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Cisco Bug: CSCuj98034 - CLI should NOT allow configuration of IPv6 DHCP server on Loopback

Last Modified

Feb 06, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

15.3(2)T1.2

Description (partial) 

Symptom:
The CLI allows for the DHCPv6 server to be configured on a Loopback interface, but this is NOT a valid configuration. 

If a DHCPv6 relay relays a DHCPv6 request to this device, using as destination a Loopback address, a message similar to the following will be seen if "debug ipv6 dhcp detail" is enabled on the DHCPv6 server device:

IPv6 DHCP: Server/relay not enabled on GigabitEthernet0/0

The "GigabitEthernet0/0" interface will depend on the specific device configuration, and refers to the interface on which the DHCPv6 relay packet arrived

Conditions:
A DHCPv6 server is configured on a Loopback interface and a DHCPv6 relay is trying to relay a DHCPv6 request using as destination the Loopback interface IPv6 address
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