Redundancy with dual WLC

Hi, I will implement a WLAN network with AP1130AG and WLC 2125. If I understand right the whole traffic to/from the APs (data + management) will be first encapsulated in a LWAPP tunnel to/from the WLC ? Then, the WLC will forward the different traffic VLANs via a 802.1Q trunk to the network. Is it correct ? If so, the WLC is a true single point of failure ! What will happen if the WLC get out-of-service ? What is the impact on existing client sessions and new ones ? How will a redundant WLC 2125 work with the primary (active/standby with HSRP, load balancing)? What are the best practices in such a network ?
Thanks

Hi Jean-Pascal,
In the WLC world this is how an AP is covered in case one WLC fails. It is not without some "downtime" in case of failure but both Controllers are active. You have to keep in mind that an AP can only be registered to one WLC at a time so this is the best that you can do :) When one WLC fails the AP then has to re-register with the backup, this is not a completly seemless process.
This has some really good info;
WLAN Controller Failover for Lightweight Access Points Configuration Example
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a008064a294.shtml#c4
Hope this helps!
Rob

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Redundancy with dual nic servers

Hi I have 2 11500's configured with box-to-box redundancy. I have a number of app servers each with dual nic's (which are Teamed) and which are connected directly to the CSS's. Nic 1 in each goes to the master CSS1 and is therefore live. Nic2 goes to standby CSS2.The CSS's are connected two 4500 switches to the public.I am monitoring the links to the 4500's,if i switch off the master CCS1,we fail over and the servers all connect via nic2 to the new master CCS2. But when the link to the 4500 from the CSS1 Master goes down the CSS'S failover but the nic2's do not connect to the CCS2 because Nic 1 in each server has not failed ie they still see CSS1 as up. Is there a workaround to this problem ?
Thanks
J

I know of no way to link CSS interfaces so that if the uplink goes down, the the other ports are shutdown. There may be another way to configure the adapter teaming or failover on the server side. I know some OS's send out test frames from one adapter to the other to verify network integrity.
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N+1 redundancy with 2504-HA

Hello,
I have question regarding N+1 redundancy with 2504-HA WLC.
Can I use 2504-HA unit for H+1 redundancy? SSO is not needed
I have two wireless network:
1. With WLC 5508 with about 40 AP(1262), all them are A regulatory domain
2. With WLC 2504, with about 30 Mesh AP(1552), all of them are E regulatory domain
I plan to use two 2504-HA units for backups, one for network with WLC5508 and second for network with WLC2504.
In case N+1 redundancy is management with Prime mandatory ?

Hi,
Better to use same model and same software.
Case1: You have 5508WLC
Solution from my side: You must buy a another WLC with HA SKU license(Zero AP license). This wlc can work as N+1 and AP SSO as well as Client SSO but with higher version of code(7.5 or higher).
Case2: You have 2504 WLC
Solution: You must buy a another 2504 HA WLC: AIR-CT2504-HA-K9, that only supports N+1(No AP SSO and NO Client SSO)
http://www.cisco.com/c/en/us/td/docs/wireless/technology/hi_avail/N1_High_Availability_Deployment_Guide/N1_HA_Overview.html
More info:
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-1130-ag-series/qa_c67-714540.pdf
Regards
Dont forget to rate helpful posts

Hellp on Nokia E61i associating with Cisco WLC 4402

I met some problem with associate Nokia's dual mode mobile phone E61i with Cisco WLC 4402, hope someone can help me on it:
I setup a VOICE WLAN in 4402(v5.0.148), Layer2 security is WPA1+WPA2, Key management using 802.1x, WPA1 policy enable both TKIP and AES, Radius server using ACS engine(v4.1.1.23)(enable PEAP-MSCHAPv2);
I can use my laptop to join this WLAN(my laptop configure with PEAP/MSCHAPv2, WPA-TKIP, not validate server certificate), but can't let E61i join it, each time it will remind me âunable to connect, WPA authenticate failed).
In E61i, I select WPA/WPA2 as WLAN security mode, enable EAP-PEAP, under EAP-PEAP, I enable EAP-MSCHAPv2; however under Cipher, there's a lot of options such as âRSA,3EDS,SHAâ, âRSA,AES,SHAâ, but there's no TKIP, I have tried to enable all of them and tried only enable those items which include AES, but I failed each time with the same reminder âunable to connect, WPA authenticate failedâ. I checked ACS's failed log, there's no record; In 4402, there also have no record.
If I change the security to open or static WEP for VOICE WLAN, then the E61i can connect to the WLAN.
I think the problem maybe relate to encryption or certificate, right now I just do the test in lab, not in customer's real environment, so I use ACS to generate a self signed certificate and installed it in ACS.
Pls. help to point me what I need to adjust to make it work. Thanks!

