Configuring FlexConnect Groups

Configuring FlexConnect Groups
Configuring FlexConnect Groups
• Information About FlexConnect Groups, page 1
• Configuring FlexConnect Groups, page 5
• Configuring VLAN-ACL Mapping on FlexConnect Groups, page 10
• Configuring WLAN-VLAN Mappings on FlexConnect Groups, page 11
Information About FlexConnect Groups
To organize and manage your FlexConnect access points, you can create FlexConnect Groups and assign
specific access points to them.
All of the FlexConnect access points in a group share the same backup RADIUS server, CCKM, and local
authentication configuration information. This feature is helpful if you have multiple FlexConnect access
points in a remote office or on the floor of a building and you want to configure them all at once. For example,
you can configure a backup RADIUS server for a FlexConnect rather than having to configure the same server
on each access point.
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Configuring FlexConnect Groups
FlexConnect Groups and Backup RADIUS Servers
The following figure shows a typical FlexConnect deployment with a backup RADIUS server in the branch
office.
Figure 1: FlexConnect Group Deployment
FlexConnect Groups and Backup RADIUS Servers
You can configure the controller to allow a FlexConnect access point in standalone mode to perform full
802.1X authentication to a backup RADIUS server. You can configure a primary backup RADIUS server or
both a primary and secondary backup RADIUS server. These servers can be used when the FlexConnect
access point is in of these two modes: standalone or connected.
FlexConnect Groups and CCKM
FlexConnect Groups are required for CCKM fast roaming to work with FlexConnect access points. CCKM
fast roaming is achieved by caching a derivative of the master key from a full EAP authentication so that a
simple and secure key exchange can occur when a wireless client roams to a different access point. This feature
prevents the need to perform a full RADIUS EAP authentication as the client roams from one access point to
another. The FlexConnect access points need to obtain the CCKM cache information for all the clients that
might associate so they can process it quickly instead of sending it back to the controller. If, for example, you
have a controller with 300 access points and 100 clients that might associate, sending the CCKM cache for
all 100 clients is not practical. If you create a FlexConnect that includes a limited number of access points
(for example, you create a group for four access points in a remote office), the clients roam only among those
four access points, and the CCKM cache is distributed among those four access points only when the clients
associate to one of them.
Note
CCKM fast roaming among FlexConnect and non-FlexConnect access points is not supported.
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Configuring FlexConnect Groups
FlexConnect Groups and Opportunistic Key Caching
Note
FlexConnect Groups is needed for CCKM to work. Flex group needs to be created for CCKM, 11r , and
OKC , only then the caching can happen on an AP. The group name must be same between APS for a fast
roaming to happen for 11r/CCKM. The group can be different for OKC as final check is done at Cisco
WLC.
FlexConnect Groups and Opportunistic Key Caching
Starting with the Cisco Wireless LAN Controller Release 7.0.116.0, FlexConnect groups accelerate
Opportunistic Key Caching (OKC) to enable fast roaming of clients. OKC facilitates fast roaming by using
PMK caching in access points that are in the same FlexConnect group.
OKC prevents the need to perform a full authentication as the client roams from one access point to another.
FlexConnect groups store the cached key on the APs of the same group, accelerating the process. However,
they are not required, as OKC will still happen between access points belonging to different FlexConnect
groups and will use the cached key present on the Cisco WLC, provided that Cisco WLC is reachable and
APs are in connected mode.
To see the PMK cache entries at the FlexConnect access point, use the show capwap reap pmk command.
This feature is supported on Cisco FlexConnect access points only. The PMK cache entries cannot be viewed
on Non-FlexConnect access points.
Note
The FlexConnect access point must be in connected mode when the PMK is derived during WPA2/802.1x
authentication.
When using FlexConnect groups for OKC or CCKM, the PMK-cache is shared only across the access points
that are part of the same FlexConnect group and are associated to the same controller. If the access points are
in the same FlexConnect group but are associated to different controllers that are part of the same mobility
group, the PMK cache is not updated and CCKM roaming will fail but OKC roaming will still work.
Note
Fast roaming works only if the APs are in the same FlexConnect group for APs in FlexConnect mode,
802.11r .
