MEC is not possible.
Routing/Routed mode is not possible.
FW1 is in transparent mode - forwarding L2 frames.
How does spanning tree play in this scenario?
It seems to me that SW3 will receive two BPDUs on the same portchannel interface:
- A. Original BPDU from SW1 which is fine
- B. Higher cost BPDU forwarded by SW2 which can make the port turn into blocking?
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