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Stellar AP | Deployment & Configuration & Troubleshooting Guide

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wlanconfig ath11 list // To list all clients on specific AP interface

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cat /proc/kes_syslog |grep tid

// To check the OS type of the clients on AP

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at /proc/kes_syslog |grep “

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Содержание Stellar AP Series

Страница 1: ...Stellar AP Deployment Configuration Troubleshooting Guide January 2019 ...

Страница 2: ...6 2 2 PRODUCT MATRIX 8 2 3 WORKING MODES 11 3 DEPLOYMENT 13 3 1 AP PLACEMENT GUIDELINES 13 3 1 1 General Recommendations 13 3 1 2 Three Sample Solutions to AP Placement Problems 13 3 1 3 Interferers 15 3 1 4 Channel and Transmission power Considerations 17 3 2 EXPRESS MODE 19 3 3 OV CLOUD MODE 20 3 4 OV ENTERPRISE MODE 21 4 SOFTWARE UPGRADING 23 4 1 UPGRADING IN EXPRESS MODE 23 4 2 UPGRADING IN OV...

Страница 3: ...4 5 4 AP1251 41 4 5 5 AP1201 42 FEATURES AND CONFIGURATIONS 43 4 6 ACS DRM 43 4 6 1 Feature description 43 4 6 2 Configuration and Recommendation 43 4 7 APC 45 4 7 1 Feature description 45 4 7 2 Configuration and Recommendation 46 4 8 LOAD BALANCING 46 4 8 1 Feature description 46 4 8 2 Configuration and Recommendation 47 4 9 BAND STEERING 47 4 9 1 Feature description 47 4 9 2 Configuration and Re...

Страница 4: ...ES TO BE INTRODUCED 48 5 USEFUL CLI COMMANDS 50 5 1 SYSTEM INFORMATION 50 5 2 WIRELESS MANAGEMENT 53 5 3 CLIENT MANAGEMENT 57 5 4 CAPTIVE PORTAL MANAGEMENT 59 5 5 CLUSTER MANAGEMENT 61 5 6 NETWORK MANAGEMENT 62 6 TROUBLESHOOTING 67 6 1 INTRODUCTION OF THE AP LOGS 67 6 1 1 Log files 67 6 1 2 Log level 67 6 1 3 Log collection 67 6 2 TROUBLESHOOTING FOR SPECIFIC FEATURES 后续持续补充 69 6 2 1 AP Reboot 69 ...

Страница 5: ...r with ALE team 2 0 Jan 2019 Update Software Upgrading for AP1201 and useful CLI Commands New creation for log collection and AP reboot log collection method 1 2 Objective The objective of this document is to give a brief introduction of Stellar series solution on the features configurations and troubleshooting in order to help and guide the TSS team to provide better service to the end customers ...

Страница 6: ...ot permitted without written authorization from HAN Networks CLI Command Line Interface DCM Dynamic Client Management DRM Dynamic Radio Management IG Installation Guide MIMO Multiple Input Multiple Output MU MIMO Multi User Multiple Input Multiple Out OVC OmniVista Cirrus OVE OmniVista Enterprise QSG Quick Start Guide WBM Web Based Management ZTP Zero Touch Provision ...

Страница 7: ...Fi to high density client environments in offices hospitals schools retail stores and warehouses Achieve our highest speeds and best performance for your network services and applications Ensure your users have network access anywhere on your campus Main features are Seamless roaming and Quality of Service for real time applications VoWLAN support with QoS for each application Voice Video Collabor...

Страница 8: ...guration Troubleshooting Guide 7 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks Zero touch provisioning ZTP ...

Страница 9: ... radio 802 11ac 2x2 MIMO dual radio 5 GHz 802 11ac 4x4 4 MU MIMO and 2 4 GHz 802 11n 2x2 2 MIMO tri radio dual 5 GHz 802 11ac 4x4 4 MU MIMO and 2 4 GHz 802 11n 4x4 4 MIMO dual radio 5 GHz 802 11ac 2x2 2 MU MIMO and 2 4 GHz 802 11n 2x2 2 MIMO dual radio 5 GHz 802 11ac 2x2 2 MU MIMO and 2 4 GHz 802 11n 2x2 2 MIMO dual radio 5 GHz 802 11ac 2x2 2 MU MIMO and 2 4 GHz 802 11n 2x2 2 MIMO Antennas Built i...

