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.
Keith - excellent video! I am studying for the ENCOR and the interface group really had me wondering "what problem does this solve.....?" Thanx for clearing it up.👍
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..
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.
Great staff Keith! Just one question I calculated 77 in hex and it worked out as 4D. Did I miss something? Thanks. Keep this very informative stuff coming. JB
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!
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
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
always good explanations sir !!!. the question that has been haunting me lately (since I'm a guy who loves details), is: at what point is the dynamic interface used in the packet traveling from the wirelles client to the wired network (and vice versa)? Thnks
Thank you ramzi boutaoua. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again ramzi boutaoua!
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.
Depends on on what you want to achieve. If you use normal wireless configuration, access port should do the job but, if you want to get into flex connect groups, we might need to to make the ap connected port to trunk. So, it always implantation dependent and what you are trying to achieve
Thank you Amit Panwar. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again Amit Panwar!
Nice quick demonstration. But my question what load balance technique used by WLC ? I'm not Wireless guy. but as far i i know Cisco use Aggressive Load Balancing. Please advice.
@@KeithBarker Thanks Keith for the answer. i did almost same topology, i notice only one interface of LAG sent/receive the traffic in EtherChannel (Sw1#show int | inc line|rate), i stress the network using ping x.x.x.x size 18024 still same result. then i change the Cisco default algorithm to port-channel load-balance src-dst-ip (all 4 interfaces sending/Receiving the traffic in differentiation way (not equal) but the others interfaces works👌. i have no idea what Cisco use to load the balance. but i love to share this result with you.
I'm facing a tough case with this WLC, my distant sites are experiencing several signal cut-off but APs that are installed within the main office are not concerned by this very boring situation! I'd be happy to get your feedback !? Pls note that this situation is concerning also IP phone and any other equipment that use the wireless link. To make matters worse, after 5 ot 15min everything reconnect themself as if nothing happened
Thank you for the question Waqar. In this video I think it is SecureCRT with a using a word color plugin. However, another great tool with color coding is MobaXterm, and it has a free version.
Great lesson.. But I'm trying to used option 43 on packet tracer which I can't find, so how do I lab it up on Pkt with each AP on different vlans by using WLC.
Thank you for the question Okpala. In a PT DHCP server, just put the IP address of the WLC (there is a spot for that), and that will offer the IP address as option 43 in DHCP (within Packet Tracer).
Question, I need to change the Static IP of 100's of AP's on a controller, what's the best way to do this , not interested to do one by one on GUI. thanks
I've only ever gotten the hex TLV to to work when using option 43. The other methods are hardcoding the IP on each ap. (no thank you) or adding a DNS entry to I believe its cisco-wireless-controller. I've seen that work as well.
Hi Keith. If you make an interface group, and your using different subnets like that, surely you will have problems with DHCP renewals when roaming clients get dumped onto the other VLAN. I'm wondering how do you solve that problem, since it will disconnect them and re-connect them (which will be quite visible on a video conference, where'as if you used the same subnet throughout the SSID, the roam would be almost seamless).
Thank you Stevie Boy. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord Thanks again Stevie Boy!
I have an issue with Wireless Controller x DHCP, from time to time it stops work, the client can get authenticated but without IP addresses, I cannot find the issue here to remediate I am constantly clearing the ARP table. This is a kind of issue we cannot find in Cisco's books, and courses.
Thank you for the question Gibson Onyenekwu. The answer is yes, with a few limitations. Check out my Packet Tracer playlist. It has at least 3 WLC related labs, with instructions on how to download them for free. Enjoy.
Dear Sir, My problem is that My Management IP:- 192.168.60.252 AP IP:- 192.168.60.5We Want Aasing IP Address to Wireless Client:- 192.168.12.2, 255.255.252.0 with VLAN ID:- 15Kindly help us I'm stuck at Projects Site. Kindly do the needful
A company wants to implement a large number of WAPs throughout its building and allow users to be able to move around the building without dropping their connections Which of the following pieces of equipment would be able to handle this requirement? (A). A VPN concentrator (B). A load balancer (C). A wireless controller (D). A RADIUS server Could you please help me find the correct answer to the question above?
