using "reserved" IPv6 space

TJ trejrco at
Fri Jul 13 15:05:40 UTC 2012

On Fri, Jul 13, 2012 at 10:38 AM, -Hammer- <bhmccie at> wrote:

> OK. I'm pretty sure I'm gonna get some flak for this but I'll share this
> question and it's background anyway. Please be gentle.
> In the past, with IPv4, we have used reserved or "non-routable" space
> Internally in production for segments that won't be seen anywhere else.
> Examples? A sync VLAN for some FWs to share state. An IBGP link between
> routers that will never be seen or advertised. In those cases, we have
> often used It's reserved and never used and even if it did
> get used one day we aren't "routing" it internally. It's just on segments
> where we need some L3 that will never be seen.
> On to IPv6
> I was considering taking the same approach. Maybe using 0100::/8 or
> 1000::/4 or A000::/3 as a space for this.

Would using "just" Link Locals not be sufficient?
*(Failing that, as others noted, ULAs are the next "right" answer ... )*

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