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Maniphest T358868

Use BGP to announce VM ranges from cloudnet to cloudgw
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Description

Replace the current static routes from cloudgw towards cloudnet with BGP to advertise those routes.

Relevant Neutron documentation:

Seems like this was tried in early 2020: T245606: CloudVPS: enable BGP in the neutron transport network. A summary of that can be seen at https://wikitech.wikimedia.org/wiki/Wikimedia_Cloud_Services_team/EnhancementProposals/Network_refresh#BGP_in_the_transport_network.

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Event Timeline

taavi created this task.Mar 1 2024, 2:20 PM
taavi updated the task description. (Show Details)Mar 1 2024, 2:28 PM
taavi updated the task description. (Show Details)Mar 1 2024, 2:30 PM
aborrero added a comment.Mar 1 2024, 4:11 PM

What we did not try in 2020 was to run bird directly on the box via puppet, without openstack, to learn about upstream routes (to cloudgw).

aborrero moved this task from Backlog to Radar on the User-aborrero board.Mar 1 2024, 4:12 PM
taavi edited parent tasks, added: T364725: Migrate Cloud VPS instances to VXLAN based networks; removed: T358761: Deploy OVS test setup in codfw1dev.Mon, May 13, 10:22 AM
taavi mentioned this in T245606: CloudVPS: enable BGP in the neutron transport network.
cmooney added a comment.Mon, May 13, 4:50 PM

Happy to discuss. I think if we are doing this it makes sense to do the cloudgw <-> cloudsw BGP at the same time (we will need to create the Bird config for the cloudgw to talk to cloudnet, so while we are doing so let's do the other side too).

In T358868#9591066, @aborrero wrote:

What we did not try in 2020 was to run bird directly on the box via puppet, without openstack, to learn about upstream routes (to cloudgw).

Is that the plan here? The docs in the task suggest using the internal ovn-bgp-agent?

Is it the case that if we use the ovn-bgp-agent it only announces routes, but isn't capable of learning a default route announced by the cloudgw's?

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