Junos
Junos

IPv6 Link Local Address Generation

02.09.11   |  
‎02-09-2011 02:20 PM

  My understanding with the generation of link local IPv6 addresses, is that the MAC is used, with FFFE added to pad it out to 64 bits (with some other things happening), and I see this in some juniper documentation, however on a j6350 router I don't see this happening, I see 0075 and 01f5 added in, which seems random.  What is the process at play?

2 REPLIES
Junos

Re: IPv6 Link Local Address Generation

02.09.11   |  
‎02-09-2011 07:13 PM

are you using a vlan tag on an ethernet interface?

Junos

Re: IPv6 Link Local Address Generation

02.10.11   |  
‎02-10-2011 08:31 AM

Yes, they are vlan tagged subinterfaces on a gig ethernet port.  I just did the calculation, and indeed the vlan id associated with the subinterface is what is used for the two bytes that are inserted into to make the EUI-64.  Thanks for the info.