Re: controlling outgoing traffic among dual links BGP

x2 for PfR this is a perfect use case to use it, if you have 3:1 ratio then I would set 60% tx bw on the less preferred link and leave the best link at default, even implement resolution on delay and throughput and sit back and let PfR do the intelligent work, great technology

It's quite deep to implement and prove to your boss but watch INE's vseminars and then start testing it using IOS 15x train

--
BR
Tony
Sent from my iPad
On 15 Aug 2013, at 14:43, John Haddad <loserboy3000_at_hotmail.com> wrote:
> Thanks a lot team,
> 
> 
> 
> We always reach to point to use the link controller to control the outbound
> traffic for unequal load balancing, is that hard to implement the solution
> using the routing protocol!
> 
> On many cases one of the link will be filled up and we shall have complete
> downtime on the branch.
> 
> 
> 
> 
> 
> 
> 
> From: marc abel [mailto:marcabel_at_gmail.com] 
> Sent: Thursday, August 15, 2013 4:33 PM
> To: John Haddad
> Cc: Cisco certification
> Subject: Re: controlling outgoing traffic among dual links BGP
> 
> 
> 
> You have two separate issues here. Outbound and Inbound.
> 
> 
> 
> For outbound you have a couple options. Just getting a full feed from two
> ISPs will allow you to utilize both links but doesn't really do load
> balancing. You can use PFR (OER) to do more intelligent outbound decision
> making. Another option is to use the bgp dmz-bw
> http://www.cisco.com/en/US/docs/ios/iproute_bgp/configuration/guide/irg_link
> _band.pdf
> 
> 
> 
> Inbound you run into different problems. If you have equal cost links to 1
> ISP you can possibly get them to load balance, but if different ISPs you are
> stuck. You can subnet your IP range and advertise different prefixes to your
> providers and then try to manually balance your traffic by assigning public
> IPs to different ISPs. For example your main NAT address come in through
> provider A, but your webservers come in through provider B. Keep in mind
> most ISPs wont accept anything less than /24. You would use AS path
> prepending to make the secondary link less preferred for each traffic class.
> There is also some things you can do with PFR (OER) inbound now where it
> automatically samples traffic and does dynamic as path prepending, but I
> have not personally used this.
> 
> 
> 
> One of my biggest disappointments in studying for the CCDP was that none of
> this was discussed in any of the literature I read. Seems to be one of the
> most common design questions I run across and Cisco didn't cover it at all
> in their professional level design test.
> 
> 
> 
> Hope that helps,
> 
> 
> 
> Marc
> 
> 
> 
> On Thu, Aug 15, 2013 at 2:14 AM, John Haddad <loserboy3000_at_hotmail.com>
> wrote:
> 
> Dear team,
> 
> What is the best approach to activate dual links load sharing or load
> balancing using routing protocol over the internet ?
> 
> If we have two ISP links coming to two routers and the ISP is using BGP to
> connect with us, what is the best approach to implement the following:
> 
> 1- if we have equal links from ISP
> 2- if we have unequal links
> 
> How can we control the outgoing traffic to have the ratio for example 1:3 in
> case of unequal links.
> 
> Thanks a lot
> 
> 
> The setup is the following:
> 
> Edge switch 2960 core switch 6509  ASA  router
> 
> 
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> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -- 
> Marc Abel
> 
> CCIE #35470
> 
> (Routing and Switching)
> 
> 
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