DHCPv6-PD relay route injection - standard?
lists.nanog at monmotha.net
Wed May 15 02:27:09 UTC 2019
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:
> the server may need a protocol or other
> out-of-band communication to configure routing information for
> delegated prefixes
It would be nice to have some sort of semi-normative behavior to at
least refer to if only to use it to prod vendors.
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