issues with SD-Wan and Extreme X450e-48p Stack

[jasonlsch]

Hi -

I have a X450e-48p Stack (eight switches) running 15.3.5.2 patch1-19. Having issues with SD-Wan devices. SD-Wan engineers are seeing lots of ARP requests coming from Stack flooding the SD-Wan.

I found this article: https://extremeportal.force.com/ExtrArticleDetail?an=000089782

I have tried adding ‘configure iparp vr VR-Default max_pending_entries 256’ twice. Saved twice. Doesn't take. Can I not add that to a stack? The only iparp configuration is: 'configure iparp vr VR-Default max_entries 4096'

Is there any reason not to do this: https://extremeportal.force.com/ExtrArticleDetail?an=000082722

'disable flooding unicast ports all'

What is the best way to slow down ARP requests coming from Stack?

Thanks for any help.

[BradP]

OK. The article states to reduce from the default 256 to somewhere in the range of 50-150. This is going to vary from network-to-network and we can't really make a recommendation for a proper value because we aren't familiar with your installation scenario.

Regarding disabling unicast flooding, it may make more sense to rate-limit instead:

https://extremeportal.force.com/ExtrArticleDetail?an=000082704

I'm not sure how that will impact your goal.

Brad

[jasonlsch]

yes it is.

so is:
configure iparp vr VR-Mgmt max_pending_entries 256
configure neighbor-discovery vr VR-Default max_pending_entries 1024
configure neighbor-discovery vr VR-Mgmt max_pending_entries 1024

Thanks

[BradP]

Hi jasonlsch

256 may be the default setting. If you run the command "show config detail | include max_pending_entries" does it have 256 as the setting in there?

Thanks
Brad