[c-nsp] IPv6 duplicate address

[Hank Nussbacher]

When we did some line testing and did some loop testing on the link we got:
%IPV6-4-DUPLICATE: Duplicate address FE80::215:2CFF:FE87:B240 on POS11/0/0

petach-tikva-gp# sho ipv6 int pos11/0/0
POS11/0/0 is up, line protocol is up
   IPv6 is stalled, link-local address is FE80::215:2CFF:FE87:B240 [DUP]
   Description: STM-16 to GEANT2 DE POP
   Global unicast address(es):
     2001:798:14:10AA::1E, subnet is 2001:798:14:10AA::1C/126 [TEN]
The interface entered the stall state and did not leave stalled state until 
IPv6 addressing was disabled and reenabled on the link.

In:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t2/ipv6/ftipv6c.htm#10168
Cisco states "An interface returning to administratively "up" restarts 
duplicate address detection for all of the unicast IPv6 addresses on the 
interface."  It would appear if an interface goes from up (looped) to up 
(non-looped), IOS does not check for dup addresses and the interface stays 
stalled.  Is this how it should be or is this an IOS bug (12.2(18)SXF11)?

I know I can use "ipv6 nd dad attempts 5" but wanted to know whether I 
should open a TAC case for this.

Thanks,
Hank