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Contents
- IPsec Diagnostics Enhancement
- Finding Feature Information
- Prerequisites for the IPsec Diagnostics Enhancement
- Restrictions for the IPsec Diagnostics Enhancement
- Memory and Performance Impact
- Information About the IPsec Diagnostics Enhancement
- Tracking Packet Processing Within a Switch or Router
- How to Use the IPsec Diagnostics Enhancement
- Displaying the Statistics
- Displaying the Error History
- Clearing the Counters or Error History
- Additional References
- Feature Information for IPsec Diagnostics Enhancement
IPsec Diagnostics Enhancement
The Cisco IPsec Diagnostics Enhancement feature adds four sets of event statistics and an error history buffer to the Cisco IOS software for use in troubleshooting a virtual private network (VPN) that encrypts the data path.
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for the IPsec Diagnostics Enhancement
- You understand the IP security (IPsec) standard for network security.
 Note | Contact the Cisco Technical Assistance Center (TAC) before using this feature. |
Restrictions for the IPsec Diagnostics Enhancement
Information About the IPsec Diagnostics Enhancement
Tracking Packet Processing Within a Switch or Router
Standard packet analyzers used for troubleshooting network issues capture packets between devices in the network but they cannot capture packet processing events inside a device, such as a router. Beginning with Cisco IOS Release 12.4(9)T, Cisco IOS software includes four sets of event statistics to track packet processing within a switch or router. These statistics help Cisco TAC engineers diagnose and resolve issues in encrypted networks. Each set of statistics tracks a different aspect of packet processing within a switch or router:
- Error counters track packet processing errors and associated packet drops. When a packet encounters an error, the first 64 bytes of that packet are stored in a buffer, to facilitate troubleshooting.
- Internal counters show the detailed movement of a packet, end to end, across an encryption data path.
- Punt counters track instances when the configured packet processing method failed, and an alternative method was used.
- Success counters record the data path checkpoints where packets are successfully forwarded.
You can view any one set of statistics, or all of them, or only those that have recorded errors. You must choose the display timeframe for the statistics.
How to Use the IPsec Diagnostics Enhancement
Displaying the Statistics
You can use the show crypto datapathcommand to display statistics that help troubleshoot an encrypted network.
DETAILED STEPS
| Command or Action | Purpose | |
|---|---|---|
Step 1 |
enable
Example: Router> enable |
Enables privileged EXEC mode.
|
Step 2 |
show
crypto
datapath
{ipv4
|
ipv6}
{snapshot | realtime} {all | non-zero}[error | internal | punt | success] Example: Router# show crypto datapath snapshot success |
Displays the statistics from one or more specified counters. Use the keywords to specify the IP version used in the network (IPv4 or IPv6) and to specify whether to capture statistics in real time (realtime) or as of a single point in time (snapshot). You can also choose which statistics to display. The allkeyword displays the output of all the counters, whether they have recorded events or not. The non-zerokeyword displays only the output of counters that have recorded at least one event. Each of the other keywords displays one specific set of statistics, as described in the Information About the IPsec Diagnostics Enhancement. |
Displaying the Error History
You can display the contents of the buffer that stores information from error events to diagnose the cause of errors. The show monitor event-trace command is updated with the cfd(crypto fault detection) keyword as a possible entry for the component argument to help with troubleshooting an encryption data path. Additional keywords allow you to specify the time span for which you want to display events. For example, you can display all events for the last 30 minutes.
For detailed information about the show monitor event-trace command, see the Master Command List.
DETAILED STEPS
Clearing the Counters or Error History
You can use the clear crypto datapath command to clear the counters or error history buffer in an encrypted network. Use the appropriate keywords to clear all counters or one specific counter.
DETAILED STEPS
Additional References
Related Documents
MIBs
Technical Assistance
|
Description |
Link |
|---|---|
|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for IPsec Diagnostics Enhancement
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
| Table 1 | Feature Information for IPsec Diagnostics Enhancement |
|
Feature Name |
Releases |
Feature Information |
|---|---|---|
|
IPsec Diagnostics Enhancement |
12.4(9)T |
This feature adds four sets of event statistics and an error history buffer to the Cisco IOS software for use in troubleshooting a VPN that encrypts the data path The following commands were introduced or modified: clear crypto datapath , show crypto datapath , show monitor event-trace |
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Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.