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Following on from Yong's suggestion about flow control rules I checked the rules on br-int and br-eth0 on both nodes. The example below is from br-int on the controller and port 20 was set to drop by default. This was the same for br-int on the other node, and for br-eth0 on both nodes.

sudo ovs-ofctl show br-int OFPT_FEATURES_REPLY (xid=0x1): ver:0x1, dpid:00005aa5a97a1541 n_tables:255, n_buffers:256 features: capabilities:0xc7, actions:0xfff 2(tap55d1e5e8-ab): addr:0b:02:00:00:00:00 config: PORT_DOWN state: LINK_DOWN 18(tape8d6e0a5-52): addr:b6:a6:52:18:de:00 config: 0 state: 0 current: 10MB-FD COPPER 19(tap6176588e-48): addr:7e:b5:44:0c:fa:0d config: 0 state: 0 current: 10MB-FD COPPER 20(int-br-eth0): addr:6a:36:6c:2e:3a:76 config: 0 state: 0 current: 10GB-FD COPPER

$sudo ovs-ofctl dump-flows br-int NXST_FLOW reply (xid=0x4): cookie=0x0, duration=75826.521s, table=0, n_packets=810503, n_bytes=104709261, priority=2,in_port=20 actions=drop cookie=0x0, duration=75826.959s, table=0, n_packets=50413, n_bytes=9135002, priority=1 actions=NORMAL

Once I opened these up for both br-int and br-eth0 on both sides I could ping instances from either side so this is now working.

Is there any reason why these ports would be set to drop by default?

Thanks Eoghan