Subject: [bess] Comments on the ND refresh message in draft-ietf-bess-evpn-proxy-arp-nd-08

From: <[email-masked]>
Date: Mon, 26 Aug 2019 10:43:21 +0800 (CST)

Hi Jorge,

The ND refresh message is assumed to be a NS message with its Sender's IP = Link Local Address in section 4.4 of draft-ietf-bess-evpn-proxy-arp-nd-08.

<snip>

      An ARP refresh issued by the PE will be an ARP-Request message           

      with the Sender's IP = 0 sent from the PE's MAC SA. If the PE has

      an IP address in the subnet, for instance on an IRB interface,

      then it MAY use it as a source for the ARP request (instead of           

      Sender's IP = 0). An ND refresh will be a NS message issued from

      the PE's MAC SA and a Link Local Address associated to the PE's

      MAC.

</snip>

But I think there may be no Link Local Address when the bridge domain is not assigned with an IRB interface.

Will the Link Local Address of ND refresh message be used in the reply message?

Otherwise it is just an IPv6 address with the Link Local Address format, but it won't function as a real Link Local Address? 

Why not we use the 0:0:0:0:0:0 ?  

Best Regards,

Bob