Profile 27 w/ Constraints
Coming from the previous lab, color the XR1-XR3 link RED. Configure the static SR Tree-SID policy to exclude RED links.
Answer
Explanation
Tree-SID allows us to use standard SR-TE tools to engineer the path an mVPN distribution tree takes. This is a big benefit over mLDP, as mLDP doesn’t give us this control.
To accomplish this lab we simply set the RED affinity on the XR1-XR3 link on both of those nodes.
The PCE must define the bit-mapping under the PCE config, and then include this as a constraint on the static Tree-SID policy.
We can see that the calculated policy now avoids XR3:
XR3 no longer has any Tree-SID state:
The multicast distribution tree is now taking this path:
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