Does Extreme support load cost balancing with ISIS Protocol?

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Can anyone tell me if the extreme ISIS implementation supports equal load cost balancing?
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Steve Webb

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Posted 4 years ago

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PARTHIBAN CHINNAYA, Alum

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Extreme does support ECMP.
We have to enable ECMP.
I have not tested this with ISIS.
May I know the reason for preferring ISIS over OSPF?
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Steve Webb

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A customer config requires ISISCan you tell me how to enable ECMP?
Thanks.
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PARTHIBAN CHINNAYA, Alum

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As per documentation it does support.
Please find the below information:

enable iproute {ipv4} sharing {{vr} vrname} | {{vr} all}}Description
Enables load sharing if multiple routes to the same destination are available. When multiple routes to
the same destination are available, load sharing can be enabled to distribute the traffic to multiple
destination gateways. Only paths with the same lowest cost are shared.


Usage Guidelines
IP route sharing allows multiple equal-cost routes to be used concurrently. IP route sharing can be used
with static routes or with OSPF, BGP, or IS-IS routes. In OSPF, BGP, and IS-IS, this capability is referred
to as equal cost multipath (ECMP) routing.
Configure static routes and OSPF, BGP, or IS-IS as you would normally. The ExtremeXOS software
supports route sharing across up to 32 ECMP static routes or up to 8 ECMP routes for OSPF, BGP, or ISIS.
However, on the BlackDiamond 8800 family, SummitStack, and Summit family switches, by default,
up to four routes are supported. To support 2, 4, 8, 16 or 32 routes on these switches, use the following
command:
configure iproute sharing max-gateways max_gateways
If a VR is not specified, this command enables IP route sharing in the current VR context.



configure iproute sharing hash-algorithm crc
configure iproute sharing max-gateways


Usage Guidelines
When IPv4 or IPv6 route sharing is enabled, the maximum number of gateways value represents the
maximum number of next-hop gateways that can be used for communications with a destination
subnet. Each gateway represents an alternative path to a subnet. The gateways can be defined with
static routes, or they can be learned through the OSPF, OSPFv3, BGP, or IS-IS protocols. The value for
max-gateways applies to both IPv4 and IPv6 on all VRs.

The ExtremeXOS Release Notes also lists the total number of route destinations and the total
combinations of gateway sets that each platform can support with the different max-gateways option
selections. For more information on selecting the maximum number of gateways and how this affects
different platforms, see ECMP Hardware Table.


I hope this is clear.
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PARTHIBAN CHINNAYA, Alum

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I would recommend using a stable EXOS version .
If you are running 15.3.1.4---move to latest patch
If 15.4.1.3 move to latest patch.