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Wednesday, April 21, 2010

%EARL_L3_ASIC-SP-3-INTR_WARN: EARL L3 ASIC: Non-fatal interrupt Packet Parser block interrupt error


We found this log on Switch 6500 at below.
%EARL_L3_ASIC-SP-3-INTR_WARN: EARL L3 ASIC: Non-fatal interrupt Packet Parser block interrupt. Can someone help us understand why this error message is issued? Any possible workaround that you can recommend to resolve this? Thanks.

The error message %EARL_L3_ASIC-SP-3-INTR_WARN indicates that the Enhanced Address Recognition Logic (EARL) Layer 3 (L3) application-specific integrated circuit (ASIC) detected an unexpected non-fatal condition. This indicates that a bad packet, probably a packet which contains a Layer 3 IP checksum error, was received and dropped. The cause of the issue is a device on the network that sends out bad packets. These issues, among others, can cause the bad packets: Bad NICs; Bad NIC drivers; Bad applications

In older Cisco IOS Software releases, these packets are normally dropped without being logged.
The feature of logging error messages about this problem is a feature found in Cisco IOS Software Release 12.2SX and later.

As a workaround, use one of these two options:

Use a network sniffer in order to identify the source that sends out the erroneous packets. Then, resolve the issue with the source device or application.

Disable Layer 3 error checks in the switch hardware for:

Packet checksum errors

Packet length errors

Packets that have the same source and destination IP addresses

Use the no mls verify command to stop these error checks, as these examples show:

Switch(config)#no mls verify ip checksum

!--- This configures the switch to discontinue checks for packet
!--- checksum errors.

Switch(config)#no mls verify ip length {consistent | minimum}

!--- This configures the switch to discontinue checks for packet
!--- length errors.

Switch(config)#no mls verify ip same-address

!--- This configures the switch to discontinue checks for packets that have the
!--- same source and destination IP addresses.

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