WEBVTT

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Start with two Cisco routers connected by a single Ethernet link.

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Check the hardware model with show inventory and the software with show version.

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On the first router, label the port, configure an address, and bring it up.

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Set the IP maximum transmission unit and check the value on the interface.

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Check that the peer router replies before you change the port state.

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Shut down the local interface and check that the peer is unreachable.

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Bring the interface up again and verify that traffic recovers.

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An unsupported port is rejected and does not appear in the interface list.