Load Balancing using eBGP
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06-03-2012 03:35 AM - edited 03-04-2019 04:33 PM
Do the 2 links should same bandwidth?
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06-03-2012 06:26 AM
Henry
When using BGP there is no requirement to have equal bandwidth for load balancing.
BGP metrics, and BGP route determination do not have any thing that checks on bandwidth.
HTH
Rick
Rick
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06-03-2012 07:03 AM
BGP RIB and IGP RIB are completely different Henry. IGP's such as RIP, EIGRP, OSPF, all have specific metrics and algorithms you can modify to tune it to your liking or leave it at the default. EIGRP has Bandwidth and delay by default, and OSPF has cost. BGP, left to it's default, makes RIB decisions based on shortest AS-Path. If you have multiple entries with the same AS-Path you can start manipulating various other parameters such as Weight (Cisco only), Local Preference, MED values, etc etc.
Are you load-balancing via eBGP with the same ISP or different ISPs?
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06-10-2012 07:29 AM
MED can be used only if the ISP's support it hey!
I would still stick with local pref only if Henry has two ISP's and wants to load balance outbound traffic..
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06-03-2012 07:33 PM
Simple answer is NO.
If you want to know more about load balancing/sharing in BGP then please see below links.
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml
http://stack.nil.com/ipcorner/LoadBalancingBGP/
HTH
Kishore
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06-09-2012 06:46 AM
Henry, are you talking about inbound or outbound load balancing and or both?
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07-28-2012 08:48 PM
was just thinking about this one a while back... we could use IPSLA to force the BGP path to be different if one of the links is over loaded.. IPSLA parameters could be that the latency or even rtt..

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07-29-2012 12:45 PM
No, they can be on entirely different bandwidth. May be one used for primary and other as a backup
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