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Cisco Bug: CSCvu91092 - mvr-suppress-query trigger IGMP query looping

Last Modified

Sep 18, 2020

Products (58)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 31108TC-V Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 92304QC Switch
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Known Affected Releases

9.2(4)

Description (partial)

Symptom:
When running MVR in conjunction of  mvr-suppress-query we can see a lot of igmp flooding packets:

 show ip igmp snooping event-history vlan | i "Flooding the packet to <vlan 655>" 
2020 Jul  6 18:54:14.517659 igmp [30849]: [30950]: SN: <655> Flooding the packet to <vlan 655> (iif Po300)., mvr enabled
2020 Jul  6 18:54:14.517554 igmp [30849]: [30950]: SN: <655> MVR Flooding the packet to <vlan 655> (iif Po300)., mvr enabled
2020 Jul  6 18:54:14.517533 igmp [30849]: [30950]: SN: <655> Flooding the packet to <vlan 655> (iif Po300)., mvr enabled
2020 Jul  6 18:54:14.517439 igmp [30849]: [30950]: SN: <655> MVR Flooding the packet to <vlan 655> (iif Po101)., mvr enabled
2020 Jul  6 18:54:14.517417 igmp [30849]: [30950]: SN: <655> Flooding the packet to <vlan 655> (iif Po101)., mvr enabled

Conditions:
Using a pair of Nexus 36180 in VPC and a pair Nexus 3636 in VPC.
Using MVR
configuring  mvr-suppress-query  will cause a ton of  mvr-suppress-query packets for the vlan where this command is configured

tested in 9.2.4 release

 sh mod
Mod Ports             Module-Type                       Model          Status
--- ----- ------------------------------------- --------------------- ---------
1    54   48x25G + 6x100G Ethernet Module       N3K-C36180YC-R        active *  

Mod  Sw                       Hw    Slot
---  ----------------------- ------ ----
1    9.2(4)                   1.0    NA  


Mod  MAC-Address(es)                         Serial-Num
---  --------------------------------------  ----------
1    70-70-8b-d2-07-48 to 70-70-8b-d2-07-9b  FOC21504FPV

Mod  Online Diag Status
---  ------------------
1    Pass

* this terminal session
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