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Cisco Bug: CSCvt52929 - vxlan packets are classified as punted to cpu and hitting the redirect ACL- SOD_CAP

Last Modified

Oct 06, 2020

Products (65)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 92304QC Switch
  • Cisco Nexus 92160YC-X Switch
  • Cisco Nexus 31108TC-V Switch
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Known Affected Releases

9.3(3)

Description (partial)

Symptom:
elam report shows that the packet that needs to be vxlan encapsulated is shown with below fields
<snip>
DC2-VTEP(TAH-elam-insel6)# report
ELAM not triggered yet on slot - 1, asic - 0, slice - 0

HEAVENLY ELAM REPORT SUMMARY
slot - 1, asic - 0, slice - 1
============================

Incoming Interface: Eth1/1
Src Idx : 0x1, Src BD : 144
Outgoing Interface Info: dmod 1, dpid 116
Dst Idx : 0x9, Dst BD : 144

Packet Type: IPv4

Dst MAC address: 00:00:00:00:14:41
Src MAC address: 00:00:00:00:14:42
.1q Tag0 VLAN: 144,  cos = 0x0

Sup hit: 1,  Sup Idx: 3583  >>>>>>>>

Dst IPv4 address: 172.16.144.1
Src IPv4 address: 172.16.144.2

DC2-VTEP(config-monitor)# sh syst intern access-list sup-redirect-stats  | in 358
    3582                                           SOD_CAP    46394
</snip>

The actual packet may not be software switched; However, elam shows it as punted to CPU with an index pointing to SOD_CAP(SOD-> Span-on-Drop)

Conditions:
Nexus 93180 or Nexus 93240YC-FX2 or FX
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