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Repeated logs when ELRP Loop detected

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TitleRepeated logs when ELRP Loop detected
Objective
  • We could notice huge flood of ELRP loop detected logs when  upgrade from older version EXOS 15.3.1.4-patch1-21 to newer version above EXOS 15.3.5.2 Patch1-7

  • However, with the older EXOS 15.3.1.4-patch1-21 version the behaviour was different. The ELRP loop detected logs were recorded every 3 seconds.

    Logs when the switch running in EXOS 15.3.1.4-patch1-21 version:

    SW-1.12 # sh log
    07/13/2015 12:39:47.24 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 609 transmited, 2858153 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:39:44.24 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 606 transmited, 2835423 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:39:41.24 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 603 transmited, 2813654 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:39:38.24 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 600 transmited, 2793487 received, ingress slot:port (1) egress slot:port (1)

     
    Logs when the switch running in EXOS 15.3.5.2 Patch1-7 version:


    SW-1.9 # sh log
    07/13/2015 12:44:58.99 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 66 transmitted, 214 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:44:58.99 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 66 transmitted, 213 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:44:58.98 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 66 transmitted, 200 received, ingress slot:port (1) egress slot:port (1)
    07/13/2015 12:44:58.98 <Warn:ELRP.Report.Message> [CLI:test:1] LOOP DETECTED : 66 transmitted, 199 received, ingress slot:port (1) egress slot:port (1)

     

 

Environment
  • EXOS 16.1.3.6 Patch1-8

  • EXOS 15.3.5.2 Patch1-7

  • BD-8810

  • Summit X460-48p

Procedure
  • The CR#xos0064923 has been created to improve the log message behaviour such that LOOP detected logs won’t be triggered for same ports for a given threshold time.

CR Abstract:- "ELRP logs needs to be throttled port wise"

  • Please refer the CR for more information on fix versions or contact GTAC for assistance.

Additional notes

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