Hello,
CCKM Key Management mode on Nokia E61i phone can be used
against Cisco LWAPP AP's with TKIP encryption
Nokia E61i (and other E-series WLAN enabled phones) are supporting CCKM key management method with both dynamic WEP and TKIP ciphers.
On the phone configuration, 802.1X security mode needs to be in use in order to enable CCKM support.Â WPA/WPA2 security mode on the phone is dedicated to standards basedÂ WPA and WPA2 methods and it does not allow usage of proprietary CCKM key management method.
Phone's 802.1X security mode does not mean that phone would only support dynamic WEP encryption method in this mode although in contexts term "802.1X" may be attached to pure dynamic WEP (legacy / pre WPA era)security methods.
Â 802.1X security mode can be seen on Nokia Eseries phones as sort of an "everything with EAP based authentication is allowed" mode, meaning that following key management and cipher configurations are supported:
- WPA-EnterpriseÂ = WPA Key Management (EAP based authentication) with TKIP encryption
- WPA2-EnterpriseÂ = WPA2 Key Management (EAP based authentication) with AES encryption
- Mixed WPA/WPA2-Enterprise = I.e. WPA/WPA2 Mode Migration WPA2 Key Management (EAP based authentication) with AES (for unicast data) and TKIP (for multicast data) ciphers
- 802.1X dynamic WEP = legacy (pre-WPA era) 802.1XÂ based dynamic WEP (EAP based authentication with dynamic WEP encryption)
Supported:
- CCKM with WEP = CCKM Key Management (EAP based authentication) with dynamic WEP encryption
- CCKM with TKIP = CCKM Key Management (EAP based authentication) with TKIP encryption
Not supported:
- CCKM with AES = CCKM Key Management (EAP based authentication) with AES encryption
Please note that CCKM-AES mode (CCKM Key Management with AES cipher) is not working properly due to some incompatibilities between Cisco and Nokia implementations thus it must not be listed as a supported combination on the current Nokia E-series devices. We are also seeing CCKM-Fast
Re-authentication failures with Cisco autonomous AP's when AES encryption is used althoughÂ initial authentication to autonomous AP's is successful.Â Nokia is currently working with Cisco to get CCKM-AES based authentications and roaming working properly with both LWAPP and autonomous Cisco AP's.
Â Also note that Nokia E-SeriesÂ does not support Cisco proprietary CKIP/CMIC encryption/data integrity methods. CKIP/CMIC is supported at least by Cisco autonomous AP's and it seems to be available also
at least on LWAPP AP version 4.1.171.0.
Â CCKM on E-Series devices has been tested against Cisco LWAPP (ver. 4.1.171.0) and it works when TKIP encryption is in use (WPA Policy + TKIP encryption in Cisco LWAPP configuration terms).
In practice this means Cisco LWAPP is configured in a following manner: WLAN -> Edit -> Security->Â
Layer 2 Security = WPA+WPA2
WPA+WPA2 Parameters:
-WPA Policy = enabled
-WPA Encryption = TKIP enabled, AES disabled
-WPA2 policy = disabled
-Auth.Key Mgmt = CCKM
Br,
-Pasi-

Trouble with Neo4 Platnum and AMD X2 with dual channel memory

I just installed an X2 3800+ in my Neo4 Platnum board. The board had a 3500 in it and ran fine. When I installed the X2, the machine will no longer POST if the memory is in the dual channel mode. I flashed to the latest BIOS (1.8) and it still does not work. I am using 2 Corsair XMS 2-2-2-5 Dimms each at 512MB. The PC POSTs fine if I place both modules in the Green slots. It does not work with 1 in green and 1 in purple (with either Dimms1-2 or 3-4). Has anyone else seen this?