Страница 10: ...full half duplex Ethernet RJ 45 1x 10 100 1000Base T RJ 45 1x USB 2 0 Type A 1x 100 1000 2500Base T RJ 45 1x 10 100 1000Base T 1x BLE radio integrated 2x 10 100 1000Base T RJ 45 4x10 100 1000Base T RJ 45 include 1xPSE 1x USB 2 0 Type A 1x 10 100 1000Base T 1x BLE radio integrated Other Interfaces 1x console port RJ 45 1x console port RJ 45 1x console port RJ 45 1x management console port Micro USB...

Страница 11: ...ployment Configuration Troubleshooting Guide 10 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks ...

Страница 12: ...d and quick deployment Once the first AP is configured using the configuration wizard the remaining APs in the network will come up automatically with an updated configuration This ensures the whole network is up and functional within a few minutes Stellar Series APs also supports secure zero touch provisioning with Alcatel Lucent OXO Connect R2 a mechanism by which all access points in a cluster ...

Страница 13: ...controller less architecture providing user friendly workflows for unified access together with an integrated unified policy authenticati on manager UPAM which helps define authentication strategy and policy enforcement for employees guest management and BYOD devices Stellar Series APs has built in DPI technology providing real time Application Monitoring and enforcement The network administrator ...

Страница 14: ...ides the best coverage Position APs in locations where users are expected to be For example large rooms are typically a better location for APs than a hallway Place APs no more than 40 meters apart from each other Placing APs further apart almost always results in poor coverage Do not mount APs outside buildings Do not mount APs on building perimeter walls unless the operator wants to provide cove...

Страница 15: ...ther side of wall to provide coverage on left side of the wall and the rightmost AP is moved slightly left to provide better coverage to overlap area In the second example there is a large metal wall next to a planned location The figure on the left shows a poor installation of two APs indicated with an X The figure on the right shows a better solution The right most AP is moved to the hallway sli...

Страница 16: ...acement should be chosen in order to minimize interferences on the WLAN system s performance Interferences by WLAN on other technologies is not discussed except cohabitation with DECT APs For more information see Cohabitation with DECT APs Cohabitation with Bluetooth Devices Bluetooth technology is based on frequency hopping over 79 channels in the 2400 to 2483 5 MHz band There are 3 power classes...

Страница 17: ... do not mount an Alcatel Lucent AP within 10 meters of a power class 2 Bluetooth AP o 802 11b g data throughput is reduced when a user is within 10 meters from a class 2 Bluetooth device in use To ensure 80 of the maximum data throughput users should be at least 3 meters away from a Bluetooth class 2 device Power class 3 max transmit power 0 dBm range 10 cm o Not tested interferences should be min...

Страница 18: ...ent APs need to use different radio channels to prevent interference between them The 802 11b g n standard provides for three non interfering channels channels 1 6 and 11 APs within range of each other should always be set to non interfering channels to maximize the capacity and performance of the wireless infrastructure as shown in the diagram below If adjacent APs are set to the same channel or ...

Страница 19: ...This distance assumes that the AP s transmit power is 100 mW For an interfering AP emitting at a different power level the rule is the interferer has to be at such a distance that it should not been seen by the system at more than 40 dBm For voice and data applications in 802 11b g band do not use the same channel for APs placed less than 12 meters from each other This distance assumes that the AP...

Страница 20: ...h radio to 30mW to ensure identical coverage on both radios For mixed 802 11a b g environments where the AP uses all three radios types AP placement should first be determined by modeling for the characteristics of 802 11a since this environment will typically have the shortest range Then the transmission power of the 802 11b and 802 11g radios should be adjusted to provide the required coverage l...

