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I'm replacing two 2901 routers with newer 4331 routers both running IOS-XE 17.12.07b. The two routers are at two different sites with two different internet service providers. On both routers, I have the "ip address dhcp" on my WAN interface, ...
The config that I have on the two 4331 routers is the same as the config I had on the older 2901 routers. Since those routers worked without any PPP configuration or dot1q sub-interfaces (and still work), I tend to discount those as possible reasons...
