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8197 Views 2 Replies Latest reply: May 26, 2009 1:28 AM by Wong Teck Wu RSS

Currently Being Moderated

Bridge mode?

May 25, 2009 7:29 PM

Wong Teck Wu 87 posts since
Aug 26, 2008

Hi guys,


Not sure if anybody can help, I'm not able to find the information on this.


Basically I have a client that needs to set a Cisco 877 DSL router to Bridge Mode.  How do I do that?  I saw some commands like bridge-group 1 etc.. but wonder what are the required settings for it to work.  I understand that setting a router to bridge mode would basically turn it into like a modem.  So the other device would just have to set the allocated LAN IPs (public IPs) for it to work right?


Below is my current config:


interface ATM0
description DSL
no ip address
atm ilmi-keepalive
dsl operating-mode itu-dmt
interface ATM0.1 point-to-point
description WAN
ip address (Point to Point IP)
ip nbar protocol-discovery
ip inspect full in
ip ips ips-128 in
atm route-bridged ip
pvc 0/33
  vbr-nrt 512 256
  encapsulation aal5snap
interface FastEthernet0
interface FastEthernet1
interface FastEthernet2
interface FastEthernet3
interface Vlan1
description Customer LAN
ip address (/24 range public IPs)
ip inspect full in
ip ips ips-128 in


default route

  • Scott Morris - CCDE/4xCCIE/2xJNCIE 8,428 posts since
    Oct 7, 2008
    Currently Being Moderated
    1. May 25, 2009 7:55 PM (in response to Wong Teck Wu)
    Re: Bridge mode?

    Like anything, it depends on the specifics we're trying to achieve.   Bridging is used in order to get non-routable protocols to talk to each other over different/separate interfaces.


    Your "bridge-group 1" will be defined someplace else as "bridge 1 protocol ieee" most likely.  Or it could be IBM protocol.  or if a switch, it could be vlan-bridge protocol.  That defines the underlying algorithms.  Without going into too much hideous detail, it's all about what you need to accomplish!  And if you have no burning need (e.g. don't know what it is) don't go beyond the default! 


    Check out


    I'm guessing you're wanting to change to bridging (between ethernet/VLAN1 interface and teh ATM VPC) in order to run PPPoE directly from the client PC instead of from the DSL configuration.





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