- Preface
- CPwE Parallel Redundancy Protocol Overview
- CPwE Parallel Redundancy Protocol Design Considerations
- CPwE Parallel Redundancy Protocol Configuration
- CPwE Parallel Redundancy Protocol Monitoring and Troubleshooting
- References
- Test Hardware and Software
- Acronyms
- About the Cisco Validated Design Program
Deploying Parallel Redundancy Protocol within a Converged Plantwide Ethernet Architecture CVD
Bias-Free Language
The documentation set for this product strives to use bias-free language. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. Learn more about how Cisco is using Inclusive Language.
- Updated:
- November 11, 2019
Chapter: CPwE Parallel Redundancy Protocol Monitoring and Troubleshooting
CPwE Parallel Redundancy Protocol Monitoring and Troubleshooting
This chapter describes management tools and diagnostic information available to monitor and troubleshoot PRP status and operation, including DANs, VDANs, and RedBox IES.
PRP information can be obtained using Stratix IES Device Manager, Cisco CLI commands, Studio 5000 Logix Designer Add-on Profiles (AOP), CIP message diagnostic and IACS device webpages.
RedBox IES
This section provides PRP information available from a RedBox IES via Device Manager webpage or CLI commands.
Device Manager
Stratix RedBox IES provides information about connected VDANs on the Device Manager Monitor->Status ->PRP page. The VDAN MAC addresses are learned automatically from the switch MAC table. The RedBox IES sends PRP supervisory frames for each VDAN via the PRP channel ports.
RedBox IES learns about DANs and SANs in the network from the supervisory frames received on the PRP channel ports. These frames are propagated within a VLAN as special Layer 2 multicast frames.
The DAN and SAN information can be viewed on the Monitor->Status->PRP page.
- Time To Live (TTL) value shows the number of seconds since the last received frame. Node entries age out and are removed from the tables after 60 seconds.
- The switch supports a maximum of 512 SAN and DAN entries in the Node table. If the Node table is full, the switch treats new nodes as a DAN by default.
- The switch supports a maximum of 512 VDAN entries in the VDAN table. If the VDAN table is full, the switch cannot send supervisory frames for new VDANs.
- In a multi-VLAN network with PRP channel ports in the trunk mode, the RedBox IES receives supervisory frames and displays information about nodes in all VLANs enabled on the trunk
- The number of DAN packets received from LAN A and LAN B should be the same or very close in a normally functioning network. The increasing difference may be due to dropping packets in one of the LANs and may require further troubleshooting.
- There should be no Wrong Packets entries. If any exist and are increasing, this indicates incorrect cabling of a DAN or a RedBox.
Note
DANs, SANs, and VDANs can be manually added to and deleted from the corresponding tables on the Configure->PRP page. Normally dynamic learning should be sufficient. Static configuration may be needed only if PRP devices do not support supervisory frames.
Command Line Interface
CLI diagnostics commands for PRP provide more detailed information for troubleshooting.
- show prp statistics egress command shows detailed packet counts and byte counts for transmitted frames over the PRP channel.
- show prp statistics ingress command shows detailed packet counts and byte counts for different types of frames received on the PRP channel.
– Loss of communication for three seconds on one LAN, but not the other. This condition applies to traffic from all nodes. The condition is cleared once communication is restored for three seconds.
– Node status is active on one LAN but not the other. This means that no packets were received from one of the PRP nodes in the switch table (DANs or VDANs) on one of the LANs for three seconds. The condition is cleared once packets are received again within three seconds.
– Packets from a wrong LAN were received on one of the ports in the past second. The condition is cleared once no wrong packets are received for one second.
– Warning counts and wrong LAN counts show total number of faults since the last reset of counters.
- show prp statistics ptp command displays PTP traffic counters for the PRP channel (which is sent and received independently on each port, bypassing PRP duplication mechanism).
- clear prp statistics command resets all PRP counters and could be useful when troubleshooting an ongoing problem with PRP communication.
- show prp node-table statistics command provide warning status and received count per LAN for each PRP node learned by the RedBox, including DANs, SANs, remote VDANs, and other RedBoxes.
Figure 4-3 Node Table Statistics
Studio 5000 Logix Designer
Studio 5000 Logix Designer Add-on Profile provides PRP diagnostics, counters, and node information for PRP-enabled devices in the controller I/O tree.
The AOP for a Stratix RedBox IES displays PRP warning status and total counters for the PRP channel. This information is available in the AOP for Stratix IOS version 15.2(6)E2a or later.
The AOP for a PRP EtherNet/IP module displays the PRP network status, total counters, and the node table with node status. IP addresses are displayed for PRP nodes in the I/O tree, otherwise only MAC addresses are shown.
Below is an example of the PRP status page for the 1756-EN2TP module.
The AOP for the FLEX 5000TM EtherNet/IP adapter also includes a last PRP fault time stamp data (connection type “Status with PRP”).
Figure 4-6 Flex 5000 Module AOP
The PRP warning status for a PRP EtherNet/IP module or a RedBox can be obtained by the controller program by sending a CIP message to the device. Parameters for the message instruction are shown in Table 4-1 .
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Note PRP-enabled EtherNet/IP modules also provide PRP diagnostics via webpages, similar to data available in the AOP. Depending on the platform and the firmware version, web access to the module may need to be enabled explicitly.
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