Bundle 2 DSL lines

[Bart Kersten]

Hi,

We have a customer that needs faster internet but it isnt availble at his location. so my idea was 2 bundle 2 ADSL lines for higher up and download speed. I am planning to use a Cisco 1941 with 2 EHWIC slots. Maybe i am totally wrong and i should use a other router? all advice is welcome.

Now my qeustion is, how do i configure this on the router? Do i do it with load balancing or should i bundle the two interfaces together somehow? I am experienced with configuring cisco routers but i have never done this. Can someone provide me with a configuration example? or a website with some good information, because i can't find one. All other advice on how to achieve this is welcome too.

Thanks in advance

Bart

[Karsten Iwen]

The 1941 should be absolutely ok with 2 DSL-lines.

You cant' do any multilink unless the provider will support that. One way to use these two lines could be Performance-Routing:

http://www.cisco.com/en/US/products/ps8787/products_ios_protocol_option_home.html

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[Bart Kersten]

Hi karsten thanks for your reply

So lets say my isp does support multilink, do i still have to use pfr? Or do i have to use pfr if they dont support multilink?

But the main qeustion is in both cases will this get me more bandwith? In this case they theoratically have 4mb/s down and 1mb/s up (adsl) if i choose to use pfr will this double? Or am i misunderstanding the theory of pfr?

Thanks

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[kcrumzahm]

Bart,

This is my config for 6xT1's using an ASR1001, the ASR1001 is overkill for 2 DSL lines. Don't use Performance-Routing sorry I can't help with that but maybe someone else can.

http://www.cisco.com/en/US/docs/wireless/asr_901/Configuration/Guide/mlppp.html

cisco ASR1001 (1RU) processor with 1194968K/6147K bytes of memory.

4 Gigabit Ethernet interfaces

6 Serial interfaces

8 Channelized T1 ports

32768K bytes of non-volatile configuration memory.

4194304K bytes of physical memory.

7618559K bytes of eUSB flash at bootflash:.

interface Multilink1

description Verizon MPLS

bandwidth 9264

ip address x.x.x.x x.x.x.x

ip flow ingress

no peer neighbor-route

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

ppp multilink fragment disable

!

!

interface Serial0/1/0:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

!

interface Serial0/1/1:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

!

interface Serial0/1/2:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

!

interface Serial0/1/3:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

!

interface Serial0/1/4:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

!

interface Serial0/1/5:0

description Verizon CircuitID:

bandwidth 1544

no ip address

encapsulation ppp

ppp chap hostname XXXXXXXX-XXXXXXX

ppp multilink

ppp multilink group 1

[Bart Kersten]

Hi kenneth thanks for your reply

So the only thing you have configured are th WAN interfaces? With this i mean, arent there any other things to configure to achieve my goal?

In your case you have 6 times more bandwith with the config you posted?

Thanks

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[paolo bevilacqua · Accepted solution]

This is often asked and easily found with a search.

You cannot configure DSL circuits as in the MLPPP example above, that has erroneously been given. That is because DSL ISP will not support MLPPP, just ask them to confirm.

The only possibility is to load balance, according to this example:

http://www.cisco.com/en/US/tech/tk648/tk361/technologies_configuration_example09186a0080950834.shtml

[Bart Kersten]

Hi paolo, thanks for your reply

Thanks for clearing things up, just for confirmation. If i configure nat load balancing my theoratical speed of 4mb/s will double to 8? I need a simple conformation so i can use this topic as a discussion point with my collegeus.

Thanks!

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[paolo bevilacqua · Accepted solution]

No.Single session speed will stay the same, and there is no thing on earth that can change that.

Aggregate traffic may peak to the sum of circuits

[Bart Kersten]

Already found an article that explains it very wel and this is infact the awnser inwas lookin for

Thanks paolo!

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[paolo bevilacqua]

Thank you for the nice rating and good luck!

[Bart Kersten]

No problem, thanks alot!

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