The Cisco NCS 520 Series Ethernet Access Device is a family of low cost, fixed Carrier Ethernet Network Interface Devices (NID) and a switch that is targeted to be the next generation replacement of the Cisco ME 3400 series Access Switches. The Cisco NCS 520 Series Ethernet Access Device adds 10G NID and low-cost MBH switch to the existing Service Provider Access portfolio, with the following features:

• MEF CE 3.0 compliant

• Premium SKUs with support for extended temperature (from -40C to 65C)

• Conformal coating on the PCBAs (to be able to support installation in ventilated enclosures)

This release note contains information about the Cisco NCS 520 Series Ethernet Access Device, provides features information for these devices, hardware support, limitations and restrictions, and caveats.

This release note provides information for these variants of the Cisco NCS 520 Series Ethernet Access Device:

• N520-4G4Z-A (Base)

• N520-X-4G4Z-A (Premium)

• N520-X-4G4Z-D (Premium)

• N520-20G4Z-A (Base)

• N520-20G4Z-D (Base)

• N520-X-20G4Z-A (Premium)

• N520-X-20G4Z-D (Premium)

Rearrangement in the Configuration Guides

• The following are the modifications in the CEM guides.

  • Introduction of the Alarm Configuring and Monitoring Guide:

    This guide provides the following information:

    • Alarms supported for SONET and SDH, and their maintenance

    • Alarm profiling feature

    • Auto In-Service States for cards, ports, and transceivers

  • Rearrangement of Chapter and Topics in the Alarm Configuring and Monitoring Guide:

    • The Auto In-Service States Guide is now a chapter inside the Alarms Configuring and Monitoring Guide.

    • Alarms at SONET Layers topic in the following CEM guides, is added to the Alarms Configuring and Monitoring Guide:

      • 1-Port OC-48/STM-16 or 4 port OC-12/OC-3 / STM-1/STM-4 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide

    • The Alarm History and Alarm Profiling chapters are removed from the below CEM Technology guides, and added into the Alarm Configuring and Monitoring Guide:

      • 1-Port OC-48/STM-16 or 4 port OC-12/OC-3 / STM-1/STM-4 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide

Note

The error message "PLATFORM-1-NOSPACE: SD bootflash : no space alarm assert" may occur in the following scenarios: Any sector of SD Card gets corrupted Improper shut down of router power outage. This issue is observed on platforms which use EXT2 file systems. We recommend performing a reload of the router. As a result, above alarm will not be seen during the next reload due to FSCK(file systems check) execution. However, If the error persists after a router reload, we recommend to format the bootflash or FSCK manually from IOS.

• The default interface command is used to default the parameters under that interface. However, when speed is configured on the interface, the following error is displayed:

  Speed is configured. Remove speed configuration before enabling auto-negotiation

• Adding or deleting the Trunk Ethernet flow points (TEFPs) with scaled bridge-domain, without delay causes the Cisco NCS 520 Series Ethernet Access Device to crash.

• Virtual services should be deactivated and uninstalled before performing replace operations.

• The controller and nid-controller commands are not supported.

• Cisco NCS 520 Series Ethernet Access Device displays an error in Hierarchical QoS policy while trying to remove the bandwidth and bandwidth percent commands from the default parent class dynamically. To remove the commands, you must first remove the bandwidth from child class and then from the parent class.

• When port is in OPER-DOWN state, applying Hierarchical QoS followed by speed change sets wrong bandwidth values on standard queues. To work around the mismatch, you must reattach the policy to the port level again.