Release Notes for Cisco Resilient Mesh Release 5.7.27

Compromised Node Eviction

A compromised node is one where the device can no longer be trusted by the network and/or operators. Nodes within an IEEE 802.15.4 PAN must possess the currently valid Group Temporal Key (GTK) to send and receive link-layer messages. The GTK is shared among all devices within the PAN and is refreshed periodically or on-demand. By communicating new GTKs to only trusted devices, compromised nodes may be evicted from the network.

RPL

In its route-over architecture, CG-Mesh performs routing at the network layer using the Routing Protocol for Low-Power and Lossy Networks (RPL).

CG-Mesh requires a Cisco 1000 Series Connected Grid Router (CGR) to provide connectivity to other IPv6 networks. The CGR (Field Area Router (FAR)) must serve as a RPL Directed Acyclic Graph (DAG) root and store information reported in DAO messages to forward datagrams to individual nodes within the mesh network.

6LoWPAN

The 6LoWPAN adaptation layer adapts IPv6 to operate efficiently over low-power and lossy links such as IEEE 802.15.4. The adaptation layer sits between the IPv6 and IEEE 802.15.4 layers and provides IPv6 header compression, IPv6 datagram fragmentation, and optimized IPv6 Neighbor Discovery.

Frequency Hopping

CG-Mesh implements frequency hopping across channels with 400/800-kHz spacing in the 902 to 928 MHz ISM band. The frequency-hopping protocol used by CG-Mesh maximizes the use of the available spectrum by allowing multiple sender-receiver pairs to communicate simultaneously on different channels. The frequency hopping protocol also mitigates the negative effects of narrowband interferers.

Firmware Upgrade Procedure

The CG-Mesh Bridge firmware can be installed by CLI or from Cisco IoT Field Network Director (FND).

For more information on upgrading the firmware, see the Release Notes for Cisco 1000 Series Connected Grid Routers for Cisco IOS Release 15.7(3)M1 at: www.cisco.com/go/cgr1000-docs.

FND Configuration

CG-Mesh solution is managed and monitored by the IoT FND, which provides the necessary backend network configuration, monitoring, event notification services, network stack firmware upgrade, as well as FND outage and meter registration. IoT FND also retrieves statistics on network traffic from the interface.

For more information on using IoT FND, refer to the Cisco IoT Field Network Director User Guide, Release 4.0.x.

Note For a detailed description on the CG-Mesh CLI, refer to Cisco Connected Grid WPAN Module for CGR 1000 Series Installation and CG-Mesh Configuration Guide (Cisco IOS).

CoAP Simple Management Protocol

CG-Mesh implements the CoAP Simple Management Protocol (CSMP) for remote configuration, monitoring, and event generation over the IPv6 network. The CSMP service is exposed over both the mesh and serial interfaces.

Power-outage Notification

CG-Mesh supports timely and efficient reporting of power outages and restorations.

In the event of a power outage, CG-Mesh enters power-outage notification mode and the node stops listening for traffic to conserve energy. CG-Mesh triggers functions to conserve energy by notifying the communication module and neighboring nodes of the outage. The outage notification is sent using the same security settings as any other UDP/IPv6 datagram transmission.

In the event of a power restoration, a CG-Mesh node sends a restoration notification using the same communication method as the outage notification. The communication modules unaffected by the power outage event deliver the restoration notification.

Registration of Endpoint

You can register and manage CG-Mesh Endpoints (CGEs) such as (meters) using the CSMP protocol.

Open Caveats

This section summarizes open caveats specific to the CG-mesh.

• CSCvg13367

Node could not display more than 13 PLC hardware link neighbors in TLV95.

• CSCvg87873

1/1000 Duplicated Packets on PLC media when node have only one parent.

• CSCvh03696

Node probably fails to sync with bcast schedule in master-slave mode.

Resolved Caveats

This section summarizes resolved caveats specific to the CG-mesh.

Accessing Bug Search Tool

You can use the Bug Search Tool to find information about caveats for this release, including a description of the problems and available workarounds. The Bug Search Tool lists both open and resolved caveats.

To access Bug Search Tool, you need the following items:

• Internet connection
• Web browser
• Cisco.com user ID and password

To access the Bug Search Tool, enter the following URL:

https://tools.cisco.com/bugsearch/search

Accessing Error Message Decoder

You can look up explanations for console error message strings found in system logs at the following location: http://www.cisco.com/en/US/partner/support/tsd_most_requested_tools.html

Hardware Overview and Installation

• Cisco CG-OS Release Notes for CGR 1000

http://www.cisco.com/go/cgr1000-docs

• Cisco Connected Grid Module Guides
  http://www.cisco.com/go/cgmodules
• Cisco CGR 1240 Hardware Installation Guide

http://www.cisco.com/go/cgr1000-docs

• Cisco CGR 1120 Hardware Installation Guide

http://www.cisco.com/go/cgr1000-docs

• Cisco IR500 Series WPAN Gateway and WPAN Range Extender

https://www.cisco.com/c/en/us/support/routers/500-series-wpan-industrial-routers/tsd-products-support-series-home.html

Supported Cisco Antennas and Accessories

Cisco CGR 1000 and 2000 Series Connected Grid Antennas Guides http://www.cisco.com/en/US/docs/routers/connectedgrid/antennas/installing/cg_antenna_install_guide.html

Regulatory, Compliance, and Safety Information

Cisco Network Modules and Interface Cards Regulatory Compliance and Safety Information

http://www.cisco.com/en/US/docs/routers/access/interfaces/rcsi/IOHrcsi.html

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Cisco Bug Search Tool

Cisco Bug Search Tool (BST) is a web-based tool that acts as a gateway to the Cisco bug tracking system that maintains a comprehensive list of defects and vulnerabilities in Cisco products and software. BST provides you with detailed defect information about your products and software.