ExtremeSwitching (EXOS)

  • 1.  EXOS: ECMP via static routes ?

    Posted 11-23-2016 18:43
    Does EXOS support ECMP (Equal Cost Multi Path) support with static routes ?

    I have 2x X670 and want setting up L3 connections to two other core switches via 2 separate L3 links which should be load-balanced.

    Is it possible to do ECMP with static routes in place of OSPF?

    Regards


  • 2.  RE: EXOS: ECMP via static routes ?

    Posted 11-23-2016 18:51
    Hi Matthias,

    Yes, you can have route sharing (using "enable iproute sharing" command) also for static routes.


  • 3.  RE: EXOS: ECMP via static routes ?

    Posted 11-23-2016 19:12
    That sounds good!

    Do you know if this is possible on S-Series with recent EOS too ??


  • 4.  RE: EXOS: ECMP via static routes ?

    Posted 11-24-2016 04:28
    Yes. In EOS, ECMP is enabled by default


  • 5.  RE: EXOS: ECMP via static routes ?

    Posted 11-24-2016 05:22
    Hi Matthias,

    ECMP is supported for static routes or dynamic routes learned via OSPF, BGP, or IS-IS protocols.

    In EXOS by default ECMP is disabled, to enable ECMP/Route sharing "enable iprout sharing"
    to verify the iproute sharing execute the "show ipconfig"



  • 6.  RE: EXOS: ECMP via static routes ?

    Posted 11-24-2016 06:11
    Hi

    In addition to what all say above IP Route sharing or ECMP allows a switch to forward packets to a destination network using multiple equal cost routes if they are present. Once we enable them switch creates an ECMP table which lists upto 8 next-hop gateways for each equal cost route.

    Please let us know if this helps you further.



  • 7.  RE: EXOS: ECMP via static routes ?

    Posted 11-24-2016 06:11
    ECMP limit numbers can be confirmed through the Release Notes since that depends on the platform and feature:

    http://www.extremenetworks.com/support/release-notes/

    Example for EXOS 16.1.4.2-patch1-3:
    • Routing protocol OSPF is limited to 16 ECMP gateways per destination
    • Routing protocols BGP and IS- IS are limited to 8 ECMP gateways per destination
    • Static routes are limited to 32 next-hops
    • L2VPNs are limited to 16 LSPs per pseudowire on platforms that support 32 gateways, and 64 LSPs per pseudowire on platforms that support 64 gateways.


  • 8.  RE: EXOS: ECMP via static routes ?

    Posted 11-24-2016 11:36
    Thanks to all for gathering this pieces of information together ... my planned project can start ;-))