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Multiple link flaps observed along with EX-ports going down on Brocade switch

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Applies to

Brocade Switch

Issue

  • Multiple link flaps observed on Brocade switch along with both the EX-ports going down causing fabric disruption as multiple domains were unrecahable.
  • This kind of events can be observed as “BF – build fabric” events in the switch logs under Fabriclog output and the status will be passed on through the ISL ports on the switches of the fabric as shown in the below snippet:

Switch 0; Tue Sep 13 11:03:24 2022 IST (GMT+5:30)
11:03:24.283511 BF Rcv                                      A2,P3  A2,P3  46    0xaa1 
11:03:24.283918 BF sending ACC                              F0,P3  F0,P3  46    0xaa1 
11:03:24.284541 *BF Flood                                   F0,NA  F0,NA  NA    NA    
11:03:24.284658 *BF Send:iu=0x19dce2b0                      F0,P3  F0,P3  0     0x1b71
11:03:24.284758 *BF Send:iu=0x19dd28a0                      F0,P3  F0,P3  38    0x7e37
11:03:24.285039 *BF Send:iu=0x19dd2b90                      F0,P3  F0,P3  96    0x5c42
11:03:24.288801 BF ACC Rcv                                  F0,P3  F0,P3  38    0x7e37
11:03:24.288818 BF ACC Rcv                                  F0,P3  F0,P3  96    0x5c42
11:03:24.289342 SCN Domain 102 invalid                      F0,NA  F0,NA  NA    NA    
11:03:24.290925 BF ACC Rcv                                  F0,P3  F0,P3  0     0x1b71
11:03:25.401576 SCN Domain 1 reachable                      F0,NA  F0,NA  NA    NA    
11:03:41.566052 SCN Domain 102 valid                        A2,NA  A2,NA  NA    NA    
11:03:41.616345 SCN Domain 1 available                      A2,NA  A2,NA  NA    NA    
11:03:41.623640 SCN Domain 200 available                    A2,NA  A2,NA  NA    NA    
11:03:41.629084 SCN Domain 1 available                      A2,NA  A2,NA  NA    NA    
11:03:41.653521 BF Rcv                                      A2,P3  A2,P3  46    0xb6f 
11:03:41.653914 BF sending ACC                              F0,P3  F0,P3  46    0xb6f 
11:03:41.654520 *BF Flood                                   F0,NA  F0,NA  NA    NA    
11:03:41.654615 *BF Send:iu=0x19dce2b0                      F0,P3  F0,P3  0     0x609d
11:03:41.654709 *BF Send:iu=0x19dcde90                      F0,P3  F0,P3  38    0x6bf9
11:03:41.655198 *BF Send:iu=0x19dd1d90                      F0,P3  F0,P3  96    0x786b
11:03:41.665608 BF ACC Rcv                                  F0,P3  F0,P3  38    0x6bf9
11:03:41.665624 BF ACC Rcv                                  F0,P3  F0,P3  0     0x609d
11:03:41.665633 BF ACC Rcv                                  F0,P3  F0,P3  96    0x786b
                            

 

 

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