Dear guys:
I have an ovs working as both L2 switch and L3 router, L2 switch is a
typical learning switch(using "normal" flow entry) and works fine.
To L3 router function, things become difficult. In my setting, each port on
ovs is access port, when I route one packet from one port to
another port with a difference access vlan tag, I have to modify the vlan
tag to that of the destination port, then use NORMAL action to
forwarding the packet to the destination port.
________________
| |
| OVS |
| |
----2----------1----------
| |
| |
VM2 VM1
Showing in the diagram above, VM2 has a access vlan of 20, VM1 has a
access vlan of 10. The flow entry looks like this:
In_port=1, dl_dst=gateway_mac, nw_dst=VM2_IP,
actions=mod_dl_dst:VM2_MAC, mod_vlan_vid:20, output:NORMAL
To my surprise, the packets from VM1 to VM2 were dropped, Log of ovs said I
can't modify vlan id of an access port.
By changing VM1 and VM2's port type to "NATIVE-UNTAGGED", I can solve this
problem, but I'm unsure of the different between access port and native-untagged
port, are their behavior exactly the same? Can I replace a access port with
a native-untagged port?
The mail is a bit long and the problem somewhat complicated, thank you for
your patience!
Yours
Frank
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