Ethernet Bundle - 2 ISP Link

Unanswered Question
Mar 2nd, 2010

Hi All,

I have two 2Mb line from a single ISP which is provided in ethernet. Is there any way to use it as a 4Mb Sngle link..



I have this problem too.
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ajaykumar2k1 Wed, 03/03/2010 - 00:09

Hi Manu

Need some more information .

Are you running any routing protocol over these link or not .I mean to say you are  using these links  as layer 2 or layer 3 connectivity.

Accordingly we can configure these link in layer 2 or layer 3 etherchannels.


Ajay Kumar

manuadoor Wed, 03/03/2010 - 00:21

One quick Qn.. Ether Channel should be configured both the ends right?? But No access to ISP side!!

Tharak Abraham Wed, 03/03/2010 - 00:24


Will the ISP allow aggregation at their end ?

If yes, go for LACP ! This can be done at L2 or L3

If you run some IGP like Ospf, it can do the load balancing at Layer 3

If its all Cisco network, you can even exploit the CEF with per-destination/per-packet load balancing without trying for any aggregation too.



manuadoor Wed, 03/03/2010 - 00:33

1. ISP not allowing to create etherchannel at their end.. (here its atleast one ISP, if it is two ISP.. we cant even think of this)

2. So far no routing protocol is used, all default routes..

3. Our ultimate aim is to have 4Mb bandwidth (there is another loadbalancer sitting behind this router)



in this ISP already given a 4Mb link..

unfortunately the second ISP gave 2 *2Mb link..

Tharak Abraham Wed, 03/03/2010 - 00:51

Well we can rule out link aggregation over here in this case.

The only option is loadbalance at Layer 3.

I dont know exaclty how the performance will differ, but not too much.

Roopaksethi2005 Wed, 03/03/2010 - 09:23

I think you should ask your ISP to provide single 4 MB ethernet line instead of two 2 MBs. This will be beneficial for you. Otherwise, In my views, only load balancing is possible.


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