FlexConnect Groups and Local Authentication
You can configure the controller to allow a FlexConnect access point in standalone mode to perform LEAP,
EAP-FAST, PEAP, or EAP-TLS authentication for up to 100 statically configured users. The controller sends
the static list of usernames and passwords to each FlexConnect access point when it joins the controller. Each
access point in the group authenticates only its own associated clients.
This feature is ideal for customers who are migrating from an autonomous access point network to a lightweight
FlexConnect access point network and are not interested in maintaining a large user database or adding another
hardware device to replace the RADIUS server functionality available in the autonomous access point.
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Configuring FlexConnect Groups
FlexConnect Groups and VLAN Support
Note
• You can configure LEAP, EAP-FAST, PEAP, or EAP-TLS authentication only if AP local
authentication is enabled.
You have to provision a certificate to the AP because the AP has to send the certificate to the client. You must
download the Vendor Device Certificate and the Vendor Certification Authority Certificate to the controller.
The controller then pushes these certificates to the AP. If you do not configure a Vendor Device Certificate
and the Vendor CA Certificate on the controller, the APs associating with the FlexConnect group download
the self-signed certificate of the controller, which may not be recognized by many wireless clients.
With EAP-TLS, AP does not recognize and accept client certificate if the client root CA is different from the
AP root CA. When you use Enterprise public key infrastructures (PKI), you must download a Vendor Device
Certificate and Vendor CA Certificate to the controller so that the controller can push the certificates to the
AP in the FlexConnect group. Without a common client and AP root CA, EAP-TLS fails on the local AP.
The AP cannot check an external CA and relies on its own CA chain for client certificate validation.
The space on the AP for the local certificate and the CA certificate is around 7 Kb, which means that only
short chains are adapted. Longer chains or multiple chains are not supported.
Note
This feature can be used with the FlexConnect backup RADIUS server feature. If a FlexConnect is
configured with both a backup RADIUS server and local authentication, the FlexConnect access point
always attempts to authenticate clients using the primary backup RADIUS server first, followed by the
secondary backup RADIUS server (if the primary is not reachable), and finally the FlexConnect access
point itself (if the primary and secondary are not reachable).
For information about the number of FlexConnect groups and access point support for a Cisco WLC model,
see the data sheet of the respective Cisco WLC model.
FlexConnect Groups and VLAN Support
You can configure VLAN Support and VLAN ID on a per FlexConnect group basis. This allows all APs in
a FlexConnect group to inherit the VLAN configuration from the FlexConnect group including VLAN support,
Native VLAN, and WLAN-VLAN mappings.
When Local Mode APs are added to a FlexConnect Group with VLAN Support enabled, APs are converted
to FlexConnect APs and inherit the WLAN-VLAN mapping in the FlexConnect Group.
This feature is supported on all WLC model that support FlexConnect and all APs that support FlexConnect
mode.
Deployment Considerations
• When the override flag is set at the FlexConnect Group, modification of VLAN Support, Native VLAN
ID, WLAN-VLAN mappings, and Inheritance-Level at the AP is not allowed.
• An Inheritance-Level configuration is available at the FlexConnect AP. You have to set this to “Make
VLAN AP Specific” to configure any AP-Specific VLAN Support, Native VLAN ID and VLAN-WLAN
mappings on the AP. Note that you can modify this only when the override flag at the group is disabled.
To achieve this on the WLC GUI, choose Wireless > All APs, click on the AP name. In the FlexConnect
tab, select Make VLAN AP Specific from the drop-down list.
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Configuring FlexConnect Groups
Upgrade and Downgrade Considerations
• When you upgrade to Release 8.1, if the FlexConnect group has WLAN-VLAN mappings, then after
an upgrade, VLAN support is enabled and native VLAN is set to 1. Otherwise, the VLAN support
remains disabled on the FlexConnect group. The override flag on the FlexConnect Group is disabled.
• When you downgrade from Release 8.1, the VLAN Support and Native VLAN ID is on a per AP basis,
and the WLAN-VLAN mappings follow the previous inheritance model.
Configuring FlexConnect Groups
Configuring FlexConnect Groups (GUI)
Step 1
Choose Wireless > FlexConnect Groups to open the FlexConnect Groups page.
This page lists any FlexConnect groups that have already been created.
