ArubaOS and Controllers

Reply
Contributor II
Posts: 39
Registered: ‎01-16-2010

Spectrum Load Balancing History

Is there any way to tell if SLB has ever been used? I've got two AP 105s that are ~50 feet apart (ceiling mounted w/ direct line of sight between them - there may be a fire sprinkler head between them, but nothing else) and they don't seem to be balancing at all well. At the moment one of APs has 20 users (5/15 for 2.4/5ghz) while the other has 3 (1/2). The clients are located between the two APs so they should be able to see both APs roughly equally.
Guru Elite
Posts: 21,523
Registered: ‎03-29-2007

Spectrum Load Balancing

There is nothing that keeps track of the history by AP specifically. Take a look at this post here for the principles and somethings to look for: http://airheads.arubanetworks.com/vBulletin/showthread.php?t=1910


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 39
Registered: ‎01-16-2010

Re: Spectrum Load Balancing History





That was helpful, but I'm a bit confused by the output:


(ITB-ARUBA6000-1) #show ap arm state ap-name CUC-HON-2-SOUTH

AP-CUC-HON-2-SOUTH:172.27.8.204:6:15:22.5-Edge:enable : Client Density:29
Neighbor Data
-------------
Name IP Address SNR Assignment Neighbor Density
---- ---------- --- ---------- ----------------
CUC-HON-2-NORTH 172.27.8.203 32 6/15 37/42/127/88
CUC-HON-3-LIT 172.27.8.227 7 6/15 7/13/24/53
CUC-HON-3-ASIAN-STUDIES-NORTH 172.27.8.234 10 6/18 0/2/0/0
CUC-HON-4-ELEVATOR 172.27.8.219 11 6/15 3/4/10/75

AP-CUC-HON-2-SOUTH:172.27.8.204:44:15:23-Edge:disable : Client Density:2
Neighbor Data
-------------
Name IP Address SNR Assignment Neighbor Density
---- ---------- --- ---------- ----------------
CUC-HON-1-WEST 172.27.8.200 25 44/15 1/6/50/16
CUC-HON-4-SOUTH 172.27.8.214 18 149/23 0/2/0/0
CUC-HON-2-ADMIN 172.27.8.230 24 161/23 0/5/0/0
CUC-HON-2-ADMIN-CONF 172.27.8.226 25 40/20 1/1/50/100
CUC-HON-2-NORTH 172.27.8.203 42 157/24 0/4/0/0
CUC-HON-1-ELEVATOR 172.27.8.202 18 36/20 1/10/50/10
CUC-HON-1-NORTH 172.27.8.201 7 44/15 0/5/0/0
CUC-HON-3-EAST 172.27.8.223 7 36/20 0


(ITB-ARUBA6000-1) #show ap arm state ap-name CUC-HON-2-NORTH

AP-CUC-HON-2-NORTH:172.27.8.203:6:15:22.5-Edge:disable : Client Density:42
Neighbor Data
-------------
Name IP Address SNR Assignment Neighbor Density
---- ---------- --- ---------- ----------------
CUC-HON-1-ELEVATOR 172.27.8.202 37 11/15 22/26/52/84
CUC-HON-2-ADMIN 172.27.8.230 15 1/18 7/19/16/36
CUC-HON-1-NORTH 172.27.8.201 18 1/15 18/19/42/94
CUC-HON-2-SOUTH 172.27.8.204 37 6/15 28/29/66/96
CUC-HON-4-SOUTH 172.27.8.214 20 11/15 6/7/14/85
CUC-HON-4-NORTH 172.27.8.246 16 1/18 4/21/9/19
CUC-HON-2-ADMIN-CONF 172.27.8.226 18 11/15 10/11/23/90
CUC-HON-1-WEST 172.27.8.200 38 11/15 26/27/61/96
CUC-HON-3-EAST 172.27.8.223 8 11/18 3/5/7/60
CUC-HON-3-LIT 172.27.8.227 16 6/15 8/13/19/61
CUC-HON-4-ELEVATOR 172.27.8.219 12 6/15 3/4/7/75

AP-CUC-HON-2-NORTH:172.27.8.203:157:24:24-Edge:enable : Client Density:4
No Neighbor Data Found


