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Spirent KB Article
Doc ID: FAQ19283
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Spirent TestCenter: How can I create non MPLS traffic when ISIS Segment Routing is enabled?
When you enable ISIS-SR on a Spirent TestCenter emulated device, it enables it to be MPLS capable and adds a header into its interface.
Subsequently, if you add a bound stream block, it becomes an MPLS stream since it is sourcing from an ISIS-SR (MPLS capable) device; hence, traffic will always be MPLS encapsulated, and it expects an MPLS label to resolve.
If you don’t want the traffic to be MPLS encapsulated, you can do either:
Bound the traffic between endpoints that are not running ISIS-SR.
Create an IPv4 device running ISIS, without SR, on the port where you have the ISIS-SR devices, and use it for bound stream blocks.
Use raw stream blocks.
Product : Spirent TestCenter,ISIS