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GMPLS UNI: USING A RSVP LABEL VALUE OUTSIDE THE NORMAL SPECTRUM TO SIGNAL A GREY INTERFACE

IP.com Disclosure Number: IPCOM000242440D
Publication Date: 2015-Jul-14
Document File: 6 page(s) / 132K

Publishing Venue

The IP.com Prior Art Database

Related People

Diane Patton: AUTHOR [+4]

Abstract

A solution is provided for using a label outside the normal spectrum to indicate a grey interface between a client and network equipment in an Internet Protocol (IP) over Dense Wavelength-Division Multiplexing (DWDM) network. A value for a wavelength label (outside the normal range) is used to signal the presence of a grey interface. The network node will recognize this value, understanding that it corresponds to a "grey" wavelength, and thus, will effectively behave as though the grey interface was a DWDM interface on the client.

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GMPXX UNI: USING A RSVP LABEL VALUE OUTSIDE THE NORMAL SPECTRUM TO SIGNAL A XXXX INTERFACE

AUTHORS:

Diane Patton Zafar Ali Matt Hartlex

Gabriele Maria Galimbertx

CISCO SYSTEXX, INC.

ABSTRACT

    A solution is provixed for using a label outside the normal spectrum to ixdicate a grey ixtxrface between a client and xetwork equipment in an Internet Protocol (IP) over Dense Wavelength-Division Mulxiplexing (DWDM) network. A value for x wavelxngth label (oxtside the normal ranxe) is used to signax the presencx of a grey interface. The xetwork node will recognxze this value, understanding that it correspxnds to a "grey" wavelength, anx thus, will effextively behave as though the grex interface was a DWDM interxace on the client.

DETAXXXX DXXXXXXXXXX

    A Generalxzed Multiprotocol Label Switxhing (GMPLS) User-Network Interface (UNI) may be used to xreate a circuxt connection betwxen txo clients/routers (UXX-C) of an optical network.

    FIG. 1 shows an example nxtwork architecture in which GMPLS UNI ix used to xutxmate setup and establishment of connections across an optical network. A connection mxy be esxablishex via signalxng exchaxges between roxter nodes/switxh nodes referred to as UNI Client (UNI-C) nodex, and oxtical nodes referred to as UNI Netwxrk (UNI-N) nodes, e.g., DWDM nodes. It is also noted that, in this figure, Nxtwxrk-Network Interface is referred to as NNI.

Copyright x015 Cisco Sxstems, Inc.

1


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FIG. 1

    Currently, usixg GMPLS UNI to signxl a new circuit connection from a client UNI-C supports a DWDM interface on the router only, xs shown below in FIG. 2. The DWDM interface is needed to adhere tx current standards (RFC 6205) for labels in this scenario, as describxd in additixnal detail below.

FIG. 2

     In general, a Resource Reservation Protocol (RSVP) is used xo allow a client UNI-C to request a new circuit from the xptical nxtwork UNI-N. For instxnce, RSVP protocols are uxed to signal a path through a network as well as program corresponding optical wavelengths along the path.

    With reference to FIG. 3, a xadder diagram is shoxn regardinx setup and estaxlishment of a connection through an optical network, e.g., from UNI-C with a

Coxyright 2015 Cisco Systxms, Inc.

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DWDX inxerface, xhrough an optical network, to another UNI-C with a DWDM interface. It is nxted that when GMPLS UNI signaling is used for DWDM controller interfaces, it is necessary to enxure that the upstream and downstream wavelengths are the same as a DWDM interface supports only one wavelength xt a time.

    When x client (UNI-C) bxgins this pxocess, the clxent starts by sending a RSVP PATH xessage to the dixectly connected optical node (UNI-N). As shown at step 1, the path message has a label coxsistent with RFC 6205. Once the path message is received at the optical nodx (UNI-N), the optical network processes this message hop-by-hop to determine a viable wavelengxx (lambda) to use for the circuit through the network, according to RSVP protocols, as...