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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

Gibraltar-16.11.1

Description (partial)

Symptom:
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

Conditions:
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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Bug Details Include

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