topic RE: EXOS: ECMP via static routes ? in ExtremeSwitching (EXOS/Switch Engine)

EXOS: ECMP via static routes ?

M_Nees — Thu, 24 Nov 2016 02:43:00 GMT

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

RE: EXOS: ECMP via static routes ?

Henrique — Thu, 24 Nov 2016 02:51:00 GMT

Hi Matthias,

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

RE: EXOS: ECMP via static routes ?

M_Nees — Thu, 24 Nov 2016 03:12:00 GMT

That sounds good!

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

RE: EXOS: ECMP via static routes ?

Edward_Tsui — Thu, 24 Nov 2016 12:28:00 GMT

Yes. In EOS, ECMP is enabled by default

RE: EXOS: ECMP via static routes ?

Baskar — Thu, 24 Nov 2016 13:22:00 GMT

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"

RE: EXOS: ECMP via static routes ?

Tripathy__Priya — Thu, 24 Nov 2016 14:11:00 GMT

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.

RE: EXOS: ECMP via static routes ?

Henrique — Thu, 24 Nov 2016 14:11:00 GMT

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.

RE: EXOS: ECMP via static routes ?

M_Nees — Thu, 24 Nov 2016 19:36:00 GMT

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