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Notes:
Besides considering equal cost paths for load balancing, some vendors also support unequal load balancing by relying on the link bandwidth extended community that allows routers to determine the bandwidth of external links. See :
S. Sangli, D. Tappan, Y. Rekhter, BGP Extended Communities Attribute, Internet draft, work in progress, Nov. 2002
http://www.ietf.org/internet-drafts/draft-ietf-idr-bgp-ext-communities-05.txt
For a vendor usage of this community, see :
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087afe.html