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Cisco Bug: CSCvt19386 - DHCP packets received on trusted port punted to CPU + DST MAC set to broadcast in case of bcast bit

Last Modified

Aug 04, 2020

Products (65)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 3548-X Switch
  • Cisco Nexus 93600CD-GX Switch
  • Cisco Nexus 92348GC-X Switch
  • Cisco Nexus 3548 Switch
  • Cisco Nexus 3636C-R Switch
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 3132Q-V Switch
  • Cisco Nexus 3064 Switch
  • Cisco Nexus 3548-XL Switch
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Known Affected Releases

7.0(3)I7(7) 9.2(4) 9.3(3)

Description (partial)

When a DHCP packet arrives on a trusted port (DHCP snooping enabled for the VLAN), the packet gets punted to the CPU. If the broadcast bit is set, the CPU re-writes the destination MAC as the broadcast MAC address.

For Punt to CPU: DHCP snooping enabled for the vlan.

For destination mac re-write: the DHCP snooping enabled for the vlan+ DHCP broadcast bit needs to be set.
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