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Occasional Contributor II
Posts: 16
Registered: ‎11-17-2011
Broadcast Multicast ( BCMC ) Bonjour Problem

We are a K-12. Our wired network is divided into two huge /16 subnets.  Secondary Blocks are 172.16.0.0 / 16 and Primary has 172.17.0.0 / 16.  Block = Building.

 
Secondary School is mainly in blocks 1, 2,3, (... 4 admin)
Primary School is located in blocks 5,6,7
 
Our present Aruba setup goes like:
 
SSID   / VLAN  / Broadcast Multicast (BCMC) on SSID Level
 
Guest SSID  / 172.20.0.0 / 16 / DROPPED
Student SSID  / 172.21.0.0 / 16  / ALLOWED
Staff SSID  / 172.22.0.0 /16   /  DROPPED
BYOD SSID  / 172.23.0.0 / 16 / DROPPED
 
So regardless of your location, whether you are in Block 1 or Block 6, if you are connected to Staff SSID, you will be GRE-tunneled into 172.22/16 range. So if Bonjour is on, Apple TVs in Primary Block can be seen by computers in the Secondary.
 
Secondary school has around 900 Macbook Pros and ~200 iOS devices. 
Primary school has  500 Macbook pros and ~500 iOS devices. 
Our concurrent client count max out at around 1,500. 
 
Most of Primary School is connected to Student SSID while Secondary is in Staff SSID (for both student and staff devices).
 
BCMC is ALLOWED in Student SSID and DROPPED for the rest. The moment we ALLOW BCMC in Staff  SSID, instantly our network will come crashing!  Ping time outs, server unreachable, error rates on our switches goes to the roofs! And this affects both wired and wireless clients. 
 
Basically for Secondary School, Bonjour is not readily available as their laptops are configured by default to connect to Staff SSID, they have to switch to Student SSID if they want to use Airplay or any other Bonjour services. 
 
Our APs are mixed of AP121, AP105 and AP61 (very few AP125 and AP135). Total inventory of around 140. 
 
Our core and distribution switches are CISCO. Besides storm control on the CISCO switches, is there a particular BCMC setting that we can tweak to help us with our present situation?Our core switches are 45xx and distribution switches are 29xx. 
 
Cheers,
Marlon
Guru Elite
Posts: 20,795
Registered: ‎03-29-2007
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

Why are you not dropping broadcasts on all Virtual APs or putting BCMC on all VLANs?



Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 16
Registered: ‎11-17-2011
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

We are a heavy Mac shop. We need Bonjour to work.  We have iPad apps that will never work if broadcast/multicast is disabled on SSID level. Hence, our workaround is to enable it on at least one SSID.

 

We tried BCMC optimization on VLAN level, but the moment we put it on, the entire network  went down to the point we even have to connect a console cable just to revert the setting, because the WEB GUI was inaccesible.   :( 

Guru Elite
Posts: 20,795
Registered: ‎03-29-2007
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

You would need to run a Airgroup-Enabled version of ArubaOS (6.3.x and above) so that you can have drop broadcasts on, but still use bonjour applications.  Your VLANs are too large and have wired clients, so you have no choice but to have drop broadcasts, or VLAN BCMC optimization on, because broadcasts would degrade your wireless network otherwise.

 

I would wait for 6.3.1.0, which should be coming out soon with some fixes.



Colin Joseph
Aruba Customer Engineering

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

Occasional Contributor II
Posts: 16
Registered: ‎11-17-2011
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

We are still on 6.1.3.   Maybe an upgrade would help. 

 

Thanks cjoseph!  As always your inputs are highly regarded. 

Frequent Contributor I
Posts: 125
Registered: ‎07-06-2010
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

cjoseph wrote:

You would need to run a Airgroup-Enabled version of ArubaOS (6.3.x and above) so that you can have drop broadcasts on, but still use bonjour applications.  Your VLANs are too large and have wired clients, so you have no choice but to have drop broadcasts, or VLAN BCMC optimization on, because broadcasts would degrade your wireless network otherwise.

 

I would wait for 6.3.1.0, which should be coming out soon with some fixes.


I am working with another organization that simply does not understand this at all.... They are a large mac location with over  2500 wired and wireless devices all on a single subnet (that also includes all of their management stuff as well) and they keep complaining about connectivity issues, but just blame the hardware... It really does drive me crazy...

Guru Elite
Posts: 20,795
Registered: ‎03-29-2007
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

danstl wrote:

cjoseph wrote:

You would need to run a Airgroup-Enabled version of ArubaOS (6.3.x and above) so that you can have drop broadcasts on, but still use bonjour applications.  Your VLANs are too large and have wired clients, so you have no choice but to have drop broadcasts, or VLAN BCMC optimization on, because broadcasts would degrade your wireless network otherwise.

 

I would wait for 6.3.1.0, which should be coming out soon with some fixes.


I am working with another organization that simply does not understand this at all.... They are a large mac location with over  2500 wired and wireless devices all on a single subnet (that also includes all of their management stuff as well) and they keep complaining about connectivity issues, but just blame the hardware... It really does drive me crazy...


"It works on wired just fine"....

 



Colin Joseph
Aruba Customer Engineering

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

Frequent Contributor I
Posts: 125
Registered: ‎07-06-2010
Re: Broadcast Multicast ( BCMC ) Bonjour Problem

cjoseph wrote:

danstl wrote:

cjoseph wrote:

You would need to run a Airgroup-Enabled version of ArubaOS (6.3.x and above) so that you can have drop broadcasts on, but still use bonjour applications.  Your VLANs are too large and have wired clients, so you have no choice but to have drop broadcasts, or VLAN BCMC optimization on, because broadcasts would degrade your wireless network otherwise.

 

I would wait for 6.3.1.0, which should be coming out soon with some fixes.


I am working with another organization that simply does not understand this at all.... They are a large mac location with over  2500 wired and wireless devices all on a single subnet (that also includes all of their management stuff as well) and they keep complaining about connectivity issues, but just blame the hardware... It really does drive me crazy...


"It works on wired just fine"....

 


Bingo - therefor it must be the wiress network....  I just tell them to replace all their switches with hubs and then get back to me ;)

MVP
Posts: 498
Registered: ‎04-03-2007
Re: Broadcast Multicast ( BCMC ) Bonjour Problem
I'm glad you are acknowledging how large broadcast domains are bad regardless of vendor. I agree. There seems to be a philosophy manifesting inside Aruba that one (or more) large subnets be used for clients and to just let the controller filter things out.
==========
Ryan Holland, ACDX #1 ACMX #1
The Ohio State University
Guru Elite
Posts: 20,795
Registered: ‎03-29-2007
Re: Broadcast Multicast ( BCMC ) Bonjour Problem
[ Edited ]

Ryan wrote:
I'm glad you are acknowledging how large broadcast domains are bad regardless of vendor. I agree. There seems to be a philosophy manifesting inside Aruba that one (or more) large subnets be used for clients and to just let the controller filter things out.

To be clear, large subnets work just fine on an Aruba WLAN if you have broadcast controls in place.  You cannot however expect to not have broadcast filtering in place and have the same performance.  If bonjour applications are required, you run Airgroup.



Colin Joseph
Aruba Customer Engineering

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

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