If you want to delete an existing group, hover your cursor over the blue drop-down arrow for that group and
choose Remove.
Click New to create a new FlexConnect Group.
On the FlexConnect Groups > New page, enter the name of the new group in the Group Name text box. You can
enter up to 32 alphanumeric characters.
Click Apply. The new group appears on the FlexConnect Groups page.
To edit the properties of a group, click the name of the desired group. The FlexConnect Groups > Edit page appears.
If you want to configure a primary RADIUS server for this group (for example, the access points are using 802.1X
authentication), choose the desired server from the Primary RADIUS Server drop-down list. Otherwise, leave the text
box set to the default value of None.
Note
IPv6 RADIUS Server is not configurable. Only IPv4 configuration is supported.
Note
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Step 8
If you want to configure a secondary RADIUS server for this group, choose the server from the Secondary RADIUS
Server drop-down list. Otherwise, leave the field set to the default value of None.
Configure the RADIUS server for the FlexConnect group by doing the following:
a) Enter the RADIUS server IP address.
b) Choose the server type as either Primary or Secondary.
c) Enter a shared secret to log on to the RADIUS server and confirm it.
d) Enter the port number.
e) Click Add.
Step 9
To add an access point to the group, click Add AP. Additional fields appear on the page under Add AP.
Step 10
Perform one of the following tasks:
• To choose an access point that is connected to this controller, select the Select APs from Current Controller
check box and choose the name of the access point from the AP Name drop-down list.
Note
If you choose an access point on this controller, the MAC address of the access point is automatically
entered in the Ethernet MAC text box to prevent any mismatches from occurring.
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Configuring FlexConnect Groups (GUI)
• To choose an access point that is connected to a different controller, leave the Select APs from Current Controller
check box unselected and enter its MAC address in the Ethernet MAC text box.
Note
Step 11
Step 12
Step 13
If the FlexConnect access points within a group are connected to different controllers, all of the controllers
must belong to the same mobility group.
Click Add to add the access point to this FlexConnect group. The access point’s MAC address, name, and status appear
at the bottom of the page.
Note
If you want to delete an access point, hover your cursor over the blue drop-down arrow for that access point
and choose Remove.
Click Apply.
Enable local authentication for a FlexConnect Group as follows:
a) Ensure that the Primary RADIUS Server and Secondary RADIUS Server parameters are set to None.
b) Select the Enable AP Local Authentication check box to enable local authentication for this FlexConnect Group.
The default value is unselected.
c) Click Apply.
d) Choose the Local Authentication tab to open the FlexConnect > Edit (Local Authentication > Local Users)
page.
e) To add clients that you want to be able to authenticate using LEAP, EAP-FAST, PEAP, or EAP-TLS, perform one
of the following:
f) Upload a comma-separated values (CSV) file by selecting the Upload CSV File check box, clicking the Browse
button to browse to an CSV file that contains usernames and passwords (each line of the file needs to be in the
following format: username, password), and clicking Add to upload the CSV file. The clients’ names appear on the
left side of the page under the “User Name” heading.
g) Add clients individually by entering the client’s username in the User Name text box and a password for the client
in the Password and Confirm Password text boxes, and clicking Add to add this client to the list of supported local
users. The client name appears on the left side of the page under the “User Name” heading.
Note
You can add up to 100
clients.
h) Click Apply.
i) Choose the Protocols tab to open the FlexConnect > Edit (Local Authentication > Protocols) page.
j) To allow a FlexConnect access point to authenticate clients using LEAP, select the Enable LEAP Authentication
check box.
k) To allow a FlexConnect access point to authenticate clients using EAP-FAST, select the Enable EAP-FAST
Authentication check box. The default value is unselected.
l) To allow a FlexConnect access point to authenticate clients using PEAP Authentication, select the Enable PEAP
Authentication check box.
You can configure PEAP authentication only when AP local authentication is configured.
m) To allow a FlexConnect access point to authenticate clients using EAP-TLS, select the Enable EAP TLS
Authentication check box.
You can configure EAP-TLS authentication only when AP local authentication is configured.
