions to directly assign Wavelength of Lambda LSPs in non or limited wavelength convertible networks • Handles constraint in Label Selectivity 67th IETF San Diego November 2006

  3. New Problem Statementsin This Draft • Constraint in TE Link Selectivity • Sharp market rise of reconfigurable optical add/drop multiplexers (ROADMs) • ROADM has constraint in TE-Link Selectivity • ROADM has two groups of tributary ports, connectable only for East or West NNI • GMPLS routers or other GMPLS capable nodes should • take into account the constraint of TE Link Selectivity. 67th IETF San Diego November 2006

  4. TE Link Selectivity in ROADMs ROADM NNI Link (West) NNI Link (East) Drop Switches Add Switches East Bound Bi-Directional LSP West Bound Bi-Directional LSP Add Switches Drop Switches Rx Tx Rx Tx Rx Tx Rx Tx West Bound Tributary Port Group East Bound Tributary Port Group 67th IETF San Diego November 2006

  5. Example of ROADM Ring • LSPs in ROADM Rings • LSPs from West Tributary Ports are terminated at East Tributary Ports • This is also true for the case of vice versa. • Label Allocation • Approach 1 Routing Solve Label Allocation (Bit-map advertisement) (draft-shiba-ccamp-gmpls-lambda-labels-01.txt) • Approach 2 Signaling Solve Label Allocation (Label Set + Null Upstream) IP Router #B IP Router #B TE-Link of Tributary-E TE-Link of Tributary-W NNI-W NNI-E NNI-W NNI-E TE-Link of Tributary-W TE-Link of Tributary-E IP Router #A IP Router #A 67th IETF San Diego November 2006

  6. Necessity of Extension • In addition to bit-map information of wavelength status, information of TE-Link Selectivity is necessary • Indispensable in multi-ring, ROADM/OXC hybrid networks OXC ROADM #X Tributary-E Tributary-W Tributary-W Ingress Egress 67th IETF San Diego November 2006

  7. Possible GMPLS Routing Extensions • Advertise • Selectable and/or Un-selectable TE-Link lists from advertised TE-Link • Sub-TLV Type TBD • Length: variable • Name: Selectable/Un-Selectable Link Local Identifier 67th IETF San Diego November 2006

  8. Next Action • Receiving feed back from several persons, now authors feel necessity of an analysis draft with the different view of RFC4054. • Model network architecture having constraint in wavelength selectivity and/or TE-Link selectivity • Analyze signaling procedure to establish LSPs in such networks • Analyze the minimum set of routing and signaling extensions • Thanks Akira Nagata and Akira Chugo (Fujitsu) for giving us valuable feed back. 67th IETF San Diego November 2006

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