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CRC errors in Catalyst 2900 and cisco 7200

I have an isl link between a cayalyst 2900 and a cisco 7200 and i see crc errors in the catalyst but not in the router.

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Cisco Employee

Re: CRC errors in Catalyst 2900 and cisco 7200

CSCdm49462 CRCs incrementing on CAT 2900xl when 2600/3600 keepalives on.

Release-notes: When ISL trunking between a 2600/3600 (and 7200) and a 2900xl switch the CRC counter increments. Turning off keepalives on the router side causes the counters to stop incrementing. This happens because the router sends the keepalives out *unencapsulated* in ISL so the switch goes to strip off the ISL header and finds a CRC.

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