Todd,
Your last post help me understand your situation a bit better. Here are some questions for you:
1- On your old system did these memory sticks work fine has a dual channel pair? Were these 2 memory sticks bought has a dual channel rated matched pair?
2- In your own words give me your definition of POST?
3- In your own words give me your exact detailed rendition of what happens when you try to post with dual setup. (How far do you get? Where does it hang up?)
4- Can you access your BIOS if booting with only one memory stick? If so, this is only for testing purposes, set your memory as 2.5,3,3,8, and 2T and add 0.05 volts to both your CPU and memory recommended voltages. Save, exit, and then shut down your system. Re-install the second stick of RAM in a proper dual channel slot. Re-boot and see what happens. If successful posting and booting in dual channel with this BIOS config go back to your BIOS and tighten your board and memory timings one at a time until you ID the perfect BIOS config for your CPU and RAM. Do the same with your CPU & RAM voltages.
AMD CPUs encompass their own memory control devices. There might just be enough variance between your older & newer AMD chips to reject dual configuration. If this is the case you may be able to correct it by using step for above. If this does not work, you sould borrow some suitable and proven dual channel memory sticks from a friend to see if the will work in your rig as dual channel?
Just keep on trucking & you'll solve it

Is it possible to connect my mid 2010 Macbook Pro with my 21.5" iMac 11,2 so that I can work with dual screens?

Is it possible to connect my mid 2010 Macbook Pro with my 21.5" iMac 11,2 so that I can work with dual screens?

try xxx - may work
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Dual-DMVPN Design with Dual Hubs on a single router ??

Hi All,
In DMVPN, in Dual-DMVPN Design with Dual Hubs , can a single router perform the role of dual hubs.
The router has two different internet links. It is intended that when one link goes down, spokes shud connect to the same router onto the other active internet connection. Is this possible ?

Since no one has answered yet, I'll give you the practical answer.
You'll have issues with IPSec and static routing. "DMVPN" itself probably wouldn't have an issue, but it would depend on IPSec and routing to work.
It is easier, by far, to put in a second router. And when you factor in your time to try to make it work (and it may not work), the second router is less expensive.
Rob

Use of business partner functionality in combination with dual control

Is there a generally agreed upon procedure to use the business partner functionality in combination with dual control? The problem is that when you block a business partner, the customer/ vendor master data aren't blocked automatically. You can then still use them in transactions, which leads to problems.
So is there a way to make this work or a procedure to do this?
Niels Vanwingh

Thanks Masa,
I did notice the 'Add external supplier from' in create supplier or bidder option. However there is a small catch and your experience may help.
Let me explain the requirement and scenario here in SRM 7.
We are implementing the Registration of Supplier scenario; both ROS and SRM are in same client. When a potential supplier registers themselves in the registration system, a BP number is created (an Internal number range is defined for this). After accepting the potential supplier in pre-select screen the purchaser has two options to transfer the potential supplier from the ROS system to SRM
Option 1: He can select the accepted potential supplier from the supplier directory option and transfer the business partner to SRM. In this case the business partner number of the potential supplier is retained in SRM and a business partner with supplier and bidder tag is created. However the purchaser does not have any option to select which type of business partner he would like to create like supplier or bidder.
Option 2: Purchase can go to create supplier or bidder option and choose the u2018Add external supplier formu2019 from the ROS system and create the business partner. The ROS business partner details are copied to the create supplier screen, but the purchaser have to provide an external business partner number for the supplier. This is because we have defined external number range for business partner for the vendors that are replicated from ERP to SRM.
Objective is the ROS business partner should be retained in SRM with option to create as supplier and bidder and then manually create ERP supplier with same SRM BP number and map against SRM supplier.
Is there any way we can achieve this?
In SRM 5.5 with Manage business partner functionality we could achieve as system give us the option which business partner type we would like to create as well as retains the ROS BP number in SRM.
Regards
Sandeep

New IMac 27"with dual internal hard drives

How do I manage Data on my new IMac 27"with dual internal hard drives? I have just migrated my data to my new computer. Since I've done it from a TM backup, it all went to the Analog HD. Ressearching online I've figured I could re-run Migrating assistant and replace different data between the SSD and the Analog. My problem now is: I want to keep my Music Library (iTunes), my Aperture Library and my documents on the analog, and use the SSD for System, Users and Apps. Aperture, is easy, because both Aperture and iPhoto can find their way, bt iTunes and My documents are a issue. Can Anyone help me?

