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

[Martin T]

Hi,

looks like Junos allows to have only a single IPv6 link-local address.
For example, here I tested with Junos 18.2R1.9:

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;

[edit]
root at vmx1# commit check
[edit interfaces ge-0/0/9 unit 0 family inet6]
  'address fe80:1::206:aff:fe0e:fffa/64'
     Link Local address exists
error: configuration check-out failed

[edit]
root at vmx1#

..or:

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

[edit]
root at vmx1# commit check
[edit interfaces ge-0/0/9 unit 0 family inet6]
  'address fe80::206:aff:fe0e:fffb/64'
     Link Local address exists
error: configuration check-out failed

[edit]
root at vmx1#

Just out of curiosity, why there is this limitation? For example
FreeBSD 11, which Junos 18.2R1.9 is based on, does not have this
limitation:

root at FreeBSD-11:~ # ifconfig em0 inet6
em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu
1500
        options=209b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC>
        inet6 fe80::fc69:d3ff:feec:7741%em0 prefixlen 64 scopeid 0x1
        inet6 fe80::fc69:d3ff:feec:7740%em0 prefixlen 64 scopeid 0x1
        nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
root at FreeBSD-11:~ #


thanks,
Martin