Cisco Cisco ASR 5700 Guía Para Resolver Problemas

2. NSVC BLOCK/DE-BLOCK (RESET)

SNS-DELETE: The SNS-DELETE PDU is used to delete previously configured IP Endpoints.

SNS-ACK: The SNS-ACK PDU is used to acknowledge the SNS-ADD PDU or the SNS-DELETE
PDU.

SNS-ADD: The SNS-ADD PDU is used to add additional IP Endpoints.

Problem

Failure Scenario 1. NSVC does not come up after Packet Control Unit (PCU) reboot

In this scenario, the PCU sends SNS-ADD PDU before it sends any SNS-DELETE PDU SGSN
after PCU reboot ,and hence the NSVC does not come up.

Failure Scenario 2. NSVC BLOCK command does not send SNS-DELETE PDU, hence NSVC
cannot be reset.

For active NSVC, not carrying traffic (hung state), the SNS-DELETE PDU was not sent, while
Blocking/De-Blocking the NSVC to perform reset.

Blocking NSVC