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Re: Lambda LSP Forwarding Adjacency Doubt
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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