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Cisco Bug: CSCtb74413 - IPv6 General-prefix config stalled after conflict

Last Modified

Mar 06, 2018

Products (1)

  • Cisco ASR 1000 Series Aggregation Services Routers

Known Affected Releases


Description (partial)


A previously-confliciting general-prefix address will not be re-applied to an interface when the conflict is resolved and the interface shut/no shut.
The following example illustrates the problem:

ipv6 general-prefix cisco  2001:DB8::/32 
int e0/0
      ipv6 address  2001:DB8::2/64
int e1/0
      ipv6 address cisco ::1:0:0:0:1/64

The general-prefix address configured on e1/0 conflicts with the address manually-configured on e0/0. When the command is configured on e1/0 an error message will be issued and no address will be applied to interface e1/0. However the configuration will remain on interface e1/0. This is as expected. 

We now remove the source of the conflict by removing the address on e0/0:

int e0/0
    no ipv6 address 2001:DB8::2/64

We now attempt to re-apply the address on e1/0:

int e1/0
    no shut 

The address is not applied to e1/0.
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