Joe and Mark,
You said "Because tunnels are links, they are subject to the same issues as any link, e.g. MTU.." The MTU issue exist between any two points in a network. The MTU issue for tunnel is more like the MTU issue between any two points in the network (i.e. traverse many links, and can change over time), less like the MTU for a single link because the single link MTU is only determined by the fixed TWO endpoints of the link, whereas the MTU of a tunnel (and a path) is impacted by many links in between, i.e. more dynamic and can change depending which path the packet traverse through. In the section 1 of your draft, you stated: ".. tunnels emulate a link". To me, "tunnel" hide the inner addresses, but the packets can traverse many links. So Tunnels hardly emulate a link. My two cents. Linda
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