I've been asked many times by my friends How to configure Cisco router for Be Unlimited broadband?

I use Be with my Cisco 877 router and it works extremely well. It solved me a lot of hassle which I had before when using less advanced vendors.

I decided to write this short guide, especially because Be uses quite rare setup in UK.

Firsts of all, Be Broadband uses RFC1483 Bridge mode instead of PPPoA ( the most widespread).

In addition, they use pvc 0/101 instead of standard 0/38.

I will try to show you how to setup your Cisco router in order to work with your Be dsl line.

You need to enable Integrated Routing and Bridging (IRB) on your router.

In order to do it type the following command in global configuration mode:

bridge irb

The next step is to create your bridge by commands:

bridge 1 protocol ieee
bridge 1 route ip

and configure it with ip

interface BVI1
description my local range
ip address 192.168.24.1 255.255.255.0 <-- you can change that range to your preferences
ip nat inside
ip virtual-reassembly
!

you will need to link all your local interfaces with that bridge

interface Vlan1
no ip address
bridge-group 1
!

if you have wireless interface you will need to include the following in your SSID section

bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 spanning-disabled
bridge-group 1 block-unknown-source
no bridge-group 1 source-learning
no bridge-group 1 unicast-flooding

Now, we need to configure your dsl interface.

From global configuration mode run the following:

!
interface ATM0
no ip address
no ip redirects
no ip unreachables
no ip proxy-arp
no atm ilmi-keepalive
dsl operating-mode adsl2+
no shut
!
interface ATM0.1 point-to-point
description Link to Be Unlimited
ip address 87.194.X.X 255.255.252.0 <----- put your ip address and mask
ip pim sparse-dense-mode
ip nat outside
ip virtual-reassembly
no snmp trap link-status
atm route-bridged ip
pvc 0/101
encapsulation aal5snap
!
!

We need to configure routing and NAT as a next step.

create access-list

access-list 1 permit 192.168.24.0 0.0.0.255 <-- if you changed your local range previously you will need to modify this part

ip nat inside source list 1 interface ATM0.1 overload

setup your default route:

ip route 0.0.0.0 0.0.0.0 87.194.220.1 <--- modify that ip matching details provided by Be

You should have your internet working.

You may need to configure dhcp server but this topic is really well covered at cisco.com and other sources on internet.

Have fun!

Sebastian Brzegowy