How to run a cable internet on 877W router, please help.

Unanswered Question
May 22nd, 2014
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Hello everyone!


I have made many variants of IOS configuration but nothing seem to work yet and finally I need someone to tell me if this is possible at all.

I was using 877W when I was registered to my ISP as a DSL user, everything was perfect. Now I'm using a cable internet and I just can't believe this device can't handle it. I'm trying to get it done for months with one result - network loop (I guess). Don't want to give up.

Situation is as following:

Because 877W doesn't have a routable port, I'm using a VLAN and a Bridge interface to assign an IP address from ISP.

ISP -> FE0 switchport -> VLAN 1 - BVI 1 (BVI with mac address set so ISP will give it IP from their DHCP)


interface FastEthernet0

interface Vlan1
 no ip address
 no ip redirects
 ip virtual-reassembly
 no autostate
 bridge-group 1

interface BVI1
 mac-address ####.####.####
 ip address dhcp
 ip nat outside
 ip virtual-reassembly


By this configuration, internet works for for a while, then it drops and I have to restart BVI 1 interface to bring internet back again.

If I add this command in main config:

no spanning-tree vlan 1

Internet will never drop but it will became very slow, from say 35Mbps to 1-5mbps.


I think that I need somehow to force my ISP switch to "think" that my FE0 switchport is not a switchport but a single host.


Guys, I need your help!

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