![ARGENTINA vs. BOLIVIA [6-0] | RESUMEN | ELIMINATORIAS SUDAMERICANAS | FECHA 10](http://i.ytimg.com/vi/C3wPtKNbAOA/mqdefault.jpg)
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.
The terminal color scheme is so relaxing for my eyes.
Love your content Keith, thanks alot.
Glad you like them!
The Way he was explained that was really and again its awesome .. really we had a great session
Glad you liked it
Thanks Kieth, this clears up my question of what's the use case of Interface group :)
Happy To Help!
Great lesson, thank you Keith! More WLC tutorial, please!
You got it!
Keith - excellent video! I am studying for the ENCOR and the interface group really had me wondering "what problem does this solve.....?" Thanx for clearing it up.👍
Happy to do it, thanks for the feedback SRB.
Keith, thanks for your motivation, much love from TUNISIA
Thank you dhia salah!
This cleared up a bunch of questions I had. I really appreciate your content, Keith.
Again very informative and easy to understand video.. Thank you very much Sir Keith Barker
You are very welcome
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..
Thank you Peter! I often will have to manually set the clock on the AP at the CLI as well, especially if I haven't used them in a long time.
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.
Thank you ASA
Great staff Keith! Just one question I calculated 77 in hex and it worked out as 4D. Did I miss something?
Thanks. Keep this very informative stuff coming.
JB
77 in decimal equates to 4D in hex.
Thanks Keith, you are the law
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!
Thank you for the question, that app is MobaXterm. Enjoy!
Thanks Keith... Great to learn from you as always. Stay safe
Thank you Kaye Shafiq!
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
Excellent!
Awesome Keith great explanation as always. Hi from Mexico! Jeje
Hey, thanks! Glad you are here Odisseo!
Nice one, never really had to use this concept but it's good to see. Thanks
Thank you Christian Omenyi Jr
Very helpful, thank you Keith!
Keith, do you have an entire training course on Cisco 9800/Wireless?
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
Nice coloring on your Terminal Emulator Keith, what software do you use to get this? Nice rack in the background also! :)
That is mobaxterm
Thank you Ken, as TheHelioper mentioned it is MobaXterm. There is a free version, and it is fantastic.
always good explanations sir !!!.
the question that has been haunting me lately (since I'm a guy who loves details), is: at what point is the dynamic interface used in the packet traveling from the wirelles client to the wired network (and vice versa)?
Thnks
Thank you ramzi boutaoua. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord
Thanks again ramzi boutaoua!
Great teaching!
Thank you!
I like the way you have explained , it is very useful topic , can you recommend for us any course or website to get more information about WLC
Thank you for the question. ruclips.net/video/lQvcPLgjfhQ/видео.html
how is the traffic divided in the Interface groups? do they use round-robin? or some hashing algorithm?
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.
I love you content Keith, but i have one question, APs connected to the switch is switchport mode access vlan 30 or you use trunk ?
Depends on on what you want to achieve. If you use normal wireless configuration, access port should do the job but, if you want to get into flex connect groups, we might need to to make the ap connected port to trunk. So, it always implantation dependent and what you are trying to achieve
@@techevangelist8373 Ty tech...
Great work ...
Thank you! Cheers!
Nice one G
Thank you Jaydon Ion!
@@KeithBarker Bloody passed! Wish I had access to a nice donation but all I have is love for you, mwah
Thanks !
Very informative video.
Query: How to use existing DHCP sever to assgin IP address to wifi connected device.
Thank you Amit Panwar. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord
Thanks again Amit Panwar!
Great content as usual..
Much appreciated
Nice quick demonstration. But my question what load balance technique used by WLC ? I'm not Wireless guy. but as far i i know Cisco use Aggressive Load Balancing. Please advice.
Thank you Murad Elmgbar, I don't know what method it uses to distribute the load between interfaces in the interface group.
@@KeithBarker Thanks Keith for the answer. i did almost same topology, i notice only one interface of LAG sent/receive the traffic in EtherChannel (Sw1#show int | inc line|rate), i stress the network using ping x.x.x.x size 18024 still same result. then i change the Cisco default algorithm to port-channel load-balance src-dst-ip (all 4 interfaces sending/Receiving the traffic in differentiation way (not equal) but the others interfaces works👌. i have no idea what Cisco use to load the balance. but i love to share this result with you.
