Cisco Wireless LAN Controller (WLC) Interface Groups

See the configs for the switch and the WLC for LAG, and the use of Interface Groups assigned to WLAN SSIDs.

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[kielmoreland]

Great video Keith! I've always wondered about this aspect of WLCs.

During a hotel event that I was managing, our NOC had to do this very thing in order to keep the client's network running. Clients told us that they were coming with 2000 devices to the event space that needed wireless access so we configured the network with a /20 subnet and 500 Mbps of bandwidth just to be safe. On day one of the event SolarWinds started freaking out because not only had they surpassed 2000 devices but exhausted the DHCP pool in a matter of minutes and maxed their bandwidth (thank God we had a 10 Gbps ISP circuit). All told, by the end of the event, 8000+ devices were connecting to the wireless network each day over the 4 day event, and were consistently using 2 Gbps of bandwidth down during their breakouts and general sessions. The group was doing online tests and surveys that all attendees had to take throughout the entire event in order to receive credit and so everyone needed wireless access (a small detail the meeting planners didn't tell us), and trainers were actively downloading content and videos during their sessions. We ended up linking 5 VLANs/subnets together in our Cisco 5520 WLC in order to handle all the devices and better manage their bandwidth. Needless to say, that first day of the event, my team and I were sweating bullets.

[BurningSwade]

This cleared up a bunch of questions I had. I really appreciate your content, Keith.

[kuqezi]

The terminal color scheme is so relaxing for my eyes.
Love your content Keith, thanks alot.

[mohammedsajid]

The Way he was explained that was really and again its awesome .. really we had a great session

[kayefiq]

Thanks Keith... Great to learn from you as always. Stay safe

[mohdfahadgm]

Sir Keith, Amazing video! I'm going to challenge myself to complete this series. The bits covered are REAL GOLD of information in day to day Networking Support! Thank you :D - Fahad

[dhiasalah]

Keith, thanks for your motivation, much love from TUNISIA

[peter]

Hi Keith, another great video, option 43 info was very useful. I have a similar setup on home Wi-Fi lab. Initially I was having issues with the AP's not joining WLC. After a bit of T shooting finally got them talking to each other. WLC download image to AP's. Love it when you get the blue solid LED. Having the correct date on time helps on the WLC. Many thanks..

[tamaspeter]

Great lesson, thank you Keith! More WLC tutorial, please!

[ceoeva]

Nice one, never really had to use this concept but it's good to see. Thanks

[MrJayskata]

Thanks Kieth, this clears up my question of what's the use case of Interface group :)

[cresrey]

Again very informative and easy to understand video.. Thank you very much Sir Keith Barker

[odisseoalcatraz]

Awesome Keith great explanation as always. Hi from Mexico! Jeje

[asa]

Thank you so much Kieth! Extremely practical video. I love you (no homo).
Please more on wireless because that’s what we are lacking + there is high demand on it.

[srb]

Keith - excellent video! I am studying for the ENCOR and the interface group really had me wondering "what problem does this Thanx for clearing it up.👍

[aniswlidi]

Great lecture Keith. I Understand all about the Wireless architecture but I'm not able to focus....

[hughlancaster]

Great videos. When you create a logical interface, did you first create the vlans on the switch and move the those APs over to those VLANs? That part confuses me

[elgodot]

Woah Keith! Nice job! What type of terminal are you using that is distinguishing lines with different colors? That is a superb feature, one I haven't seen. I think any of us would be thrilled to use such terminal. Thanks!

[victorcossio]

how is the traffic divided in the Interface groups? do they use round-robin? or some hashing algorithm?

[craigle-butt]

Hi, Interface group help out hell of a lot, one thing to know once you've added a subnet you can't remove it while that interface group is connected to a wlan. Which would affect your wlan.