Point-to-Point and Point-to-Multipoint link testing I'm doing some work again in wireless bridging and thought I'd document some of the configs and commmands used when testing connectivity. To test channel capacity and determine how noisy the available channels are in your area, you can perform a Carry Busy test. You probably want to test on both radios, since they will likely "see" different channel utilizations on each end of your link. *Note: Do not do this outside of a maintenance window, as it will drop the bridge during the test! Cisco_Bridge#dot11 dot11Radio 0 carrier busy Cisco_Bridge# Frequency Carrier Busy % --------- -------------- 2412 22 2417 26 2422 16 2427 16 2432 20 2437 21 2442 16 2447 19 2452 11 2457 15 2462 9 Cisco_Bridge# Another useful command is to test the data rates the bridges are connected at. This will give you an idea of the quality of the wireless link and what speeds you can expect across it. The example below is on an a pair of old Cisco 1310 802.11g bridges, so they'll max out at 54Mb. Results of the test are shown automatically after the test completes. Although this does not take the wireless link down during the test, it does flood the link and will impact any other traffic crossing at the time, so use caution. Cisco_Bridge#dot11 dot11Radio 0 linktest ? all-rates Test all rates count Packet count per test interval Interval between continuous tests packet-size Packet size rate Set test bit rate short-gi Use short guard interval target target MAC Address width-20 20 Mhz mode rate width-40 40 Mhz mode rate window Outstanding packet window <cr> Cisco_Bridge#dot11 dot11Radio 0 linktest packet-size 1500 count 9999 Start linktest to 0014.69f9.3072, 9999 1500 byte packets Cisco_Bridge# GOOD (0 % retries) Time Strength(dBm) SNR SNR Retries msec In Out In Out In Out Sent :9999, Avg 2 - 36 - 37 56 58 Tot: 49 121 Lost to Tgt: 0, Max 29 0 - 5 243 169 Max: 6 3 Lost to Src: 0, Min 1 -255 - 76 5 19
Want to know who is connected to your bridge or see if the link is up? Use the following command: Cisco_Bridge#sho dot11 associations 802.11 Client Stations on Dot11Radio0: SSID [MY_WiFI_Bridge] : MAC Address IP address Device Name Parent State 0014.69f9.3072 10.16.11.248 WGB MY_Remote_Br self Assoc 18a9.05d6.3f7e 10.16.11.249 WGB-client - 0014.69f9.3072 Assoc Cisco_Bridge# You can also use the "show dot11 assoc all-client" to view details like IP address, link uptime, Signal Strenght and SNR, etc...