load balancing and redundancy with 2 different ISPs

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daniel.nocito Thu, 12/10/2009 - 06:39
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Can you describe what you are trying to accomplish?  inbound or outbound lb / reduncancy, single site or multiple, etc?

paolo bevilacqua Thu, 12/10/2009 - 09:33
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1) BGP, public AS, and PI addresses.


2) see (1)

paolo bevilacqua Thu, 12/10/2009 - 09:52
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search " bgp multihoming".

it cannot be done with static route.


Since all this is complicated and expensive, most people just use NAT load balancing.

Rick Morris Mon, 12/14/2009 - 13:41
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you need to have your own IP space and AS number.  This is clean, and provides you the control over the announcement of your traffic.  Run BGP with ISP's,  would also investigate Pfr as an option.

Rick Morris Tue, 12/15/2009 - 07:22
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1.  Cannot use private AS if you want to control upstream traffic via the peers.  The only way to accomplish this is via public AS.

2.  As already indicated you cannot use static routing to accomplish this with 2 different ISP's.  If you used the same ISP and had the same POP you could run equal weight static routes and get what you are looking for, but that is not what you asked.

3.  GLBP is used before the edge, not on the edge.  GLBP is much like HSRP or VRRP in which routing is sent to the edge via specified criteria.  GLBP provides gateway load balancing.

sachinraja Tue, 12/15/2009 - 11:35
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Hi Alsayed


Please find a document attached with configuration examples.. am sure this doc will help you..


as other posters said, it is easy to do this with public AS's and by getting IP addresses from APNIC... with private AS it becomes really tough, as you will have to depend more on your upstream BGP peers for translating your BGP numbers ! anyways the document explains all scenarios you need.


Hope this helps.. all the best..


Raj

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