The label type that can be switched is placed in the encoding attribute of the switching service. For example, in 802.1Q the label type is a VID (or vlan identifier), and of course, the terminology was changed in carrier ethernet so we have STAG and CTAG. Very lucky for us ;-) If we use the existing vlan URI we would have something like this: <nml:SwitchingService id="urn:ogf:network:example.net:2012:vidSwitchingService" encoding="http://schemas.ogf.org/nml/2013/03/ethernet#vlan" labelSwapping="true"> <nml:Relation type="http://schemas.ogf.org/nml/2013/03/base#hasInboundPort"> <nml:Port id="urn:ogf:network:example.net:2012:nodeA:port_X:1780:in"/> <nml:Port id="urn:ogf:network:example.net:2012:nodeA:port_Y:1781:in"/> </nml:Relation> <nml:Relation type="http://schemas.ogf.org/nml/2013/03/base#hasOutboundPort"> <nml:Port id="urn:ogf:network:example.net:2012:nodeA:port_X:1780:out"/> <nml:Port id="urn:ogf:network:example.net:2012:nodeA:port_Y:1781:out"/> </nml:Relation> </nml:SwitchingService> This indicates a switching service that can switch a packet on the 802.1Q VID. John On 2013-10-31, at 9:37 AM, Henrik Thostrup Jensen <htj@nordu.net> wrote:
Hi
On Wed, 30 Oct 2013, Jeroen van der Ham wrote:
This is the decision regarding encoding and labeltype that was made for NML:
https://forge.ogf.org/sf/sfmain/do/go/artf6577 :
NML has currently a one-to-one relation between the layer encoding (a URI to define the layer of sublayer of a specific Port of Link) and the label type (a URI to define the resource label of a technology).
Make sense. Thanks for clarifying the difference.
Right now we don't use the encoding in the NSI topology. Is this something we should consider? I am not entirely sure what the benefits are though.
There is not a one-to-one correlation, because encodings (such as Ethernet) still allow traffic without labels at all.
Shouldn't a switching service have an encoding AND a labelType? An ethernet encoding could have both regular and VLAN and carrier ethernet vlan (with q-in-q / s-tag+c-tag), and might only be capable of changing one of them. How would I know which label types can be swapped?
Best regards, Henrik
Henrik Thostrup Jensen <htj at nordu.net> Software Developer, NORDUnet
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