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Re: Lambda LSP Forwarding Adjacency Doubt
Sergio,
You are correct that the Link Resource Manager (LRM) or Managers get involved.
When the Routing Controller (RC) has determined the link, the Connection
Controller (CC) will query the associated LRM for a specific link connection
within the link.
Depending on the "SNPP link case" (refer to 7.3.3/G.8080) the local LRM (LRMA)
can select the link connection independent of far end LRM (LRMZ) (case 1), or
there is negotiation necessary between LRMA and LRMZ to select the link
connection (case 2).
Regards,
Maarten
Sergio Belotti wrote:
>
> Hello Marteen,
> I read your examples just now and I have only one question regarding the sentence
> referred to the fact that "The ODUk link is created as part of network planning
> and/or (distributed) network engineering" . I agreebut, Shouldn't be a negotiation
> phase between the Link Manager at both side before the CC could be able to perform
> the connection ?
> Thank you
>
> Sergio
>
> mvissers@lucent.com wrote:
>
> > Manoj,
> >
> > The transport plane is a multi layer network as described in G.805 and its
> > technology specific recommendations G.803, G.872 and I.326. Each layer network
> > operates independent from each other layer network. Each layer network uses the
> > transport service provided by its server layer networks, and represents this
> > transport service as (G.805) links within its own layer network.
> >
> > In your example with nodes A, B, C and D, nodes A and D could operate on the
> > ODUk layer network (i.e. having an ODUk fabric) and nodes B and C would operate
> > on the OCh layer network (i.e. having an OCh fabric). Nodes A and D may have
> > also OCh fabrics, but this is not necessary; OCh termination points would
> > already be sufficient.
> >
> > Let me give a 3 node example (4 nodes don't fit the page width in this email) in
> > which a STM-N signal is to be transported through A, B and C. At C the STM-N
> > signal leaves the network within an OTM-0.m signal.
> >
> > node A node B node C
> > |<----------->|<------------------------------>|<------------------------->|
> >
> > STM-N ----
> > |
> > ------
> > |ODUk|
> > |port|
> > ------
> > |
> > -------------- --------------------
> > | ODUk | | ODUk |
> > | Fabric | | Fabric |
> > -------------- --------------------
> > ||...|....||| |||...|....||...|...
> > ------ ------ ------
> > |OTUk| |OTUk| |OTUk|
> > |OCh | |OCh | |Och |
> > |port| |port| |port|
> > ------ ------ ------
> > | ||....|...| |
> > | ---------------------------- ------------- |
> > | | OCh | | OCh | |
> > | | Fabric | | Fabric | |
> > | ---------------------------- ------------- |
> > ||||||||||| ||||||||||| ||||||||| ||||||||| |
> > ----------- ----------- --------- --------- -------
> > | OTM-n | | OTM-n | | OTM-n | | OTM-n | |OTM-0|
> > | port | | port | | port | | port | |port |
> > ----------- ----------- --------- --------- -------
> > | | | | |
> > | | | | |
> > ------------------- ---------------------- ------
> >
> > The above network can be represented by means of its ODUk and OCh layer networks
> > as follows:
> >
> > node A node B node C
> > |<----------->|<------------------------------>|<------------------------->|
> >
> > STM-N ----
> > |
> > ------
> > |ODUk|
> > |port|
> > ------
> > |
> > -------------- --------------------
> > | ODUk | | ODUk |
> > | Fabric | | Fabric |
> > -------------- --------------------
> > |||| ||||||||| |||||||||| ||||||
> > | | | | | | | |
> > -- | | ---------------------------------------- | | ------
> > | | ODUk Link | | ODUk Link
> > ----- --------------------------------------------------------- -----------
> >
> > As you can see at the ODUk layer network, nodes A and C are neighbors. The
> > intermediate node B is totally invisible. ODUk signalling takes place therefore
> > between nodes A and C. The ODUk Connection Controllers (CC) (refer to G.8080) in
> > nodes A and C are connected with each other via the signalling communication
> > network.
> >
> > | | |
> > ------ ------ ------
> > |OTUk| |OTUk| |OTUk|
> > |OCh | |OCh | |Och |
> > |port| |port| |port|
> > ------ ------ ------
> > | ||....|...| |
> > | ---------------------------- ------------- |
> > | | OCh | | OCh | |
> > | | Fabric | | Fabric | |
> > | ---------------------------- ------------- |
> > ||| ||||||| ||||||||| ||||||||| ||||||||| ||||||
> > | | | | | | | | | | | |
> > -- | | --------- | | -------------- | | ---
> > | | OCh Link | | OCh Link | |
> > ----- ----------------------- ------------------------------ --------
> >
> > As you can see at the OCh layer network, nodes A and B and nodes B and C are
> > neighbors. OCh signalling takes place therefore between nodes A, B and C. The
> > OCh CCs in nodes A, B and C are connected with each other for this purpose via
> > the signalling communication network.
> >
> > In the above 3-node example network, you will be able to setup ODUk connections
> > when the ODUk link is setup first. The ODUk link is created as part of network
> > planning and/or (distributed) network engineering. The ODUk link will exist when
> > one or more OCh trails are setup in the OCh layer network.
> >
> > So when you want to setup an ODUk [i.e. a TDM LSP] connection you can ignore the
> > Lambda level.
> >
> > Same principles apply of course to the SDH/SONET layer networks... i.e. you will
> > have a LOVC/VT layer with LOVC/VT links and a HOVC/STS layer with HOVC/STS
> > links.
> >
> > This multi-layer principle doesn't require to stack labels.
> >
> > Regards,
> >
> > Maarten
> >
> > manoj juneja wrote:
> > >
> > > Hi All,
> > > If there are 4 nodes say A, B, C and D. There is a Lambda FA
> > > established from A to D and if a new TDM LSP request comes to node A
> > > which is to be tunneled through the already established lambda FA-LSP
> > > then the node A sends the Path/label request message directly to node
> > > D. What label the node D will send back to node A in the RESV/label
> > > mapping message since the FA-LSP is just one label (lambda) ? Does it
> > > mean that all the LSPs which are tunneled through the lambda FA-LSP
> > > will be allocated the same label by node D to node A ?
> > >
> > > Please help.
> > >
> > > Regards,
> > > manoj.
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp
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