I'm trying to configure two Aironet 2602e (with external antennas) to form a bridge between two buildings. I can't figure out how to get them to run faster than 54 Mbit between them. Currently they just sit at my desk in a test-setup. I think, I should maybe set them up as Workgroup-bridges instead of root-to-non-root, but I don't get other speed options than those 54 Mbit. Also I think it should be done at 5 GHz radio.
Could it be something with encryption mode or is it only possible through CLI or...
Yes, If you want to get 802.11n speed, you have to configure either Open Authentication or WPA2/AES. post your show run config to see what you have configured & why you are not getting 802.11n data rates ?
**** Pls rate all useful responses ***
That was a fast response!
My config (too much of it??):
dot11 syslog ! dot11 ssid Gangbro3 authentication open authentication key-management wpa version 2 wpa-psk ascii 7 0100525750585400751842594900 ! ! crypto pki token default removal timeout 0 ! ! username administrator privilege 15 password xxxxxxxxxxxxxxxx ! ! bridge irb ! ! ! interface Dot11Radio0 no ip address no ip route-cache shutdown ! encryption mode ciphers aes-ccm antenna gain 0 speed basic-1.0 basic-2.0 basic-5.5 basic-11.0 basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15. m16. m17. m18. m19. m20. m21. m22. m23. station-role root access-point bridge-group 1 bridge-group 1 subscriber-loop-control bridge-group 1 spanning-disabled bridge-group 1 block-unknown-source no bridge-group 1 source-learning no bridge-group 1 unicast-flooding ! interface Dot11Radio1 no ip address no ip route-cache ! encryption mode ciphers aes-ccm ! ssid Gangbro3 ! antenna gain 0 no dfs band block stbc speed basic-6.0 basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15. m16. m17. m18. m19. m20. m21. m22. m23. channel dfs station-role root bridge bridge-group 1 bridge-group 1 spanning-disabled ! interface GigabitEthernet0 no ip address no ip route-cache duplex auto speed auto bridge-group 1 bridge-group 1 spanning-disabled ! interface BVI1 ip address dhcp client-id GigabitEthernet0 no ip route-cache ! ip forward-protocol nd ip http server ip http authentication aaa no ip http secure-server ip http help-path http://www.cisco.com/warp/public/779/smbiz/prodconfig/help/eag ! ! bridge 1 route ip ! ! ! line con 0 line vty 0 4 transport input all ! end
It's good you have configured WPA2/AES. Once your non-root bridge associated to your root-bridge get the following output from your root-bridge. This will help to verify the associated data rate.
show dot11 associations all-client
*** Pls rate all useful responses ***
Thanks - I will try that at work tomorrow.
Is there any good reason, that I cannot choose more than 54 Mbit in the GUI on the AP? Will the AP's automatically connect at higher speeds if possible?
Not too sure about GUI as I always use CLI for configuration
As long as you configure the correct settings to support MCS data rates (ie WPA2/AES or Open Auth) & two APs hear each other with strong signal automatically they should go for 802.11n data rates.
To limit the bridge associate in certain data rates you can configure required speeds under radio interface. For example if you configure interface d1 like below, then it should not go below 54Mbps (but you need to ensure they hear each other with required dBm to maintain such data rates)
speed basic-54.0 m0. m1. m2. m3. m4. m5. m6. m7. m8. m9. m10. m11. m12. m13. m14. m15.
Below 2600 datasheet should provide you information about receiver sensitivity to maintain such data rates
Below table should provide you the achievalble data rates under specific condition in different type of AP models.
*** Pls rate all useful responses ***
Thanks again, Rasika - so many usefull answers.
I've had some succes by now - the two bridges connect with m23, apparantly, which gives me about 90-100 Mbit in a controll-file-transfer between the two AP's sitting on my desk.
I have 4 external antennas and I think, it should be possible to achieve more speed - could it be some fidling with "streams" (new to me). Or should I use both 2.4 GHz and 5 GHz? Currently I only use 5 GHz.
Glad to see it is associated m23 rate which is maximum you can get.