Страница 21: ...the configuration wizard would be displayed on WBM configuration user may follow the wizard to configure the AP For more details please refer to the QSG document of each AP model In case of some abnormal situation below methods could help to make the AP back to factory settings Long pressing the reset button Command firstboot reboot input via Console or SSH connection Click Clear All Configuration...

Страница 22: ... be centralized managed by OmniVista Enterprise Below two methods could be used to switch the AP to OVE mode AP receives option 43 or option 138 from the DHCP server specifying the OmniVista IP the AP will boot up and connect to OmniVista 2500 for management AP in Express mode could be switched to OVE mode through Web Based Management as below o Login AP WBM go to AP Configuration and click Conver...

Страница 23: ...22 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks For more details please refer to the related guides or documents of OmniVista Enterprise ...

Страница 24: ...anaged from the Web Based Management The software upgrading could be managed either in the whole cluster or per single AP While to avoid any incompatibility issue strongly recommend to keep all the APs within the whole cluster in the same software versions Procedures of AP upgrading in the whole cluster Login AP WBM go to AP Configuration and click Upgrade All Firmware button Click the AP modes ne...

Страница 25: ...authorization from HAN Networks Procedures of Single AP Software Upgrading Login AP Cluster WBM go to AP Configuration and Select the IP address of AP which need to be upgraded A new WBM page apui will be opened Click Image File from System and select the AP software according to the AP model Press Upload button to start the upgrading Importance Don t turn off the power during the upgrade process ...

Страница 26: ...nagement server Single or all APs could be upgraded as requested Note From AWOS 3 0 4 x and later releases the AP upgrading will be started in 30 minutes Regarding the previous releases AWOS 3 0 3 x manual restart of the AP would be required to trigger the upgrading Procedures of the upgrading in OVC mode Upgrade when registering a new AP to OV Cloud Log in OV cloud enter the Network inventory dev...

Страница 27: ...t use and communication of its contents not permitted without written authorization from HAN Networks AP will be registered to OV cloud after upgrading to the selected version Upgrade for one registered AP Go to the Network inventory device Catalog page select the AP need to be upgraded and click the Set Software Version button ...

Страница 28: ... permitted without written authorization from HAN Networks Select the version you want to upgrade in Desired Software Version and click apply The AP will start to upgrade when the next callhome is sent Upgrade for multiple registered AP Go to the Network inventory device Catalog page select multiple or all AP need to be upgraded and click the Set Software Version button ...

Страница 29: ...on to be upgraded in the Desired Software Version drop down box and click apply The APs will start to upgrade when the next callhome is sent 4 3 Upgrading in OV Enterprise mode When working in OVE OmniVista Enterprise mode the AP software could be centralized managed through OVE management server Single or all APs could be upgraded as requested Note Reboot of the AP is mandatory during the AP upgr...

Страница 30: ...tion of its contents not permitted without written authorization from HAN Networks Log in OV Enterprise enter the Configuration Resource Manager Upgrade Image page click import to upload the AP software version to be upgraded After uploading the AP software version select the file and click the install button and then go to devices selection step ...

Страница 31: ...f its contents not permitted without written authorization from HAN Networks Upgrade per AP APs Click the next to open the device selection window Click the ADD button of device and use Use Picker or Use Topology App to select the AP to be upgraded In the Use Picker page select the AP and click the add button to add to the selected window then click OK ...

Страница 32: ...ommunication of its contents not permitted without written authorization from HAN Networks In the Use Topology App page select the AP need to be upgraded and click OK Upgrade per AP Group In the device selection window click the ADD button of AP Groups go to the group selection window Select AP Groups and click the Add button and click OK ...

Страница 33: ...Guide 32 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks After selecting the AP click the Next to enter the Software Installation page ...

Страница 34: ... document use and communication of its contents not permitted without written authorization from HAN Networks Click the install software button to enter the upgrade page Note To avoid incompatibility issues suggest keeping the same AP software version in the AP group So it s better to use AP Group when upgrading the APs ...

Страница 35: ... enter the bootloader it will need to connect the console port and open the console session During the AP initialization pressing any key when below words showing on the screen of console 4 4 2 AP1101 Procedure of the upgrading AP1101 through bootloader To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1101 UBOOT_KERNEL_3 0 x x bin OAW AP1101 UBOOT_ROOTFS_3 0 x x bin ...

