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Cisco Bug: CSCvs86871 - Multicast overload expiring after fabric overload causing traffic drop

Last Modified

Aug 28, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 9504 Switch
  • Cisco Nexus 9332C Switch
  • Cisco Nexus 9372TX-E Switch
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Known Affected Releases

14.2(2f)

Description (partial)

Symptom:
Multicast overload expiring after fabric overload

eaf-114_sysid-114_2020-01-16T12-32UTC_logs_3of3/var/sysmgr/tmp_logs$ egrep overload isis-decoded.txt
[2020 Jan 16 03:53:05.664651672:isis_mo_handle_overload_object:1531] Fabric-Overload Started : vrf overlay-1 for 600000msec
[2020 Jan 16 03:53:05.664667210:isis_mo_handle_overload_object:1539] overload done...
[2020 Jan 16 03:53:26.396808506:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 0-0
[2020 Jan 16 03:53:26.404553683:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 0-0
[2020 Jan 16 04:03:05.668735461:isis_clear_overload_timer_expired:2699] Clear overload timer expired
[2020 Jan 16 04:03:05.668742332:isis_change_overload:2658] overload changed for lv_cib lvl 1 cib overlay-1
[2020 Jan 16 04:03:05.668754590:isis_change_lv_overload:2625] GM LSP build timer started: overload bit changed
[2020 Jan 16 04:03:05.668758396:isis_change_overload:2658] overload changed for lv_cib lvl 2 cib overlay-1
[2020 Jan 16 04:03:05.668766090:isis_change_lv_overload:2615] GM LSP DB is NULL
[2020 Jan 16 04:03:07.327679667:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 0-0
[2020 Jan 16 04:03:07.357210679:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 2-0
[2020 Jan 16 04:03:07.357255363:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 2-0
[2020 Jan 16 04:03:07.380163188:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 2-0
[2020 Jan 16 04:04:02.392503249:isis_mcast_overload_timer_expired:2779] MCast Overload-timer expired for overlay-1 รง After fabric overload expired
[2020 Jan 16 04:05:06.946434463:isis_vpc_process_oper_state_msg:3894] ReSet overload Mode on VPC state 2-0

Conditions:
if interfaces comes up very slow we hit this issue
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