Limitations
The following are the known limitations of the feature:
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If Sxa leg is of one user-plane-service and N4 leg is of another user-plane-service, then datapath won't be collapsed.
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If Sxa leg is under one context and N4 leg is in another context, then datapath can't be collapsed.
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The S-GW part of the show subscribers user-plane-only full all CLI output doesn't display ToS-marked Uplink and Downlink packets.
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For the S-GW part of the show user-plane-service statistics rat all CLI output, the session statistics for Unknown is incremented, however, the data statistics aren't incremented under RAT-type Unknown.
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Lawful Intercept for S-GW isn't supported.
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S-GW charging isn't supported.
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S-GW bearer inactivity timeout isn't honored, as it's determined by S-GW URR for which processing isn't done for collapsed datapath.
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If S-GW leg of call is locally purged for converged session, then the UPF continues to send data toward eNodeB.