Load sharing 2 x ADSL (WIC 1ADSL) on a C2811

[f2b]

Hi all

Can anybody help with bundling 2 x WIC 1ADSL cards on our Cisco 2811 router. I have got it working using 1 of the cards and unfortunately it is live now. So cannot test as much.

When I plug in a 2nd ADSL line into the 2nd WIC 1ADSL card, we loose network connectioins.

I know my config is not quite correct.

Thanks
Andre

 

[1fb]

What exactly are you trying to accomplish? Are you trying to bundle the ASDL cards to increase your bandwidth to your ISP? Can you post your current configuration as well?

Joe

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Cisco Discussion Forums

 

[f2b]

Hi

We have 2 x 8 Meg ADSL links that I am trying to bundle together to increase bandwidth also if one goes down the other still carries on.
This config I know is worng, but it works with 1 adsl. When I plug in the 2nd connectivity islost.



Config below with IP addresses partially removed.

Thanks
Andre

Ps. Iknow the Dialers are not needed.

version 12.3
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname Cisco2811
!
boot-start-marker
boot-end-marker
!
enable secret 5.
!
no network-clock-participate aim 0
no network-clock-participate aim 1
no aaa new-model
ip subnet-zero
!
!
ip cef
!
!
no ip domain lookup
vpdn enable
!
vpdn-group pp0a
!
vpdn-group ppoa
!
no ftp-server write-enable
!
interface FastEthernet0/0
ip address 192.168.47.1 255.255.255.0
ip nat inside
duplex auto
speed auto
!
interface FastEthernet0/1
no ip addres
shutdown
duplex auto
speed auto
!
interface ATM0/0/0
no ip address
no atm ilmi-keepalive
bundle-enable
dsl operating-mode auto
!
interface ATM0/0/0.1 point-to-point
ip address 80.xx.xx.xx 255.255.255.0
ip nat outside
pvc 8/32
!
!
interface ATM0/1/0
no ip address
no atm ilmi-keepalive
bundle-enable
dsl operating-mode auto
!
interface ATM0/1/0.1 point-to-point
ip address 213.xx.xx.xx 255.255.255.192
ip nat outside
pvc 8/32
!
!
interface ATM0/2/0
no ip address
shutdown
no atm ilmi-keepalive
dsl operating-mode auto
!
interface ATM0/2/0.1 point-to-point
ip nat outside
shutdown
pvc 8/32
!
!
interface ATM0/3/0
no ip address
shutdown
no atm ilmi-keepalive
dsl operating-mode auto
!
interface Dialer0
no ip address
encapsulation ppp
dialer pool 1
!
interface Dialer1
no ip address
encapsulation ppp
dialer pool 1
!
interface Dialer2
no ip address
encapsulation ppp
shutdown
dialer pool 1
!
interface Dialer3
no ip address
shutdown
!
ip classless
ip route 0.0.0.0 0.0.0.0 ATM0/0/0.1
ip route 0.0.0.0 0.0.0.0 ATM0/1/0.1
!
ip http server
no ip http secure-server
ip nat inside source list 1 interface ATM0/0/0.1 overload
!
!
access-list 1 permit 192.168.47.0 0.0.0.255
!
!
!
control-plane
!
line con 0
password
login
line aux 0
line vty 0 4
password
login
!
scheduler allocate 20000 1000
!
end

 

[1fb]

I dont think you can "bundle" these connections together. I think the best your would be able to do is load balance/ failover between the two connections.

 

[f2b]

Thanks. On more investigation I have foun that I have to Multilink to 1 ip address and my ISP has to do some work at their end. Not sure as yet what they need to do, I only hope they know....probably too much to ask!

I have a good idea what the config at my end needs to look like but not at the ISP end.

Does anyone have any ideas?

Thanks
Andre

 

[KiscoKid]

Hi F2b

Bundling DSL links together is not a walk in the park for the ISP. A lot of ISP's only subscribe to BT's IP Stream product (this is the one where contention ratios are always fixed, i.e. 20:1 or 50:1). With this option, BT supply all the required DSL infrastructure.

BT also offer Data Stream which effectively means the ISP can now have a presence on BT's DSL network and can do additional things not included in BT's IP Stream product. One of these things is it gives them the ability to enable ppp multilinking which allows ISP's to bundle multiple DSL connections together for their customers.

So, that said, I would call your ISP and ask them if they support ppp multilinking and whether they provide/can provide a data stream connection from your PoP. If they can, you're in business.

If they do not, then I can tell you BT officially do not support the use of ppp multilink over their DSL network.

I hope this is clear. Let me know and I'll be happy yo clarify anything.

 

[f2b]

Interesting. I am based in Marbella, Spain. Our ISP is Telefonica, which is owned by guess who....BT!
I will call them. Will let you know the outcome.

Thanks for your input.

Andre

 

[KiscoKid]

By the way, here is a config for a router for use with ppp multilink over ADSL. This assumes your ISP can support PPP multilink of course:


interface ATM0
no ip address
no atm ilmi-keepalive
pvc 8/32
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode auto
!
interface ATM1
no ip address
no atm ilmi-keepalive
pvc 8/32
encapsulation aal5mux ppp dialer
dialer pool-member 1
!
dsl operating-mode auto
!
interface Dialer0
ip address negotiated
encapsulation ppp
dialer pool 1
dialer-group 1
ppp authentication chap callin
ppp chap hostname xxxx
ppp chap password xxxx
ppp multilink
!
ip classless
ip route 0.0.0.0 0.0.0.0 Dialer0
!
dialer-list 1 protocol ip permit
!
end

 

[f2b]

From what I now understand. My ISP needs to set up the 2
ADSL links with ppp Multilink going to 1 IP address.

I noticed you're not using ATM sub-interfaces? If my ISP does support ppp multilink then am I right in thinking that the single IP address needs to go on the dialer interface?

Thanks
Andre

 

[KiscoKid]

Yes, all I've done is create a PVC for each DSL connection on the main interface. And yes, the IP address to connect to your ISP is allocated to the dialer interface.

I see your're using NAT. You can deploy that as follows:

interface Dialer0
ip nat outside
int f0/0
ip nat inside

ip nat inside source list 1 interface dialer0 overload

access-list 1 permit 192.168.47.0 0.0.0.255

 

[f2b]

That's great. Thank you for your time.
Andre