change the default of calico_network_backend to bird

[weizhoublue]

Signed-off-by: [email protected] [email protected]

What type of PR is this? /kind bug

What this PR does / why we need it: fix communication issue when enable ipv6 vxlan of calico CNI

Which issue(s) this PR fixes: According to my test, when set calico_network_backend to be vxlan and enable dual-stack IP family, each node does not take effect the block route for pods of other nodes, so it fails to communicate the IPv6 address of pod on other nodes

if calico_network_backend set to be bird, seems every tunnel case works fine, including ipip and vxlan for IPv4 and IPv6

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fails to communicate IPv6 address of pod  when enable calico ipv6 vxlan  

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @weizhoublue. Thanks for your PR.

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[floryut]

@cristicalin isn't vxlan the recommanded configuration by calico team as stated in https://github.com/kubernetes-sigs/kubespray/pull/8434 ?

[weizhoublue]

https://github.com/kubernetes-sigs/kubespray/pull/8434 mentioned to use vxlan tunnel, exactly, vxlan tunnel is actually a better configuration for most network environment, and my PR still keep vxlan tunnel "calico_vxlan_mode: Always".

I will test again and double-check , close the PR firstly