Enabling the EAP-TLS authentication results in enabling the downloading of EAP root and device certificate to the
access point. You can unselect the EAP TLS Certificate download check box if you do not want to download the
certificate.
n) Perform one of the following, depending on how you want protected access credentials (PACs) to be provisioned:
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Configuring FlexConnect Groups
Configuring FlexConnect Groups (CLI)
• To use manual PAC provisioning, enter the server key used to encrypt and decrypt PACs in the Server Key and
Confirm Server Key text boxes. The key must be 32 hexadecimal characters.
• To allow PACs to be sent automatically to clients that do not have one during PAC provisioning, select the
Enable Auto Key Generation check box
o) In the Authority ID text box, enter the authority identifier of the EAP-FAST server. The identifier must be 32
hexadecimal characters.
p) In the Authority Info text box, enter the authority identifier of the EAP-FAST server in text format. You can enter
up to 32 hexadecimal characters.
q) To specify a PAC timeout value, select the PAC Timeout check box and enter the number of seconds for the PAC
to remain viable in the text box. The default value is unselected, and the valid range is 2 to 4095 seconds when
enabled.
r) Click Apply.
Step 14
In the WLAN-ACL mapping tab, you can do the following:
a) Under Web Auth ACL Mapping, enter the WLAN ID, choose the WebAuth ACL, and click Add to map the web
authentication ACL and the WLAN.
b) Under Local Split ACL Mapping, enter the WLAN ID, and choose the Local Split ACL, and click Add to map the
Local Split ACL to the WLAN.
Note
You can configure up to 16 WLAN-ACL combinations for local split tunneling. Local split tunneling does
not work for clients with static IP address.
Step 15
In the Central DHCP tab, you can do the following:
a) In the WLAN Id box, enter the WLAN ID with which you want to map Central DHCP.
b) Select or unselect the Central DHCP check box to enable or disable Central DHCP for the mapping.
c) Select or unselect the Override DNS check box to enable or disable overriding of DNS for the mapping.
d) Select or unselect the NAT-PAT check box to enable or disable network address translation and port address translation
for the mapping.
e) Click Add to add the Central DHCP - WLAN mapping.
Note
When the overridden interface is enabled for the FlexConnect Group DHCP, the DHCP broadcast to unicast is
optional for locally switched clients.
Click Save Configuration.
Repeat this procedure if you want to add more FlexConnects.
Note
To see if an individual access point belongs to a FlexConnect Group, you can choose Wireless > Access Points
> All APs > the name of the desired access point in the FlexConnect tab. If the access point belongs to a
FlexConnect, the name of the group appears in the FlexConnect Name text box.
Step 16
Step 17
Configuring FlexConnect Groups (CLI)
Step 1
Add add or delete a FlexConnect Group by entering this command:
config flexconnect group group_name {add | delete}
Step 2
Configure a primary or secondary RADIUS server for the FlexConnect group by entering this command:
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Configuring FlexConnect Groups (CLI)
config flexconnect group group_name radius server auth{add | delete} {primary | secondary} server_index
Step 3
Configure a primary or secondary RADIUS server for the FlexConnect group by entering this command:
config flexconect group group-name radius server auth {{add {primary | secondary} ip-addr auth-port secret} |
{delete {primary | secondary}}}
Step 4
Add an access point to the FlexConnect Group by entering this command:
config flexconnect group_name ap {add | delete} ap_mac
Step 5
Configure local authentication for a FlexConnect as follows:
a) Make sure that a primary and secondary RADIUS server are not configured for the FlexConnect Group.
b) To enable or disable local authentication for this FlexConnect group, enter this command:
config flexconnect group group_name radius ap {enable | disable}
c) Enter the username and password of a client that you want to be able to authenticate using LEAP, EAP-FAST, PEAP,
or EAP-TLS by entering this command:
config flexconnect group group_name radius ap user add username password password
Note
You can add up to 100
clients.