Страница 36: ...f1d0000 0xc20000 cp b 0x80060000 0x9f1d0000 0xc20000 run lk aos run lf aos reset 4 4 3 AP1220 Series Procedure of the upgrading AP1220 Series through bootloader To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1220 UBOOT_FIRMWARE_3 0 x x bin To enter the bootloader during AP initialization which is described in 4 4 1 Network configuration IP Address TFTP Server Addre...

Страница 37: ...230 Series one is Gigabit Ethernet port another one is 2 5 Gigabit Ethernet port We MUST use the Gigabit Ethernet port for both upgrading AP through bootloader and upgrading UBoot version Procedure of the upgrading AP1230 through bootloader To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1230 UBOOT_FIRMWARE_3 0 x x bin To enter the bootloader during AP initializatio...

Страница 38: ... md5sum 0x43000000 filesize nand read 0x44000000 0x3000000 filesize md5sum 0x44000000 filesize reset After AP reboot entering below commands to make dual system working fm_switch reboot 4 4 5 AP1251 Procedure of the upgrading AP1250 Series through bootloader To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1250 UBOOT_FIRMWARE_3 0 x x bin To enter the bootloader durin...

Страница 39: ...0x0 filesize md5sum 0x85000000 filesize nand read 0x83000000 0x03000000 filesize md5sum 0x83000000 filesize reset After AP reboot entering below commands to make dual system working fm_switch reboot 4 4 6 AP1201 Procedure of the upgrading AP1201 Series through bootloader To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1201 UBOOT_FIRMWARE_3 0 x x bin Network configur...

Страница 40: ...ize md5sum 0x83000000 filesize reset 4 5 Upgrading UBoot Normally it s NOT necessary to upgrade UBoot software of APs While in some very special cases the new UBoot software version maybe needed to solve some issues This chapter describes the procedure of the UBoot upgrading for different AP models 4 5 1 AP1101 Procedure of UBoot upgrading To setup a TFTP server on a PC and put the images on the T...

Страница 41: ...ath OAW AP1220 uboot_1 x bin To enter the bootloader during AP initialization which is described in 4 4 1 Network configuration IP Address TFTP Server Address Example IP address 172 16 18 11 TFTP Server Address 172 16 18 129 set ipaddr 172 16 18 11 set serverip 172 16 18 129 UBoot Upgrading tftpboot 0x84000000 OAW AP1220 uboot_1 x bin imgaddr 0x84000000 source imgaddr script reset 4 5 3 AP1230 Ser...

Страница 42: ...72 16 18 129 save UBoot Upgrading tftpboot 0x42000000 OAW AP1230 uboot_1 x bin imgaddr 0x42000000 sf probe source imgaddr script reset 4 5 4 AP1251 Procedure of UBoot upgrading To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1250 uboot_1 x bin To enter the bootloader during AP initialization which is described in 4 4 1 Network configuration IP Address TFTP Server Ad...

Страница 43: ...addr script reset 4 5 5 AP1201 Procedure of UBoot upgrading To setup a TFTP server on a PC and put the images on the TFTP server path OAW AP1201 uboot_1 x bin To enter the bootloader during AP initialization which is described in 4 4 1 Example IP address 172 16 18 11 TFTP Server Address 172 16 18 129 set ipaddr 172 16 18 11 set serverip 172 16 18 129 UBoot Upgrading tftpboot 0x84000000 OAW AP1201 ...

Страница 44: ...annels to maximize the capacity and performance of the wireless infrastructure Please check chapter 3 1 3 for more detail To avoid mutual interference with adjacent APs ACS auto channel selection could be used to make the AP to check and select a best channel under the radio environment automatically The algorithm will help the AP to find the channel with best radio performance And if working on 5...

Страница 45: ...eshooting Guide 44 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks The ACS could be turn ON OFF separately on 2 4GHz or 5GHz ...

