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Cisco Bug: CSCvi93463 - Janus Based 6500 & 6800 series linecards stop forwarding traffic with EARL Patch

Last Modified

Jan 24, 2019

Products (1)

  • Cisco Catalyst 6000 Series Switches

Known Affected Releases


Description (partial)

A 6500 or 6800 series switch may see "Earl Patch" errors in the local logs for modules that contain a "Janus" ASIC. This ASIC is primarily used on 1g based modules and a small number of 10g based modules. 

The condition that causes these patches will result in a temporary loss of packet forwarding for a short period of time, which may impact other modules in the system (regardless of their ASICs in use).

Errors will look like the following:
*** Recovery patch is triggered from Firmware by invoke_fw_sys_recovery ***
typedef struct {
    uint32_t comp_id;   -> [0x05001700]
    uint8_t  asic_num;  -> [0x00000000]
    uint8_t  error_type;-> [0x00000001]
    uint32_t reg_offset;-> [0x00000355]
    uint32_t reg_data;  -> [0x00000001]
} sys_err_info_type;

This issue is extremely rare, and has been seen in areas with high amounts of multicast traffic.

There are many reasons you may experience an EARL patch, and not all patches are the same. To verify if you are hitting this specific issue, look at the following data: 

    uint32_t comp_id;   -> [0x05001700]   <-- You must have component 1700
    uint32_t reg_offset;-> [0x00000355]   <-- You must have a register offset of 355
    uint32_t reg_data;  -> [0x00000001]   <--- You must have a data value of 1

If all three of the above conditions have been met then you are hitting this condition. If these values are different, contact TAC for decoding and troubleshooting assistance.
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