Re: Ethernet Bundle - 2 ISP Link

manuadoor · ‎03-02-2010

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..

Thanks,

Manu

ajaykumar2k1 · ‎03-03-2010

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.

Regards

Ajay Kumar

manuadoor · ‎03-03-2010

Its used for layer 3 Connectivity...

ajaykumar2k1 · ‎03-03-2010

Manu

Following is the link configuring Layer 2 / Layer 3 etherchannels

http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.1E/native/configuration/guide/channel.pdf

Regards

Ajay Kumar

manuadoor · ‎03-03-2010

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

Tharak Abraham · ‎03-03-2010

Manu,

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.

HTH,

Tharak

manuadoor · ‎03-03-2010

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)

firewall1----->loadbalancer1------->router1---------->ISP1

firewall2----->loadbalancer2------->router2---------->ISP2

in this ISP already given a 4Mb link..

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

Tharak Abraham · ‎03-03-2010

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.

Roopak Sethi · ‎03-03-2010

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.