I don't think there is a way. The MSILs are between us and the gateways.
We may not always even be on the same MSIL, unlike with Entanet, at least in the early days. From the data James at ADSL24 published it seemed at that time that MSANs were fixed-routed to a corresponding MSIL, but that was before resilient fail-over of MSILs was (I hope!) implemented by BT Wholesale.
Entanet however uses WBC, where all 20 nodes have Enta MSILs. Plusnet are using WBMC where BT Wholesale route from the MSAN to the Plusnet MSILs, so I don't know how fixed or variable that routing is.
It appears to me that "Portal" is what Plusnet are called an MSIL. What happens if one dies I don't know. Whether we get a major blackout for customers, or whether they can be auto-rerouted by BTW to a different one, or whether a disconnection/reconnection by the user triggers a reroute.
The graphs look to be auto-scaling to the usage, with no mention of the capacity rented on that MSIL.
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