[j-nsp] Junos and single IPv6 link-local address per IFL

Anderson, Charles R cra at wpi.edu
Thu Jan 24 17:12:45 EST 2019

On Fri, Jan 25, 2019 at 12:02:55AM +0200, Martin T wrote:
> Hi Charles,
> > Link-Local addresses should be in fe80::/64, not fe80::/10.
> As Eldon already mentioned, then I actually used /64 prefix in my
> examples. However, any address from address block fe80::/10 should be
> fine. The point is, that for some reason, Junos allows to have only
> one link-local address per IFL.

Yes, I see that Junos only allows one link-local.  But I stand by my comment--you should not be creating link locals outside of fe80:0000:0000:0000::/64.  

> root at vmx1# show | compare
> [edit interfaces ge-0/0/9 unit 0 family inet6]
>         address fe80::206:aff:fe0e:fffa/64 { ... }
> +       address fe80:1::206:aff:fe0e:fffa/64;

fe80:0001:0000:0000::/64 is not valid as a link-local address and I've run into vendors that have issues with such addresses.  See RFC 4291 Section 2.5.6.

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