EXOS: ECMP via static routes ?

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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
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M.Nees, Embassador

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Posted 2 years ago

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Henrique, Employee

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Hi Matthias,

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

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That sounds good!

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

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Yes. In EOS, ECMP is enabled by default
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Baskar, Employee

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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"
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Tripathy, Priya Ranjan, ESE

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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.
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Henrique, Employee

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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. 
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M.Nees, Embassador

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Thanks to all for gathering this pieces of information together ... my planned project can start ;-))