Question: During an SGW Partial Failure, what action does the SGW take after detecting a partial fault with one or more corresponding CSIDs (Component IDs) present?
Option 1: The SGW immediately releases all PDN connections without notifying MME or PGW peers.
Option 2: The SGW performs implementation-specific cleanup operations but does not notify MME or PGW peers.
Option 3: The SGW sends a GTPv2 Delete PDN Connection Set Request to MME and PGW peers supporting the feature, containing all SGW CSIDs of the failing component(s).
Option 4: The SGW waits for explicit instructions from MME or PGW before taking any recovery actions.
Explanation: When an SGW undergoes a partial failure and has one or more corresponding CSIDs, it initiates a controlled recovery process. This involves notifying its peers (MME for S11 interface and PGW for S5/S8 interfaces) about the failure by sending a GTPv2 Delete PDN Connection Set Request. This notification ensures that affected PDN connections are properly deleted from the network, maintaining integrity and preventing orphaned sessions.