Install OS X on the SSD:
Install or Reinstall Lion/Mountain Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Recovery HD:
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Erase the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your SSD volume (usually Macintosh HD) from the left side list. Click on
the Erase tab in the DU main window.
3. Set the format type to Mac OS Extended (Journaled.) Optionally, click on the Security button and set the Zero
Data option to one-pass. Click on the Erase button and wait until the process has completed.
4. Quit DU and return to the main menu.
Reinstall Lion: Select Reinstall Lion/Mountain Lion and click on the Install button. Be sure to change the target disk to your SSD.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
After you boot from the SSD open Users & Groups preferences. Click on the lock and authenticate. CTRL- or RIGHT-click on the user account and select Advanced Options. You will see a Home Dir: field with a Browse button on the right. Click on the button. Navigate to the HDD's Users folder. Select your account folder then click on the Open/Choose button. You must restart immediately.
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Can't get windows 8.1 with dual boot for fedora (linux) . system is UEFI .

Can't get windows 8.1 with dual boot for fedora (linux) . system is UEFI .

Hi,
Any update here?
We may seek help at Fedora forum as Milos suggested, if convenient we could share the related thread link here for reference.
In addition, please also check the information in the similar thread:
Dual Boot Windows 8 and Linux?
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Michael Shao
TechNet Community Support

Receiving multiple files with dual extension using file adapter

Hi,
The scenario where I am implementing requires multiple files of different names to be picked(ABC.txt) and dropped at destination(ABC.txt.pgp) up by my File Sender and Receiver adapters. Any idea on about how the configuration for receiving multiple files with dual extension for receiver adapter is to be done?
Note:- currently, The scenario is working fine without dual extension. i.e Its picking all files which starts with ABC and creating at destination as it is. even I configured as ABC.txt.pgp, but its not creating the second extension.
Thanks in Advance
Manmadha

Hi,
Try to concatenate '.pgp ' to the source file name to create the target file name for the receiver file adapter, by accessing the Adapter Specific Attributes using Java user defined function. This might work.
Reference links:
<a href="http://help.sap.com/saphelp_nw04/helpdata/en/43/03612cdecc6e76e10000000a422035/frameset.htm">SAP Help - Accessing Adapter Specific Attributes</a>
<a href="/people/michal.krawczyk2/blog/2005/11/10/xi-the-same-filename-from-a-sender-to-a-receiver-file-adapter--sp14 - XI: The same filename from a sender to a receiver file adapter - SP14</a>
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Is it possible to config H-REAP/REAP and CAPWAP in Autonomous mode with a WLC?

I'm going to deploying all new AP as Remote-Edge AP and they will be shipped straight to site. With a pool of WLCs deployed in central DC locations. I would like to get local staff to deploy a basic CLI discovery script for the APs. However, i thought LAPs don't have CLI???
I'm thinking I must use a Lightweight AP with the WLC to use Remote-Edge AP functionality - However, I'm not sure... the configuration example at the bottom doesn't state whether it an Autonomous AP or a Lightweight one.
http://www.cisco.com/en/US/products/ps6087/products_tech_note09186a0080736123.shtml
H-REAP Controller Discovery using CLI commands
H REAPs will most commonly discover upstream controllers via DHCP option 43 or DNS resolution. Without either of these methods available, it may be desirable to provide detailed instructions to administrators at remote sites so that each H REAP may be configured with the IP address of the controllers to which they should connect. Optionally, H REAP IP addressing may be set manually as well (if DHCP is either not available or not desired).
This example details how an H REAP's IP address, hostname, and controller IP address may be set through the console port of the access point.
AP_CLI#capwap ap hostname ap1130ap1130#capwap ap ip address 10.10.10.51 255.255.255.0ap1130#capwap ap ip default-gateway 10.10.10.1ap1130#capwap ap controller ip address 172.17.2.172
Could anyone help?
Cheers
Adrian.

