[Expired for neutron because there has been no activity for 60 days.]
** Changed in: neutron
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1609296
Title:
BGP: multiple AZ neutron env has no routes to gateway IPs
Status in neutron:
Expired
Bug description:
The neutron DR agent only advertise floating IP routes as
destination(floating IP/32) - next_hop(gateway IP).
Such routes may cause link unreachable in a layer 3 isolated multi-AZ network
environment.
For instances:
ISP1 - DC1
ISP2 - DC2
ISP3 - DC3
For the floating IPs, we let all the ISP to advise the IP range, such as
172.16.1.0/24.
And each DC is layer 3 isolated in a separate AZ managed by one neutron
deployment.
So for a floating IP (172.16.1.10) bgp route will be:
+-----------------+--------------+
| destination | next_hop |
+-----------------+--------------+
| 172.16.1.10/32 | 172.16.1.2 |
+-----------------+--------------+
We use more than one DR agent to advise that route to all DC physic device
(router).
Then assuming that 172.16.1.10 is served at DC1. Some incoming traffic from
DC2 or DC3 now does
not know how to route the 172.16.1.10, because the 172.16.1.2 is stranger to
them, aka link unreachable.
So advising the gateway routes may be needed in such scenario.
Example topology:
https://docs.google.com/document/d/1rlQEbD-Wr99surhKN3O29f29KSfmmplilEvb9ysFBzE/pub
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