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Cisco Bug: CSCvs22896 - DHCPv6 RELAY-REPLY packet is being dropped

Last Modified

Jul 25, 2020

Products (66)

  • Cisco IOS
  • Cisco Catalyst 9400 Supervisor Engine-1XL-Y
  • Cisco Catalyst 9300-48T-A Switch
  • Cisco Catalyst 9200L-48PXG-2Y Switch
  • Cisco Catalyst 9410R Switch
  • Cisco Catalyst 9200L-48P-4X Switch
  • Cisco Catalyst 9300-48P-A Switch
  • Cisco Catalyst 9300-48UXM-A Switch
  • Cisco Catalyst C9500-32QC Switch
  • Cisco Catalyst 9300-48U-A Switch
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Known Affected Releases


Description (partial)

End clients connected to DHCPv6 Relay sends DHCPv6 INFORMATION-REQUEST packet for getting additional network information such as DNS-Server-Addresses. Catalyst 9500 acting as DHCP-Relay is sending DHCPV6 RELAY-FORWARD message to DHCPv6-Server.DHCPv6-Server is answering correctly with an DHCPv6 RELAY-REPLY which arrives at cat 9500, however it is not forwarded to the end client

Catalyst 9500 acting as DHCPv6 Relay running 16.11.1 or any 16.12 (16.12.1 up to 16.12.3a) versions
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