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Prefer-mode allows an administrator to configure CAPWAP L3 transport (IPv4 and IPv6) through which access points join the WLC (based on its primary/secondary/tertiary configuration).
PnP solution provides staging parameters to the AP before it joins a WLC. Using this staging configuration, the AP gets the runtime configuration when it joins the WLC. PnP is supported only on AP recovery images and activated for the zero-day deployment alone. PnP is not initiated after the AP connects to the WLC for the first time.
The following AP scenario is supported:
AP-Group specific prefer-mode is pushed to an AP only when the prefer-mode of AP-Group is configured and the AP belongs to that group.
Global prefer-mode is pushed to default-group APs and to those AP-Groups on which the prefer-mode is not configured.
By-default, values of prefer-mode for AP-Group and Global is set to un-configured and IPv4 respectively.
If an AP, with an configured prefer-mode, tries to join the controller and fails, then it will fall back to choose AP-manager of the other transport and joins the same controller. When both transports fail, AP will move to next discovery response.
In such a scenario, Static IP configuration will take precedence over prefer mode. For example:
The controllers CLI provides an XML support of prefer-mode.
Step 1 | Use this command to configure prefer-mode of AP-Group and all APs. Global prefer-mode will not be applied on APs whose AP-Group prefer-mode is already configured. On successful configuration, the AP will restart CAPWAP and join with the configured prefer-mode after choosing a controller based on its primary/secondary/tertiary configuration. config ap preferred-mode {IPv4|IPv6}{ <apgroup>|<all>} | ||
Step 2 | Use this command
to disable (un-configure) the prefer-mode on the AP.
config ap preferred-mode disable
<apgroup>
| ||
Step 3 | Use this command to view the statistics for prefer-mode configuration. The statistics are not cumulative but will be updated for last executed configuration CLI of prefer-mode. show ap prefer-mode stats | ||
Step 4 | Use this command to view the prefer-mode configured for all AP-Groups. show wlan apgroups | ||
Step 5 | Use this command to view the global prefer-mode configured. show network summary | ||
Step 6 | Use this command
to view to check if the prefer mode command is pushed to an AP from global
configuration or from an AP-Group specific configuration.
show ap config general <Cisco AP>
(Cisco Controller) >show ap config general AP-3702E Cisco AP Identifier.............................. 2 Cisco AP Name.................................... AP-3702E Country code..................................... US - United States Regulatory Domain allowed by Country............. 802.11bg:-A 802.11a:-A AP Country code.................................. US - United States AP Regulatory Domain............................. 802.11bg:-A 802.11a:-A Switch Port Number .............................. 1 MAC Address...................................... bc:16:65:09:4e:fc IPv6 Address Configuration....................... SLAAC IPv6 Address..................................... 2001:9:2:35:be16:65ff:fe09:4efc IPv6 Prefix Length............................... 64 Gateway IPv6 Addr................................ fe80::a2cf:5bff:fe51:c4ce NAT External IP Address.......................... None CAPWAP Path MTU.................................. 1473 Telnet State..................................... Globally Enabled Ssh State........................................ Globally Enabled Cisco AP Location................................ default location Cisco AP Floor Label............................. 0 Cisco AP Group Name.............................. default-group Primary Cisco Switch Name........................ amb Primary Cisco Switch IP Address.................. 9.2.35.25 ..................................... ..................................... ..................................... ..................................... ..................................... Ethernet Port Speed.............................. Auto AP Link Latency.................................. Disabled Rogue Detection.................................. Enabled AP TCP MSS Adjust................................ Disabled IPv6 Capwap UDP Lite............................. Enabled Capwap Prefer Mode............................... Ipv6 (Global Config) Hotspot Venue Group.............................. Unspecified Hotspot Venue Type............................... Unspecified DNS server IP ............................. Not Available
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