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Optimal Trunk(s) Config

  • 1.  Optimal Trunk(s) Config

    Posted 12-03-2019 02:33 PM
    Ive been looking at documentation on ISL and trunking and had a question.

    In a G620 TOR to X6-8 Core setup, what is more optimal.
    • 2 x (2 x 32) Trunks
      • G620 Ports 42 and 43 to X6-8 Ports 1/22 and 1/23
      • G620 Ports 46 and 47 to X6-8 Ports 2/22 and 2/23
    • 1 x (4 x 32) Trunk
      • G620 Ports 44-47 to X6-8 Ports 1/20 - 1/23

    Some of my thoughts
    • Easy to add 2x32 ports in a new trunk to the TOR if more bandwidth is needed
      • G620 Ports 40 and 41 to X6-8 Ports 3/22 and 3/23
    • Redundancy to the core across blades
      • Trunks across blades 1 and 2 (and more if needed)
    • Better ability to scale out to a mesh if additional X6-8 are ICL'd
      • Trunk Ports 40 and 41 to new X6-8 Ports 1/22 and 1/23

    I am sure there is some cons out there that I am not thinking over right now.
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  • 2.  RE: Optimal Trunk(s) Config

    Posted 12-04-2019 02:52 AM
    my recommendation has always been: redundancy is more important than trunking.    So from this alone I'd go for 2x32G to have blade redundancy on the core. Once you have redundancy you can add more bandwidth by either adding links to the existing trunks or creating new trunks. Exchange based load balancing does a pretty good job in distributing the load.  There are (corner case) use cases where trunks perform better, but redundancy is most important.

    Senior Systems Engineer
    Broadcom - Brocade Storage Networking