Description

MX104 AFEB which is the forwarding Engine (PFE) of this chassis failed to boot up due to BIST test failing the DDR Memory tests


Symptoms

Below logs will be seen during the AFEB boot up when BIST test is failing during the DDR memory test


Aug 17 02:00:13 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Expected Data: 0x00000000000000005656000049495656

Aug 17 02:00:13 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Vector Data: 0x00000000000000000000000000008000

Aug 17 02:00:13 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Error Vector: 0x00000000000000000000000000008000

Aug 17 02:01:50 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Memory Error

Aug 17 02:01:50 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Test Name:Unique Address (Bottom-Up)

Aug 17 02:01:50 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Error Count: 1

Aug 17 02:01:50 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Error Address: Raw: 0x0000000001240158 Cell: 0x0000000000049005, Burst: 0, Bank: 3

Aug 17 02:01:50 router : %PFE-3: afeb0 RamBIST:MQ-CHIP[0] DMC 0 DDR 3 BIST: Actual Data: 0x000000000000

Solution

This is Hardware issue with the AEB which is built-in MX104 chassis and due to AFEB not coming up MIC's also will fail

Recommendation is to replace the chassis

Modification History

9/14/2023 : KB CREATED