[137250] in North American Network Operators' Group
Re: Ipv6 addressing for Core network
daemon@ATHENA.MIT.EDU (Vikas Sharma)
Thu Feb 10 10:14:32 2011
In-Reply-To: <5A6D953473350C4B9995546AFE9939EE0BC1393F@RWC-EX1.corp.seven.com>
Date: Thu, 10 Feb 2011 20:43:38 +0530
From: Vikas Sharma <vikassharmas@gmail.com>
To: George Bonser <gbonser@seven.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
HI Geroge,
Thanks for the input. Appreciate some more info wrt TCAM usuage if possible.
Another thought, I agree ip schema is individual preference, but I want to
know the best practise (vague term best practice). Personally even I am in
favor of /64 p-t-p.
Regards,
Vikas
On Wed, Feb 9, 2011 at 12:11 PM, George Bonser <gbonser@seven.com> wrote:
> > I am looking for the recommendation for core interfaces IP addressing
> > schema
> > for Ipv6. Some different views are (PE- P - PE, point to point link)
> as
> > below -
> >
> > 1- Use Public Ipv6 with /122 and do not advertise to Internet
> > 2- Use Public Ipv6 with /127 and do not advertise to Internet
> > 3- Use Unique local ipv6 address
> > 4- Use Public Ipv6 with /64
> >
> > Also I am interested to understand the impact on TCAM ...
> >
> > Regards,
> > Vikas
>
> I would use a /64 with ND turned off and static neighbors configured.
> TCAM impact will depend on vendor. Some vendors give you the option of
> storing the first 64 bits of a V6 IP or the entire address. Using a /64
> means your CAM usage might be less depending on your vendor.
>
> If the addresses on the point-to-point links never accept or source
> direct traffic to/from outside your net, you can use whatever you want
> on them. ULA might be ok there. I am using public IPs but I filter
> traffic destined for them at the edge but to each their own choice. But
> if you use ULA you aren't going to be able to ping anything outside your
> net if you source the pings from the ULA interface. Just something to
> keep in mind.
>
> What you are asking is a matter of individual preference.
>
>
