Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

80 Mhz Channel Bonding

Hi All,

What will happen to 802.11n client, when i do channel bonding to 80 Mhz for 802.11ac client..?


80 Mhz Channel Bonding

There are protection mechanisms in place, like there are between 802.11a/g and n.  legacy clients will only see the center channel and the amount of bondin that they support.


Please remember to rate useful posts, and mark questions as answered

HTH, Steve ------------------------------------------------------------------------------------------------ Please remember to rate useful posts, and mark questions as answered
VIP Purple

80 Mhz Channel Bonding

May be this is you wnated to know or ???

802.11ac is backward compatible with 802.11n and 11a, and operates in a mixed mode supporting 802.11a/n/ac clients in the 5GHz band. So your 802.11ac APs can transmit to 802.11ac clients on 80MHz channels, 802.11n clients on 20/40MHz channels, and 802.11a clients on 20MHz channels. However, falling back to 20/40MHz channels will impact performance for 802.11ac clients, so it is important to assign channels in your environment to balance performance among your specific client base.

802.11ac, when it arrives, has a few new effects on existing 802.11a/11n deployments even if the deployment is not upgraded to 802.11ac immediately: (1) the wider channel bandwidths of neighboring APs require updates to radio resource measurement, or RRM (and in particular the dynamic channel assignment algorithm), and (2) 802.11a/11n wireless intrusion protection systems (WIPS) can continue to decode most managements frames such as beacon and probe request/response frames (that are invariably sent in 802.11a format) but do not have visibility in data sent in the new 802.11ac packet format.

Hope it helps.


Dont forget to rate helpful posts

New Member

80 Mhz Channel Bonding

Hi Sandeep,

Thanks for the explanation. So WIPS(monitor mode ap) will not scan in 802.11ac?? Coz i have enabled monitor mode for some ap's in my network , but 802.11ac radio goes down immd.

Thanks in advance

Hall of Fame Super Gold

80 Mhz Channel Bonding

802.11ac is backward compatible with 802.11 a/b/g/n.

One of the biggest issue with implementing 802.11ac is the amount of non-overlapping channels.  Since 802.11ac works only with 802.11a radio, the number of non-overlapping channels drop to four.  If you have a dense deployment of AP this will be a significant challenge. 

Be aware that some wireless clients advertise themselves as "802.11ac ready" but these clients will NEVER be able to push at 802.11ac.  A good example is Samsung's Galaxy.  How do you expect this model to push 802.11ac speed with only one radio? 

Hall of Fame Super Silver

Re: 80 Mhz Channel Bonding

When an AP scans, it scans all channels, so it does this one channel at a time. Doesn't matter if it's 20mhz, 40mhz or 80mhz. The AP scans a single 20mhz channel.

Sent from Cisco Technical Support iPhone App

*** Please rate helpful posts ***
CreatePlease login to create content