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  1. #1
    Join Date
    Sep 2008
    Posts
    60

    Default Load Balancing with EIGRP

    Hi all,

    I seem to be confused about the above topic.
    I know that EIGRP can load balance over four equal cost paths (bu default), and six paths (configured). Also, one can manipulate the metrics so that all routes can have equal paths.

    BUT... the question is this: does the load balancing happen at Layer 2 or Layer 3? What is the difference between per-packet load balancing and per-destination load balancing?

    How best can one implement an effective load balancing with EIGRP over two WAN links from a remote location to the central office.

    Thanks for your contributions.
    a.k

  2. #2
    Join Date
    Dec 2010
    Location
    Left Coast, California
    Posts
    306

    Default

    your best bet here is cisco documentation, (and google) its a big topic...
    CEF, layer 2 link aggregation load balancing, process load balancing, default CEF souce/dest load balancing...

    start here http://www.cisco.com/en/US/docs/ios/...uide/pplb.html

    everything you need to know for ccna is in your second sentence.
    Kevin NET+SEC+A+CCNA
    'All that is not eternal is eternally out of date' ~ C.S. Lewis

  3. #3
    Join Date
    Dec 2010
    Location
    Left Coast, California
    Posts
    306

    Default

    Quote Originally Posted by ciscodaze View Post
    your best bet here is cisco documentation, (and google) its a big topic...
    CEF, layer 2 link aggregation load balancing, process load balancing, default CEF souce/dest load balancing...

    start here http://www.cisco.com/en/US/docs/ios/...uide/pplb.html

    everything you need to know for ccna is in your second sentence.
    heres is a better link
    http://tools.cisco.com/search/JSP/se...essLevel=Guest
    Kevin NET+SEC+A+CCNA
    'All that is not eternal is eternally out of date' ~ C.S. Lewis

  4. #4
    Join Date
    Nov 2008
    Location
    Birmingham, UK
    Posts
    1,425

    Default

    As far as EIGRP is concerned, the load balancing happens over L3. It does not concern itself with the layer aspects, other than the interface being up/up of course.

    To load balance over two WAN links equally, you would have to have two links of the exact same bandwidth and delay (using default K values) to get the same metric and therfore two sucessors, by default. Offset lists and unequal cost load balancing are also possible to influence the amount of routes added to the routing table. These are CCNP topics.
    CCNP R&S, CCNA DC
    Currently studying: CCIE R&S, CCNP Data Centre
    Follow my CCIE progress with study notes on my blog: http://beyondccna.blogspot.co.uk/

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