Hi Adrian,
Further down in the doc you linked;
H-REAP Controller Discovery using CLI commands
H REAPs will most commonly discover upstream controllers via DHCP       option 43 or DNS resolution. Without either of these methods available, it may       be desirable to provide detailed instructions to administrators at remote sites       so that each H REAP may be configured with the IP address of the controllers to       which they should connect. Optionally, H REAP IP addressing may be set manually       as well (if DHCP is either not available or not desired).
This example details how an H REAP's IP address, hostname, and       controller IP address may be set through the console port of the access       point.
AP_CLI#capwap ap hostname ap1130
ap1130#capwap ap ip address 10.10.10.51 255.255.255.0
ap1130#capwap ap ip default-gateway 10.10.10.1
ap1130#capwap ap controller ip address 172.17.2.172
Note: Access points must run the LWAPP-enabled IOS® Recovery Image Cisco           IOS Software Release 12.3(11)JX1 or later, in order to support these CLI           commands out of the box. Access points with the SKU prefix of LAP (for example,           AIR-LAP-1131AG-A-K9), shipped on or after June 13, 2006 run Cisco IOS Software           Release 12.3(11)JX1 or later. These commands are available to any access point           that ships from the manufacturer running this code level, has the code upgraded           manually to this level, or is upgraded automatically by connecting to a           controller running version 6.0 or later.
These configuration commands are only accepted when the access point is       in Standalone mode.
Cheers!
Rob

How to use Real time execution trace toolkit with Dual-core processor??

hi there
the situation as follows:
i have a computer (PC and Laptop) types with Dual-core processors, and am trying to do simulation using Multi-core technology and based on different simulation scenarios...starting from sequantial processing,.......Piple lining processing strategy. so that i can differentiate the time delay between those types of processing based on (Using 1 processor then dual-core processor Computers)
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Hey,
The Realtime Execution Trace Toolkit only works for NI RT Targets.
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H67MA-E45 doesn't start with dual memory channel

I have just bought an H67MA-E45 motherboard and a brand new intel i5-2300 processor.
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When I install two same memory modules on DIMM1 and DIMM3 (dual channel configuration), I get the following problem: When I power on the computer, it turns on and instantly turns off. Then it powers on again on its own, but does nothing else. I get no beep error codes and the display doesn't show anything.
I use he on-board display adapter and I have only a sata II hard disk connected, nothing else.
Any suggestion what the problem might be?
Is there a way to check if there is a problem with the second memory channel?
PC details
Intel(R) Core(TM) I5-2300 CPU@280 GHz
MSI H67MA-E45 (ms-7678, Lga1155), Click BIOS, E7678IMS V1.2
KINGSTON KVR1333D3N9K2/4G DDR3 4GB (2X2GB) PC10666 1333MHZ
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My computer is now working only on one channel memory.
Every time I power the computer on, I get three short beeps, the third one is of slightly different tone. However, the manual does not have the beep codes written down, nor can I find them somewhere for the EFI BIOS (E7678IMS V1.2). Is there any link for the beep codes?
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Looking for dual wireless rechargeable headphone system with dual docks

I'm looking for a pretty specific product, and was wondering if anyone knows of a product that'll fit the bill.
I want a wireless dual headphone system with a charging dock for each headset. Transmitter should accept line level signal from dual RCA plugs. I'd prefer a 900mhz transmitter, but IR is acceptable. Either the system should come with two headsets or it should be a system with a transmitter/headset with the option to add a charging dock and an additional heaset.
My old system was a Sony which is on its last legs, and I found a replacement from another manufacturer with dual headsets but it lacks charging docks - you have to plug the heaset into the transmitter and both heasets can't be charged at once. Also, the manufacturer says not to charge a headset for more than 24 hours or you can damage the battery.
Anyone know if Sony or someone else makes what I want?
Solved!
Go to Solution.

Hi Verne,
Sony does not have manufacture dual Wireless Headphones. You can perform an Internet search and check for any third party dual headphones.
If my post answers your question, please mark it as an "Accepted Solution."

Redundancy with dual WLC

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