(ITB-ARUBA6000-1) #show ap active ap-name CUC-HON-2-NORTH

Active AP Table
---------------
Name Group IP Address 11g Clients 11g Ch/EIRP/MaxEIRP 11a Clients 11a Ch/EIRP/MaxEIRP AP Type Flags Uptime Outer IP
---- ----- ---------- ----------- ------------------- ----------- ------------------- ------- ----- ------ --------
CUC-HON-2-NORTH CUC-Main 172.27.8.203 4 AP:HT:6/15/22.5:L 10 AP:HT:157+/24/24 105 K 7d:19h:50m:5s N/A

Flags: R = Remote AP; P = PPPOE; E = Wired AP enabled; A = Enet1 in active/standby mode;
L = Client Balancing Enabled; D = Disconn. Extra Calls On; B = Battery Boost On;
X = Maintenance Mode; d = Drop Mcast/Bcast On; N = 802.11b protection disabled;
a = Reduce ARP packets in the air; S = RFprotect Sensor; d = Disconnected Sensor
M = Mesh; U = USB modem; K = 802.11K Enabled;

Channel followed by "*" indicates channel selected due to unsupported configured channel.

Num APs:1

(ITB-ARUBA6000-1) #show ap active ap-name CUC-HON-2-SOUTH

Active AP Table
---------------
Name Group IP Address 11g Clients 11g Ch/EIRP/MaxEIRP 11a Clients 11a Ch/EIRP/MaxEIRP AP Type Flags Uptime Outer IP
---- ----- ---------- ----------- ------------------- ----------- ------------------- ------- ----- ------ --------
CUC-HON-2-SOUTH CUC-Main 172.27.8.204 12 AP:HT:6/15/22.5 5 AP:HT:44+/15/23:L 105 K 11d:15h:54m:4s N/A

Flags: R = Remote AP; P = PPPOE; E = Wired AP enabled; A = Enet1 in active/standby mode;
L = Client Balancing Enabled; D = Disconn. Extra Calls On; B = Battery Boost On;
X = Maintenance Mode; d = Drop Mcast/Bcast On; N = 802.11b protection disabled;
a = Reduce ARP packets in the air; S = RFprotect Sensor; d = Disconnected Sensor
M = Mesh; U = USB modem; K = 802.11K Enabled;

Channel followed by "*" indicates channel selected due to unsupported configured channel.

Num APs:1


Does it handle spectrum load balancing independently for 2.4 and 5 GHz? Are the client counts total since reboot?

I think those numbers tells me that most clients can't see both APs on 5GHz and as a result they don't consider themselves virtual RF neighbors. They do consider themselves neighbors on 2.4, but since they are both on channel 6 they won't spectrum load balance. Is that accurate?

Guru Elite
Posts: 21,523
Registered: ‎03-29-2007

Spectrum Load Balancing

SLB is handled independently for 2.4ghz and 5ghz at this time.

In making the decision, it is not what the clients can see, it is what the APs can see. Once a client chooses a band and tries to associate, the controller looks at his client density and if his density is at the limit for that channel vs. his neighbors he will allow a user to associate to different access point. The show ap arm state command shows who the APs think are RF neighbors. The APs with the :L in "show ap active" will load balance the next station on that band because they believe they are at capacity vs. their neighbors.

Please know that there are a number of factors besides client number that ultimately determines client performance. SLB deals with one important one.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 39
Registered: ‎01-16-2010

Re: Spectrum Load Balancing History


The APs with the :L in "show ap active" will load balance the next station on that band because they believe they are at capacity vs. their neighbors.




Am I looking for ":L" in the flags column or in the "11g Ch/EIRP/MaxEIRP" column? I see in in the later above, but I'd always assume it would be in the flag column.
Guru Elite
Posts: 21,523
Registered: ‎03-29-2007

Not in flag column.

In the "11g Ch/EIRP/MaxEIRP" or "11a Ch/EIRP/MaxEIRP: column. If an L was in the flags column, we would not know what band it was referring to.


Colin Joseph
Aruba Customer Engineering

Looking for an Answer? Search the Community Knowledge Base Here: Community Knowledge Base

Contributor II
Posts: 39
Registered: ‎01-16-2010

Re: Spectrum Load Balancing History




Thanks. This helps make it make more sense. (I'd assumed it was in the flags column given that the key lists it as a flag. Perhaps it would make sense to have per-band flags and overall flags listed separately in two sections in the key.) Now that I know how to understand what's going on better, I'll check it again this evening as we hit peak periods in the library. Thanks.

Contributor II
Posts: 39
Registered: ‎01-16-2010

Re: Spectrum Load Balancing History

One other thing - When are the client density/overlap counts reset?
Search Airheads
Showing results for 
Search instead for 
Did you mean: