Comment 1 for bug 1404945

I am experiencing the same problem. I have found out that whenever I add the default route first, and the subnet port to the router after that, the default route disappears.

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When using VRRP routers with multiple network nodes, when adding gateway before adding a port to subnet, the default route disappears.

router-gateway-set 707049a1-037f-4db3-8df9-6cf0d4c9d786 f7a48a9c-651d-4dcd-9168-712697b0911d

Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 10.0.0.1 0.0.0.0 UG 0 0 0 qg-d72a993b-cd
10.0.0.0 0.0.0.0 255.255.255.0 U 0 0 0 qg-d72a993b-cd
169.254.192.0 0.0.0.0 255.255.192.0 U 0 0 0 ha-f613be73-c5

At this point, everything is ok.

When adding the interface to subnet

router-interface-add ha_router 020f3181-ac94-4ebe-baeb-8aac27ab691d

Destination Gateway Genmask Flags Metric Ref Use Iface
10.0.0.0 0.0.0.0 255.255.255.224 U 0 0 0 qg-d72a993b-cd
169.254.192.0 0.0.0.0 255.255.192.0 U 0 0 0 ha-f613be73-c5
192.168.100.0 0.0.0.0 255.255.255.0 U 0 0 0 qr-724eb301-69

The default route has disappeared and external connectivity is broken.