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Cisco 871 Routers

Cisco 871 Routers

Cisco 871 Routers

Hi Guys,

This series of routers has a built in switch. I understand that to enable routing the switch ports must become part of a configured vlan on fe0,fe1,fe2 and fe3. Fe4 does not have a layer 2 port and is layer 3 only. On the device fe4 is clearly labelled 'WAN'. My question is, to enable routing from the LAN out to the WAN, must I create a virtual connection from the vlan to fe4? Would this involve configuring the dot1q protocol on fe4 or possibly a trunking command? If this were a seperate physical router and switch, all I would need to do is plug the switch in to the router with a physical cable. I guess I need to work out how to do this virtually.

Thanks :)

RE: Cisco 871 Routers

Fe4 is a port in the router - so no VLANs or dot1q config unless you configure subinterfaces.
Fe0-3 are ports in the switch, so they can be Access ports or Trunks ports carrying one or more VLANs.

Configure an IP address on Fe4 and enable it.
Configure a VLAN interface with an IP address and enable it.

Now do a show ip route. This should answer your question.

RE: Cisco 871 Routers

Thanks Vince for clearing that up for me. What you said makes a lot more sense.

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