On Tue, 14 May 2019 22:27:09 -0400 Brandon Martin <lists.nanog@monmotha.net> wrote:
Is there a standard that defines/recommends behavior for route injection of snooped DHCPv6-PD (or IA, I guess) assignments on routers running relay agents? That is, snooping or otherwise examining a relayed DHCPv6 response for a delegated prefix (or IA, if you want) and installing a quasi-static route toward the relevant next-hop based on the lifetime of the delegation. Typical redistribution can then be used to put it in IGP if you want.
It seems to be a common feature - Cisco ("Relay Agent Notification" on IOS-XE), Juniper ("DHCPv6-PD Route injection" on JunOS), and Arista ("ipv6 dhcp relay install routes" on EOS), and Ruckus ("Relay Agent Prefix Delegation Notification" on FastIron) all seem to support it.
Google has, however, failed me at finding any standard that defines or recommends corresponding behavior. RFC 8415 punts on the issue:
I went through that same search a little over a year ago. I'm curious if you got any off-list replies of interest. We use dhcpv6 relay on Juniper ACX5048 (should be same on MX series). It did not work out of the box for me; Juniper had to fix a fundamental way it worked in order to work with some clients (pretty much anything Broadcom based at least). I'm running working code now (17.4R2.4). I was very pleased Juniper took the problem so seriously and fixed it... That hasn't been my experience with every vendor. I can provide some info about how it works and what "working" looks like if you are curious. Getting native dual-stack fully working has been a long, strange road as a small ISP. I'm thinking about writing something up about my experience so far. --TimH