Alcatel Lucent 7750 SR Router High Availability Deployment and Troubleshooting

Check the redundancy status (show redundancy), if "out-of-sync" is displayed, perform manual synchronization (admin redundancy synchronization).

Check the system logs to confirm if there are any hardware failures (such as SF/CPM fans, memory errors).

6.5 Performance degradation (packet loss or increased latency)

Troubleshooting:

Check the port error count (show port statistics), high CRC or Alignment errors indicate physical layer issues.

Check the queue dropout count (show QoS queue stats). If there is an increase in WRED dropout, it indicates congestion and requires adjustment of shaping parameters or expansion.

Check the CPU utilization (show system CPU), if it continues to be>60%, investigate whether there is routing oscillation or SNMP polling overload.

Software Upgrade and Configuration Management

The 7750 SR supports ISSU (In Service Software Upgrade) and utilizes NSR/NSS features to achieve seamless control plane upgrades without interrupting the data plane.

Upgrade process:

Upload the new image to the backup SF/CPM.

Start the new version on the backup controller and wait for it to synchronize with the main completion status.

Execute admin upgrade to trigger primary backup switch, and the new version becomes the active controller.

Verify the business and protocol status, and upgrade the old controller after confirming that there are no errors.

Configuration management:

Use Command Authorization to assign different permissions to different administrators and audit logs to record all operations.

Configure automatic backup (copy to FTP/TFTP/SFTP server).

Before modifying the configuration, use admin save to save the checkpoint for quick rollback by admin.

SDN and OpenFlow support

The 7750 SR supports the OpenFlow 1.0 and 1.3 specifications, allowing the forwarding plane to be separated from the control plane and flow tables to be issued by external controllers such as Nuage Networks VSC or OpenDaylight. This provides a foundation for network virtualization and business orchestration, suitable for data center interconnection and multi tenant scenarios.

Key points for activation:

Configure OpenFlow instance (openflow) and bind physical or logical ports.

Set the controller IP and connection parameters (TLS or TCP).

Define flow table matching fields and actions (forwarding, discarding, modifying VLANs, etc.).