The problem wasn't with OSPF—it was with the port settings.
Sigh.
I keep forgetting that on Cisco routers, interfaces named “Ethernet
” are only 10Mbps, while “FastEthernet
” are 100Mbps. Also, 10Mbps interfaces are not full duplex, but half duplex.
Now that I've made those changes, the problem seems to have gone away.
I have to remember: Ethernet
are 10Mbps, FastEthernet
are 100Mbps.
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