Regarding to higher throughput, you can use channel bonding in 5GHz to have more bandwidth. Configure this on radio 1 interface of both AP & see.
AAP(config-if)#channel width ?
20 20 Mhz width
40-above 40 Mhz width with extension channel above
40-below 40 Mhz width with extension channel below
AAP(config-if)# channel width 40-above
Guard interval should be by default "any" & it should allow you to go with "short guard interval" to give you maximum throughput. Two otptions available are as below.
any allow either short or long guard interval
long allow only long guard interval
**** Pls rate all useful responses ****
Hi Rasika -
On my root-AP I can issue the channel-command but on the non-root it doesn't recognize "channel"
% Unrecognized command
There seems to be endless questions to ask
Even if you could not configure it on non-root bridge, as long as you have it on root bridge, association should be on 40MHz. Did you do the file transfer test after change it on root-ap end ?
Let us know
Yes - The association happened, but the non-root kept showing 20 MHz and I couldn't transfer a file with more than 0.6 MByte pr. sec. I changed root-AP back to 20 MHz and it went back to normal (which is approx 50 Mbit/s - the AP's are now positioned on the two buildings with approx 50 meter between them)
Maybe the distance is too much for higher rates?
Nicholas (And again: Thank you so much for all those usefull and rapid responses!)
Hi again -
Now it works with the commands you gave - I gave the non-root a little time to adjust to the root, which had 40-above, and the non-root adjusted to 40 MHz. Super.
Now I'm in doubt if I'm getting enough out of my MIMO-antenna - is the AP self-configuring the antenna?
AIR-ANT2566P4W-R 2.4-GHz/5-GHz MIMO 4-Element Patch Antenna, by the way.
Again, should I use both frequencies maybe?
You cannot used both band to establish bridge at the same time. So it will be either 2.4GH or 5 GHz (but you can keep the configuration in case one failed, it will use the other band)
As you can see, performance wise you can get better throughput if you go with 5GHz (as channel bonding is not for 2.4GHz) due to limited channels. Also in 5GHz you should have less interference. I would choose 2.4 GHz over 5GHz only if I want to go distance & 5GHz is not capable of such distance. Since your two buildings are closeby, working on 5GHz will be the better option if you looking for throughput.
Regarding Antenna, by default "diversity" is enable. So you do not want to do any other optimization as far as I know.
Thanks for taking time to rating our responses.
*** Pls rate all useful responses ***
To get the higher speed.. you will have to select only those speed at which you want your bridge to be connected..
but it happens sometimes due to signal issue that connectivity reduces at the lower speed but at that time if some lower speed is also not selected then possibly there will be a connectivity disconnection between root and nn root bridge and you will be loosing the connection completely.
Also Antennae should be pointed directly towards each other for bettwer connectivity... :-)
Also you can connect your root and non root with any one radio and can connect your clients with another radio.. not posible to use both radio for root and non root coonectivity at the same time..
Kindly find the link below to increase to the bandwidth of the ap.
Access points running recent Cisco IOS versions are transmitting multicast and management frames at the highest configured basic rate, and is a situation that could causes reliability problems.
Access points running LWAPP or autonomous IOS should transmit multicast and management frames at the lowest configured basic rate. This is necessary in order to provide for good coverage at the cell's edge, especially for unacknowledged multicast transmissions where multicast wireless transmissions may fail to be received.
Since multicast frames are not retransmitted at the MAC layer, stations at the edge of the cell may fail to receive them successfully. If reliable reception is a goal, then multicasts should be transmitted at a low data rate. If support for high data rate multicasts is required, then it may be useful to shrink the cell size and to disable all lower data rates.
Depending on your specific requirements, you can take the following action:
•If you need to transmit the multicast data with the greatest reliability and if there is no need for great multicast bandwidth, then configure a single basic rate, one that is low enough to reach the edges of the wireless cells.
•If you need to transmit the multicast data at a certain data rate in order to achieve a certain throughput, then configure that rate as the highest basic rate. You can also set a lower basic rate for coverage of non-multicast clients.