Thank you brother.
You are welcome
thanks for this, useful :)
No problem! Thank you.
I'm facing a tough case with this WLC, my distant sites are experiencing several signal cut-off but APs that are installed within the main office are not concerned by this very boring situation! I'd be happy to get your feedback !? Pls note that this situation is concerning also IP phone and any other equipment that use the wireless link. To make matters worse, after 5 ot 15min everything reconnect themself as if nothing happened
2:02 Which terminal software is that? Color themes looks good
Thank you for the question Waqar. In this video I think it is SecureCRT with a using a word color plugin. However, another great tool with color coding is MobaXterm, and it has a free version.
@@KeithBarker thx for response
Great lesson.. But I'm trying to used option 43 on packet tracer which I can't find, so how do I lab it up on Pkt with each AP on different vlans by using WLC.
Thank you for the question Okpala. In a PT DHCP server, just put the IP address of the WLC (there is a spot for that), and that will offer the IP address as option 43 in DHCP (within Packet Tracer).
Question, I need to change the Static IP of 100's of AP's on a controller, what's the best way to do this , not interested to do one by one on GUI. thanks
Hi, how to configuer maximum number for accessing devices in wlc
bro i have topology for WCL with 2 lan cable input.. i;ve checked in the switch there are just trunk no lacp group. can u tell me about it
for everyone who couldn't get address for his wireless clients, you need to disable dhcp proxy on your controller.
Good one sir, just to know the possibility can we control tagging of vlans, like for a specific user to tag for a specific vlan id with same SSID?
Thank you for the question Anil, I don't know the answer to that.
@@KeithBarker thank you 🙇 for the response sir
I've only ever gotten the hex TLV to to work when using option 43. The other methods are hardcoding the IP on each ap. (no thank you) or adding a DNS entry to I believe its cisco-wireless-controller. I've seen that work as well.
Thanks for sharing
ogit
Thank you Waqar Ahmed!
Hi Keith. If you make an interface group, and your using different subnets like that, surely you will have problems with DHCP renewals when roaming clients get dumped onto the other VLAN. I'm wondering how do you solve that problem, since it will disconnect them and re-connect them (which will be quite visible on a video conference, where'as if you used the same subnet throughout the SSID, the roam would be almost seamless).
Thank you Stevie Boy. Feel free to join my Discord sever. Lots of people there helping each other out. Each Saturday at 10am Pacific I hold my "Office Hour" where learners can ask questions about the topics they are studying. Mostly focusing on Cisco CCNA 200-301 topics. Feel free to join us there live if you are available. Here is the link ogit.online/Join_OGIT_on_Discord
Thanks again Stevie Boy!
How does it load balance? Is there a way see and edit that? I'm not sure if it acts as a spill over or soemthing.
Thank you for the question Barsa, I don't know the internal mechanism used. Perhaps someone who knows can chime in and let us know.
Can I setup multiple APs using single SSID?
Does that mean you're a scientist now?
I have an issue with Wireless Controller x DHCP, from time to time it stops work, the client can get authenticated but without IP addresses, I cannot find the issue here to remediate I am constantly clearing the ARP table. This is a kind of issue we cannot find in Cisco's books, and courses.
Sorry to hear that
Can wlc be simulated on packet tracer
Thank you for the question Gibson Onyenekwu. The answer is yes, with a few limitations. Check out my Packet Tracer playlist. It has at least 3 WLC related labs, with instructions on how to download them for free. Enjoy.
Dear Sir,
My problem is that
My Management IP:- 192.168.60.252 AP IP:- 192.168.60.5We Want Aasing IP Address to Wireless Client:- 192.168.12.2, 255.255.252.0 with VLAN ID:- 15Kindly help us I'm stuck at Projects Site.
Kindly do the needful
A company wants to implement a large number of WAPs throughout its building and allow
users to be able to move around the building without dropping their connections Which of the
following pieces of equipment would be able to handle this requirement?
(A). A VPN concentrator
(B). A load balancer
(C). A wireless controller
(D). A RADIUS server
Could you please help me find the correct answer to the question above?
Thank you for the question Birol Görmez. The way to centrally manage a group of APs is using a controller. (option C)