01-19-2007 01:54 AM - edited 03-03-2019 03:25 PM
Hi, I have 3750 on each end of my location .
i have 2 wan link on ethernet one is of 45 Mb and other is of 20 Mb both from diff ISP.
Please suggest me the configuration i shoud go ahead to achive load balance and redundency on wan links.
by business requires continus connectivity this connectivity should not loose any session.
Please help me achive this.
01-19-2007 02:08 AM
Hi Prasad,
Are you running any routing protocol between these two sites.
As both the WAN links are dedicated ones, the redundancy part will be taken care by the routing protocol.
As the links are unequal in bandwidth, if you are running EIGRP as your IGP, then you have the option to do unequal cost load balancing.
Revert back to us if you need more clarification.
-VJ
01-19-2007 03:43 AM
Hi VJ,
Thanks for u r reply.
will eigrp help me in maintaining existing session.
can you give me sample configuration.
Thanks.
01-19-2007 03:51 AM
Prasad,
I believe these coonects are private conections between the 2 sites.
EIGRP will work in your case.Please look at the EIGRP design guide below and should help you incase.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009437d.shtml
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094cb7.shtml
HTH,
-amit singh
01-19-2007 03:53 AM
Hi,
Yes. With EIGRP, you can do unequal cost load balancing.
Have a look at this URL for a theoretical background on the same.
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a008009437d.shtml
Hope this helps. Kindly rate the post, if it was helpful.
-VJ
01-19-2007 03:56 AM
Dear
Load balance between tow providers easy but how about your address scenario, are you have your own IP address (PI)? or you NAT your private with by the providers pools?
Best Regards,
Mounir Mohamed
01-21-2007 08:14 PM
It is purely L-2 ( Ethernet )connectivity from both of my ISP's.
Can i use Etherchannel Bundulling for unequal BW Link .
Thaks,
Prasad Patkar.
01-22-2007 05:17 AM
Prasad,
If your port configurations are exactly same i.e the trunk configurations,Speed,Duplex etc. then it should work for you. Practically I havent tried but it should work for you keeping in mind that ISP's has allowed PAgp or LACP control traffic end-end.
-amit singh
01-23-2007 01:51 AM
Hi,
If you use ospf routing protocol between two sites, you can have redundancy and load balancing but max through put will be 20+20 = 40 mbps only (less than 45 mpbs!). If you have any idea about traffic pattern, you can statically route few segments separately.
Thanks
Karunakar
NIC
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