Страница 46: ...ed without written authorization from HAN Networks On 5GHz radio the DRM could be configured 4 7 APC 4 7 1 Feature description In order to have a better radio coverage and less mutual interference between the adjacent APs APC Auto Power Control could be used to make the AP to scan the other APs transmission power and then to calculate and control its owner RF transmission power ...

Страница 47: ...rks 4 7 2 Configuration and Recommendation APC configuration is similar to ACS which has been described in 5 1 2 APC could be turned ON OFF separately on 2 4GHz or 5GHz as below 4 8 Load Balancing 4 8 1 Feature description Load balancing is used to make the wireless clients could be associated to the AP with good performance by checking the number clients associated and uplink RSSI info synchroniz...

Страница 48: ...The load balancing could be activated from WEB UI Wireless page as below 4 9 Band Steering 4 9 1 Feature description Dual band devices could be associated with the AP either in 2 4GHz or 5GHz Band Steering feature is able to help this kind of devices to be associated on a better radio band which is based on RSSI in 5GHz radio RF utilization of the channel of each radio band Number of stations on t...

Страница 49: ...ted without written authorization from HAN Networks 4 9 2 Configuration and Recommendation The load balancing could be activated from WEB UI Wireless page as below 4 10 Background scanning 4 10 1 Feature description 4 10 2 Configuration and Recommendation 4 11 Voice over WLAN 4 11 1 Feature description 4 11 2 Configuration and Recommendation 4 12 More features to be introduced ...

Страница 50: ...ployment Configuration Troubleshooting Guide 49 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks ...

Страница 51: ...ontents not permitted without written authorization from HAN Networks 5 Useful CLI Commands 5 1 System information Free To check the memory usage Example Showsysinfo To check the AP hardware information Example ps grep process To check the status of the related software process Example ps grep D To check if there s any software process in D dead state Example ...

Страница 52: ...munication of its contents not permitted without written authorization from HAN Networks uptime To check the AP run time Example date To check AP system date and time Example ssudo passwd To modify the password of support account Example showver To check AP firmware version Example reset_reason get To check the recent reset reasons Example ...

Страница 53: ...ts contents not permitted without written authorization from HAN Networks ssudo firstboot To clear all the settings and reset to factory Example ssudo reboot To reboot the AP device Example iwpriv wifi0 getCountry To check the Country Code of the AP Example cat proc kes_syslog To check the system log and filter could be used for specific requests Example ...

Страница 54: ...ed Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks 5 2 Wireless Management Iwconfig To check the wireless configuration Example cat etc config wireless To check the wireless configuration Example ...

Страница 55: ...ting Guide 54 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks cat tmp config rfprofile conf To check the RF configuration Example ...

Страница 56: ...of this document use and communication of its contents not permitted without written authorization from HAN Networks iwlist ath01 channel To check the cannel of ath01 interface The same for other interfaces Example iwlist ath01 txpower To check the txpower of ath01 interface The same for other interfaces Example ...

Страница 57: ... ath01 bitrate To check the bit rate of ath01 interface The same for other interfaces Example iwpriv ath01 get_mode To check the interface mode of ath01 The same for other interfaces Example iwpriv wifi0 get_txchainmask or iwpriv wifi1 get_txchainmask To check the spatial streams quantity supported by the Steller AP Example telnet 127 0 0 1 7787 then stadb and s To check the clients supported band...

Страница 58: ...ument use and communication of its contents not permitted without written authorization from HAN Networks Press ctrl d to exit cat proc kes_syslog grep DRM To check the logs of ACS and APC management Example 5 3 Client Management ssudo sta_list To list all the clients associated with this AP ssudo wam_debug sta_list Example ...

Страница 59: ...e and communication of its contents not permitted without written authorization from HAN Networks wlanconfig ath11 list To list all clients on specific AP interface Example cat proc kes_syslog grep tid To check the OS type of the clients on AP Example cat proc kes_syslog grep MAC To check the access logs of specific client Example ...

Страница 60: ...opying of this document use and communication of its contents not permitted without written authorization from HAN Networks 5 4 Captive Portal Management ps grep eag To check if the thread of eag is running well Example eag_cli show user all list To list the clients authenticated by captive portal Example ...

