IPv6 addressing for core network

Wed Feb 9 10:50:32 UTC 2011

On Wed, 9 Feb 2011, sthaug at nethelp.no wrote:

>>> A /127 mask is still the best way to handle real point-to-point links
>>> like SDH/SONET today, to avoid the ping-pong problem. Works fine with
>>> Cisco and Juniper, not tried with other vendors.
>>
>> I know it's immature, but I can't wait for some new hire at vendor C or vendor J to reread the RFCs and implement the all routers anycast address according to spect and then see sparks fly.
>>
>> Like I said, global scope addresses on your router-to-router interfaces is such IPv4 thinking.
>
> Global scope addresses on router-to-router interfaces are necessary
> today for traceroute to work. Some ISPs are *requiring* working
> traceroute (without MPLS hiding of intermediate hops) in RFPs to
> transit providers.
>
> If you can get router ICMP handling changed such that the ICMP packet
> generated by traceroute is sent from the loopback address, we might
> be able to do without global scope addresses on router-to-router
> interfaces. But until then...

You can do it on C and J vendor. Without link-local ICMPv6 will use 
loopback0.  Example on  C:
ipv6 unnumbered loopback0

Best Regards,
 		Janos Mohacsi