Cisco crypto engine software ipsec

If you choose to disable crypto conditional debugging, you must first disable any crypto global debug CLIs you have issued ; thereafter, you can disable conditional debugging. The reset keyword can be used to disable all configured conditions at one time. Optional Displays debug conditional crypto messages when no context information is available to check against debug conditions. Enabling the debug crypto error command displays only error-related debug messages, thereby, allowing you to easily determine why a crypto operation, such as an IKE negotiation, has failed within your system.

When enabling this command, ensure that global crypto debug commands are not enabled; otherwise, the global commands will override any possible error-related debug messages. The following example shows how to display debug messages when the peer IP address is This example also shows how to enable global debug crypto CLIs and enable the show crypto debug-condition command to verify conditional settings. The following example shows how to disable all crypto conditional settings and verify that those settings have been disabled:.

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. 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.

Skip to content Skip to search Skip to footer. Book Contents Book Contents. Find Matches in This Book. PDF - Complete Book 3. Updated: January 21, Chapter: Crypto Conditional Debug Support. The name string of an IPv4 or IPv6 local address. Provides information about crypto sessions. Option to Disable Hardware Crypto Engine Failover The Option to Disable Hardware Crypto Engine Failover to Software Crypto Engine feature allows you to configure your router so that the hardware crypto engine does not automatically fail over to the software crypto engine.

Enter your password if prompted. Step 2 configure terminal Example: Router configure terminal Enters global configuration mode. Step 3 no crypto engine software ipsec Example: Router config no crypto engine software ipsec Disables hardware crypto engine failover to the software crypto engine.

Was this Document Helpful? Yes No Feedback. This feature was introduced. Step 1. Enables privileged EXEC mode. Step 2. Enters global configuration mode. Step 3. The access lists on each peer needs to mirror each other all entries need to be reversible. This example illustrates this point. This message appears if the phase 2 IPsec does not match on both sides. This occurs most commonly if there is a mismatch or an incompatibility in the transform set. This message indicates that the peer address configured on the router is wrong or has changed.

Verify that the peer address is correct and that the address can be reached. This error message appears normally with the corresponding VPN Concentrator error message Message: No proposal chosen This is a result of the connections being host-to-host. The router configuration has the IPsec proposals in an order where the proposal chosen for the router matches the access list, but not the peer. The access list has a larger network that includes the host that intersects traffic.

In order to correct this, make the router proposal for this concentrator-to-router connection first in line. This allows it to match the specific host first. This could be a temporary condition due to:.

Recommended Action: The peer might not acknowledge that the local SAs have been cleared. If a new connection is established from the local router, the two peers can then reestablish successfully. Otherwise, if the problem occurs for more than a brief period, either attempt to establish a new connection or contact the peer's administrator.

In order to ensure that they both match, check the output from the debug command. In the debug command output of the proposal request, the corresponding access-list permit ip The access list is network-specific on one end and host-specific on the other.

If the configured ISAKMP policies do not match the proposed policy by the remote peer, the router tries the default policy of A user receives either the Hash algorithm offered does not match policy! This usually happens when the packet is corrupted in any way. If you occasionally encounter this error message you can ignore it. However if this becomes more frequent, then you need to investigate what is actually corrupting the packet.

This can be due to a defect in the crypto accelerator. This error message is encountered when there is a transform set mismatch. Ensure that matching transform sets are configured on both peers. This error message occurs when the Phase 2 IPSec parameters are mismatched between the local and remote sites. In order to resolve this issue, specify the same parameters in the transform set so that they match and successful VPN establishes. Fragmentation —Fragmented crypto packets are process switched, which forces the fast-switched packets to be sent to the VPN card ahead of the process-switched packets.

If enough fast-switched packets are processed ahead of the process-switched packets, the ESP or AH sequence number for the process-switched packet gets stale, and when the packet arrives at the VPN card, its sequence number is outside of the replay window. This causes either the AH or ESP sequence number errors and , respectively , dependent on which encapsulation you use. Stale cache entries —Another instance in which this could possibly happen is when a fast-switch cache entry gets stale and the first packet with a cache miss gets process switched.

One workaround that really applies to the reason mentioned in item 1 above is to set the maximum transmission unit MTU size of inbound streams to less than bytes. Enter this command in order to set the maximum transmission unit MTU size of inbound streams to less than bytes:. In order to remove fast switching you can use this commands in interface configuration mode:.