Страница 61: ...is document use and communication of its contents not permitted without written authorization from HAN Networks eag_cli kick user index 1 To delete a user from Portal authenticated user list Example tail f tmp log eag log cat proc kes_syslog grep eag cat var log eag log To check the related logs of push portal Example ...

Страница 62: ...ment use and communication of its contents not permitted without written authorization from HAN Networks 5 5 Cluster Management cluster_mgt x show self To check the AP Cluster role and status Example cluster_mgt x show pvc To check the PVC of the cluster Example show_cluster To check all the AP members in the cluster Example ...

Страница 63: ... from HAN Networks show_cluster wc l To check the AP numbers in the cluster Example The AP numbers is the output value minus one ps grep cluster To check if cluster process is working normally Example Two cluster_mgt thread existing indicates abnormal behavior as below example 5 6 Network Management cat etc resolv conf To check the DNS server information Example cat tmp TZ To check the Timezone co...

Страница 64: ... document use and communication of its contents not permitted without written authorization from HAN Networks Example cat proc kes_syslog grep ntp To check the NTP logs Example cat etc config rogueap To check the Rogue AP configuration cat tmp config wids conf Example ps grep light To check if the WBM service is running ...

Страница 65: ...cument use and communication of its contents not permitted without written authorization from HAN Networks Example cat etc cert serial To check the serial of the certificate Example ifconfig br wan To check the IP address configuration of AP ssudo ifconfig br wan Example ssudo ping To check the network connectivity Example ...

Страница 66: ...sing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks ssudo traceroute To check the network trace route Example ssudo tcpdump To capture the packets from br wan interface tftp To transfer files via TFTP Example ...

Страница 67: ...ployment Configuration Troubleshooting Guide 66 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks ...

Страница 68: ...e AP Logs 6 1 1 Log files 6 1 2 Log level 6 1 3 Log collection 6 1 3 1 For R3 0 3 Build To setup a TFTP server on a PC and put the script take_snapshot_v1 4 sh on the TFTP server path Example TFTP Server Address 172 16 18 166 Log collection through the root account root AP D1 40 root AP D1 40 cd tmp root AP D1 40 tmp tftp gr take_snapshot_v1 4 sh 172 16 18 166 root AP D1 40 tmp chmod x take_snapsh...

Страница 69: ...ntents not permitted without written authorization from HAN Networks 6 1 3 2 For R3 0 4 Build There are two methods to collect the logs A Use the script take_snapshot_v1 4 sh the same as R3 0 3 Build B Use the GUI Tools For Express mode refer to below screenshot For Enterprise mode it supports in R3 0 4MR2 or later build see below screeshot Enable AP Web first ...

Страница 70: ... get_log_v1 4 sh together as below root AP D1 40 tmp tftp gr take_snapshot_v1 4 sh 172 16 18 166 root AP D1 40 tmp mv take_snapshot_v1 4 sh usr bin root AP D1 40 tmp tftp gr get_log_v1 4 sh 172 16 18 166 root AP D1 40 tmp chmod x usr bin take_snapshot_v1 4 sh root AP D1 40 tmp chmod x get_log_v1 4 sh root AP D1 40 tmp sh get_log_v1 4 sh 172 16 18 166 Note when finish the log collection please firs...

Страница 71: ...mp support AP CA 70 tmp support AP CA 70 tmp reset_reason get support AP CA 70 tmp tftp pl kes_debug log 172 16 18 166 support AP CA 70 tmp tftp pl kes_dmsg log 172 16 18 166 support AP CA 70 tmp tftp pl kes_history_syslog log 172 16 18 166 support AP CA 70 tmp tftp pl kes_history_traps log 172 16 18 166 6 2 2 Band steering Related log description How to capture this trace Necessary analysis 6 2 3...

Страница 72: ... Configuration Troubleshooting Guide 71 P a g e All rights reserved Passing on and copying of this document use and communication of its contents not permitted without written authorization from HAN Networks END OF DOCUMENT ...

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