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X440-G2 or X450-G2 as access switch?

X440-G2 or X450-G2 as access switch?

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FredrikB
Contributor II

‎04-30-2020 10:38 PM

Hi!

Would the X440-G2 be a suitable access switch in a large network? Segmentation is OK so most places where these would sit have some 15 VLANs and a total of max 2500 MAC addresses. The X440 (non-G2) was not a very good switch in these situations with its tiny little CPU and a nonexistent table space for arp, multicast routes and so on. I know the G2 has much larger tables and probably a better CPU, but is it suitable in this role? There’s no fancy stuff going on, just L2 with ELRP, LAG, and EAPS in some cases (only as transit node). Access is 1 G and uplink will be 2 x 10 G (so 10 G license needed for the X440-G2).

Do you regret not buying the X450-G2 instead? Are you happy with the X440-G2? Please let me know your thoughts!

/Fredrik

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Tomasz
Valued Contributor II

‎05-08-2020 01:19 PM

Hi,

I’ve seen deployments with 4-5 and up to 7 stacked X440-G2s. With 4-5 it was still ok (but rather small network utilization on average - number of APs, cameras, VoIP), with 7 it was tough when we enabled Extreme Policy (ONEPolicy in EXOS docs) and Telemetry at the same time. There was some issue with slice reservation for these features and I was struggling with that a bit. When both features finally got enabled on this huge stack, few times per hour some AP-facing ports were going down for few seconds. And so huge wireless area was down for couple of minutes (AP reboot due to controller loss). With EXOS 30.x couple of slice management and Policy behavior improvements have been introduced (per release notes) so perhaps it could be better now. But still, CPU for X440-G2 as a master node may be some caveat and personally I recommend not more than 5 units in a stack, but in the end it will depend on what features you wish to use and what is the traffic pattern.

 

Hope that helps,

Tomasz

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Necheporenko__N
Extreme Employee

‎05-01-2020 06:47 AM

Hi FredrikB,

It highly depends what are those hosts, if they are some windows hosts which generate a lot of link local service multicast like LLMNR/UPnP/mDNS then switch’s CPU will be always under stress. It is per standards that all those multicast streams should be cached, but any link flap may cause high CPU usage or even CPU congestions, and if you are using stacks at the Edge it will be multiply factor for the issue, as Master’s CPU must process much bigger number of operations. The solution for this is described in the article https://extremeportal.force.com/ExtrArticleDetail?an=000080382

this ACL should be applied on every single edge switch.

Also I would not recommend to configure aggressive ELRP timers, default values is OK.

If you will follow above recommendations X440G2 should be OK for you.

 

Best Regards,

Nikolay

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