d) Allow a FlexConnect access point group to authenticate clients using LEAP or to disable this behavior by entering
this command:
config flexconnect group group_name radius ap leap {enable | disable}
e) Allow a FlexConnect access point group to authenticate clients using EAP-FAST or to disable this behavior by
entering this command:
config flexconnect group group_name radius ap eap-fast {enable | disable}
f) To download EAP Root and Device certificate to AP, enter this command:
config flexconnect group group_name radius ap eap-cert download
g) Allow a FlexConnect access point group to authenticate clients using EAP-TLS or to disable this behavior by entering
this command:
config flexconnect group group_name radius ap eap-tls {enable | disable}
h) Allow a FlexConnect access point group to authenticate clients using PEAP or to disable this behavior by entering
this command:
config flexconnect group group_name radius ap peap {enable | disable}
i) Allow a FlexConnect access point group to authenticate clients using PEAP or to disable this behavior by entering
this command:
config flexconnect group group_name radius ap peap {enable | disable}
j) Allow a FlexConnect access point group to authenticate clients using EAP-TLS or to disable this behavior by entering
this command:
config flexconnect group group_name radius ap eap-tls {enable | disable}
k) Download the EAP root and device certificate by entering this command:
config flexconnect group group_name radius ap eap-cert download
l) Enter one of the following commands, depending on how you want PACs to be provisioned:
• config flexconnect group group_name radius ap server-key key—Specifies the server key used to encrypt
and decrypt PACs. The key must be 32 hexadecimal characters.
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Configuring FlexConnect Groups (CLI)
• config flexconnect group group_name radius ap server-key auto—Allows PACs to be sent automatically to
clients that do not have one during PAC provisioning.
m) To specify the authority identifier of the EAP-FAST server, enter this command:
config flexconnect group group_name radius ap authority id id
where id is 32 hexadecimal characters.
n) To specify the authority identifier of the EAP-FAST server in text format, enter this command:
config flexconnect group group_name radius ap authority info info
where info is up to 32 hexadecimal characters.
o) To specify the number of seconds for the PAC to remain viable, enter this command:
config flexconnect group group_name radius ap pac-timeout timeout
where timeout is a value between 2 and 4095 seconds (inclusive) or 0. A value of 0, which is the default value,
disables the PAC timeout.
Step 6
Configure a Policy ACL on a FlexConnect group by entering this command:
config flexconnect group group-name policy acl {add | delete} acl-name
Step 7
Configure local split tunneling on a per-FlexConnect group basis by entering this command:
config flexconnect group group_name local-split wlan wlan-id acl acl-name flexconnect-group-name {enable |
disable}
Step 8
To set multicast/broadcast across L2 broadcast domain on overridden interface for locally switched clients, enter this
command:
config flexconnect group group_name multicast overridden-interface {enable | disable}
Step 9
Configure central DHCP per WLAN by entering this command:
config flexconnect group group-name central-dhcp wlan-id {enable override dns | disable | delete}
Step 10
Configure the DHCP overridden interface for FlexConnect group, use the
configflexconnectgroupflexgroupdhcpoverridden-interfaceenablecommand.
Step 11
Configure policy acl on FlexConnect group by entering this command:
config flexconnect group group_name policy acl {add | delete} acl-name
Step 12
Configure web-auth acl on flexconnect group by entering this command:
config flexconnect group group_name web-auth wlan wlan-id acl acl-name {enable | disable}
Step 13
Configure wlan-vlan mapping on flexconnect group by entering this command:
config flexconnect group group_name wlan-vlan wlan wlan-id{add | delete}vlan vlan-id
Step 14
To set efficient upgrade for group, enter this command:
config flexconnect group group_name predownload {enable | disable | master | slave} ap-name retry-count maximum
retry count ap-name ap-name
Step 15
Save your changes by entering this command:
save config
Step 16
See the current list of flexconnect groups by entering this command:
show flexconnect group summary
Step 17
See the details for a specific FlexConnect Groups by entering this command:
show flexconnect group detail group_name
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Configuring FlexConnect Groups
Configuring VLAN-ACL Mapping on FlexConnect Groups
Configuring VLAN-ACL Mapping on FlexConnect Groups
Configuring VLAN-ACL Mapping on FlexConnect Groups (GUI)
Step 1
Choose Wireless > FlexConnect Groups.
The FlexConnect Groups page appears. This page lists the access points associated with the controller.
Step 2
Step 3
Click the Group Name link of the FlexConnect Group for which you want to configure VLAN-ACL mapping.
Step 4
Step 5
Step 6
Step 7
Enter the Native VLAN ID in the VLAN ID text box.
