This is change taken as part of the HLD: sonic-net/SONiC#1470 and this is a follow up on the PR #16827 where in the docker-dhcp we pick the value of primary gateway of the interface from the VLAN_Interface table which has "secondary" flag set in the config_db
Microsoft ADO (number only): 16784946
How did I do it
- Changes in the j2 file to add a new "-pg" parameter in the dhcpv4-relay.agents.j2, the ip would be retrieved from the config db's vlan_interface table such that the interface which are picked will have secondary field set.
- Changes in isc-dhcp to re-order the addresses of the discovered interface and which has the ip which has the passed parameter.
Why I did it
Currently SONiC use the 'isc-dhcp-relay' package to allow DHCP relay functionality on IPv4 networks only.
This will allow the IPv6 functionality along the IPv4 type.
How I did it
Edit supervisord template to start DHCPv6 instances when configured to do so on Config DB.
Align cfg unit test to the new change.
Add DHCPv6 relay minigraph parsing support and a suitable t0 topology xml file for UT.
How to verify it
Configure DHCPv6 agents as described on the feature HLD: Azure/SONiC#765
Test it with real client/server with IPv6 or use the dedicated automatic test: Azure/sonic-mgmt#3565
Signed-off-by: Shlomi Bitton <shlomibi@nvidia.com>
* Split docker-dhcp-relay.supervisord.conf.j2 template into several files for easier code maintenance
