I was curious how MTU worked with a L2TPv3 over an IPsec VTI. If I put the ip MTU command on the tunnel interface, it is unable to send a fragmentation needed message to the host for PMTU discovery because there’s no route to the host in a pseudowire/xconnect configuration. And even if it could, it would not be the correct MTU size because it would take into account the L2TPv3 encapsulation. What am I missing here? Is it possible to set the mtu in the pseudowire class?
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