Thanks Philippe, Is load-balancing the only algorithm available for this method of VLAN assignment? --Bruce Johnson
________________________________ From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:wireless-...@listserv.educause.edu] On Behalf Of Philippe Hanset Sent: Thursday, May 28, 2009 12:56 PM To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU Subject: Re: [WIRELESS-LAN] ARuba VLAN pooling If my memory serves me well, there is a capacity caveat to Aruba's VLAN pooling at the moment: (might change in a future code release) 1 SSID = 1 VAP = 1 Pool = Max 32 VLANs So if you use /24, a maximum of 8096 ((256 - 3(gateway, network, broadcast)) * 32) users is the limit for one SSID. Not too many places have to worry about exceeding this number, but it's good to keep in mind! Philippe Univ. of TN On May 28, 2009, at 12:34 PM, Garrett Harmon wrote: We've also loved vlan pooling, and the distribution of clients across the /24's is excellent. As we start to see our vlans becoming highly utilized, we simply add another /24 to the pool and slowly the distribution evens out again, current users are not affected until they disconnect and reconnect at which point they'll likely receive a new vlan assignment, while new users immediately get hashed into the new algorithm. Garrett Harmon Network Engineer Office of Information Technology The Ohio State University 614.292.2122 (o) 614.747.5539 (c) On May 28, 2009, at 11:45 AM, Michael Dickson wrote: We find that Vlan Pooling does a really good job at "balancing" the users across our 24 client vlans. We have eighteen client vlans on our main SSID and I'm impressed with the even distribution this feature offers. If you have multiple local controllers make sure that the client vlans are properly configured on each controller for both L2 and L3. This will ensure that the clients can roam across "controller boundaries" with the same IP address. Also, we found it helpful to size each client vlan/subnet the same (again we use /24 subnets) Hope this helps. Mike ******************************* Michael Dickson Network Analyst University of Massachusetts Network Systems and Services ******************************** Ken Connell wrote: Assuming you you have multiple client side vlans already configured on your controller, you assign those vlans to the vap (currently your only specifying one vlan, just comma seperate and add another ). Now when a user associates, there is hash done on the client mac address and they are placed in a vlan based on the output of the hash. That mac will always hash out the same, and they will therefore always be put into the same vlan. Just be careful if you have any static clients or use reserved DHCP, cause once you add another vlan to the pool, they'll more than likely hash out to a diff vlan and therefore require a diff IP of course.... We've been using that since it was available and have no complaints. Ken Connell Intermediate Network Engineer Computer & Communication Services Ryerson University 350 Victoria St RM AB50 Toronto, Ont M5B 2K3 416-979-5000 x6709 ------------------------------------------------------------------------ *From*: Jason Appah *Date*: Thu, 28 May 2009 08:16:07 -0700 *To*: <WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU> *Subject*: [WIRELESS-LAN] ARuba VLAN pooling What is this VLAN pooling? How does it work? ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. -- BEGIN-ANTISPAM-VOTING-LINKS ------------------------------------------------------ Teach CanIt if this mail (ID 879804209) is spam: Spam: https://antispam.osu.edu/b.php?c=s&i=879804209&m=307de3940232 Not spam: https://antispam.osu.edu/b.php?c=n&i=879804209&m=307de3940232 Forget vote: https://antispam.osu.edu/b.php?c=f&i=879804209&m=307de3940232 ------------------------------------------------------ END-ANTISPAM-VOTING-LINKS ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/. The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail. ********** Participation and subscription information for this EDUCAUSE Constituent Group discussion list can be found at http://www.educause.edu/groups/.
