routing on cisco 871

[TomF]

Hi,

I am experimenting with a Cisco 871 router. The router has 4 LAN ports and 1WAN port.
What are the limitations wrt to the LAN ports when it comes to routing. Is the WAN port the only port that supports routing?

Regards,
Tom

[Karsten Iwen · Accepted solution]

Based on your image you can configure a different amount of VLANs on the 871 (up to 4 if I remember right). These can also be included into your routing-setup.

-- 
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni

[TomF]

Hi,

Thanks for the feedback. Does this mean that I can run routing protocols like RIP on the LAN ports if I configure multiple VLANs say one per port?
I like to create a setup consisting of a Cisco 871 and a Cisco 878. The latter has no ethernet WAN port (WAN interface is a DSL interface).
I have the advanced ip software.

Regards,
Tom

[Karsten Iwen · Accepted solution]

Yes, you can run routing on the VLANs in your setup.

-- 
Don't stop after you've improved your network! Improve the world by lending money to the working poor:
http://www.kiva.org/invitedby/karsteni

[Emmanuel Valdez · Accepted solution]

Hi,

The Cisco 871 works with SVI because it only has one layer 3 port, so you can use routing over the SVI and not over the LAN ports because they only work for layer 2 connectivity.

If it is useful please rate.

Best regards.

[TomF]

Thanks for the help.

I managed to get the setup working.

Besides the VLAN / SVI setup I found two additional problems.
I forgot to setup the ports that connect the two routers as "trunk" ports (switchport mode trunk , switchport trunk encapsulation dot1q, etc.).

Furthermore I found that using multiple NICs in one (windows) machine leads to problems. When I try to ping the request is sent out to the wrong gateway (different gateway per NIC does not work).

Regards,
Tom