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When are "EALP" events observed on Brocade switch?

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Applies to

Brocade Switch

Answer

  • EALP stand for "Exchange Active Link Parameters" and this is supported only on the version that has Traffic Optimizer (FOS v9.1 and above).
  • The EALP events are exchanged during port group operation by the traffic optimizer or when a switch joins or rejoins a fabric and are informational in nature.

Additional Information

  • EALP mesaages logged under fabric log on switch end as shown below:

Switch 0; Tue Dec  5 21:38:17 2023 IST (GMT+5:30)
21:38:17.258931 SCN T_PORT g=0x36                           A2,P3  A2,I4  288   NA
21:38:17.259728 Node Add:nd=0x19ed5e28,iu=0x19ed7830        A2,P3  A2,P3  288   0xa1
21:38:17.259729 AsyncCmd:nd=0x19ed5e28,iu=0x19ed7830        A2,P3  A2,P3  288   0xa1
21:38:17.259731 EALP Send:sz=3648,len=2560,vc=64            A2,P3  A2,P3  288   0xa1
21:38:17.259745 SCN T_PORT g=0x38                           A2,I4  A2,I4  289   NA
21:38:17.259745 EALP exchange skipped:f=2                   A2,I4  A2,I4  289   NA
21:38:17.259765 SCN T_PORT g=0x3a                           A2,P3  A2,I4  430   NA
21:38:17.260383 Node Add:nd=0x19dfff50,iu=0x19ed8708        A2,P3  A2,P3  430   0x9f
21:38:17.260384 AsyncCmd:nd=0x19dfff50,iu=0x19ed8708        A2,P3  A2,P3  430   0x9f
21:38:17.260385 EALP Send:sz=3648,len=2560,vc=64            A2,P3  A2,P3  430   0x9f
21:38:17.260399 SCN T_PORT g=0x3c                           A2,I4  A2,I4  431   NA
21:38:17.260399 EALP exchange skipped:f=2                   A2,I4  A2,I4  431   NA
21:38:17.273176 EALP ACC Rcv:flow=4,flen=2560,size=3648     A2,P3  A2,P3  288   0xa1
21:38:17.283655 Node Free:nd=0x19ed5e28,iu=0x19ed7830       A2,P3  A2,P3  288   0xa1
21:38:17.285601 EALP ACC Rcv:flow=4,flen=2560,size=3648     A2,P3  A2,P3  430   0x9f
21:38:17.304160 Node Free:nd=0x19dfff50,iu=0x19ed8708       A2,P3  A2,P3  430   0x9f
21:38:17.315757 SCN T_PORT g=0x36                           A2,P3  A2,I4  288   NA
21:38:17.324069 Node Add:nd=0x19dfff50,iu=0x19ed7830        A2,P3  A2,P3  288   0xa0
21:38:17.324070 AsyncCmd:nd=0x19dfff50,iu=0x19ed7830        A2,P3  A2,P3  288   0xa0
21:38:17.324072 EALP Send:sz=3648,len=2560,vc=64            A2,P3  A2,P3  288   0xa0

 

  • The Traffic Optimizer feature tries to optimise the SAN traffic.
  • From Fabric OS 9.1.0 and above, the Traffic Optimizer feature is enhanced to provide the following advanced features to efficiently optimize SAN traffic:

1. Protocol-based (SCSI/NVMe) traffic flow classification
2. Oversubscribed device isolation (OS)

Refer: Fabric OS Administration Guide

 

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