RE: [nesg] RE: status update for ESnet

Mike / Ole

> Mike Collins wrote:
> The simple answer is that 128-bit prefixes are required for the
> loopback address in a Juniper router. Host address are required
> for the loopback for both IPv4 and IPv6.

Got it, thanks.


> Ole Troan wrote:
> both /64 and /128 can be aggregated. what is your point?

With regard to what Bob Fink posted quoted below:

> Interfaces addresses are globally unique and are /64s.
> Loop back addresses are globally unique /128s from a common /64.

The way I understand this is:
[I just made up these numbers, good enough for example]
Let's say you have been assigned 2001:xxxx::/32
Out of this, you reserve 2001:xxxx:FFFF:FFFE::/64 for loopbacks,
And you assign
Router 1's loopback: 2001:xxxx:FFFF:FFFE::1/128
Router 2's loopback: 2001:xxxx:FFFF:FFFE::2/128
Router 3's loopback: 2001:xxxx:FFFF:FFFE::3/128

If what is above is not correct, I find the "from a common /64" part
confusing.

If what is above is indeed correct, you have to explain me how you
aggregate these loopback addresses.

Back to your 2001:xxxx::/32, you might want to do something like:

2001:xxxx::/40 Illinois
  2001:xxxx:0001::/48 Chicago
2001:xxxx:100::/40 California
  2001:xxxx:101::/48 Berkeley
  2001:xxxx:102::/48 Livermore

Then there is no way router 1's loopback can be part of the Chicago
block, and router 2's loopback address part of the Berkeley block.

Michel.