From the Ingress ACL drop-down list, choose the Ingress ACL.
From the Egress ACL drop-down list, choose the Egress ACL.
Click Add to add this mapping to the FlexConnect Group.
The VLAN ID is mapped with the required ACLs. To remove the mapping, hover your mouse over the blue drop-down
arrow and choose Remove.
Click the VLAN-ACL Mapping tab.
The VLAN-ACL Mapping page for that FlexConnect group appears.
Note
The Access Points inherit the VLAN-ACL mapping on the FlexConnect groups if the WLAN VLAN mapping
is also configured on the groups.
Configuring VLAN-ACL Mapping on FlexConnect Groups (CLI)
• config flexconnect group group-name vlan add vlan-id acl ingress-acl egress acl
Add a VLAN to a FlexConnect group and map the ingress and egress ACLs by entering this command:
Viewing VLAN-ACL Mappings (CLI)
• show flexconnect group detail group-name
View FlexConnect group details.
• show ap config general ap-name
View VLAN-ACL mappings on the AP.
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Configuring FlexConnect Groups
Configuring WLAN-VLAN Mappings on FlexConnect Groups
Configuring WLAN-VLAN Mappings on FlexConnect Groups
Configuring WLAN-VLAN Mapping on FlexConnect Groups (GUI)
Following are a few guidelines:
• The individual AP settings have precedence over FlexConnect group and global WLAN settings. The
FlexConnect group settings have precedence over global WLAN settings.
• The AP level configuration is stored in flash; WLAN and FlexConnect group configuration is stored in
RAM.
• When an AP moves from one controller to another, the AP can keep its individual VLAN mappings.
However, the FlexConnect group and global mappings will be from the new controller. If the WLAN
SSID differs between the two controllers, then the WLAN-VLAN mapping is not applied.
• In a downstream traffic, VLAN ACL is applied first and then the client ACL is applied. In an upstream
traffic, the client ACL is applied first and then the VLAN ACL is applied.
• The ACL must be present on the AP at the time of 802.1X authentication. If the ACL is not present on
the AP, a client might be denied authentication by the AP even if the client successfully passes 802.1X
authentication.
ACL Present on AP
ACL Name sent from AAA
Result of 802.1X Authentication
No
No
Authenticated, no ACL applied
No
Yes
Authentication Denied
Yes
No
Authenticated, no ACL applied
Yes
Yes
Authenticated, client ACL
applied
• After client authentication, if the ACL name is changed in the RADIUS server, the client must go through
a full authentication again to get the correct client ACL.
• The WLAN-VLAN mapping on FlexConnect groups is not supported on Cisco APs 1131 and 1242.
Before You Begin
Ensure that the WLAN is locally switched. The configuration is applied to the AP only if the WLAN is
broadcast on the AP.
Step 1
Step 2
Choose Wireless > FlexConnect Groups.
Click the group name.
The FlexConnect Groups > Edit page is displayed.
Step 3
Step 4
Click the WLAN VLAN Mapping tab.
Enter the WLAN ID and the VLAN ID and click Add.
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Configuring FlexConnect Groups
Configuring WLAN-VLAN Mapping on FlexConnect Groups (CLI)
The mapping is displayed in the same tab.
Step 5
Step 6
Select the VLAN Support check box and specify the Native VLAN ID.
Select the Override Native VLAN on AP check box.
• Overrides the VLAN Support and Native VLAN ID previously configured on the access points
• Changes the inheritance level at the AP to "Group Specific"
• Removes AP-specific WLAN-VLAN VLAN-ACL mappings
• Pushes the group-specific configuration including WLAN-VLAN mapping configured on the group to all the APs
in the group.
Step 7
To verify that the inheritance level is Group Specific:
a) Choose Wireless > Access Points > All APs and click the name of the AP.
b) In the FlexConnect tab, view the Inheritance Level field.
c) Click VLAN Mappings to view the details of WLAN-VLAN mappings.
Step 8
Step 9
Click Apply.
Click Save Configuration.
Configuring WLAN-VLAN Mapping on FlexConnect Groups (CLI)
Before You Begin
Ensure that the WLAN is locally switched. The configuration is applied to the AP only if the WLAN is
broadcast on the AP.
• config flexconnect group group-name wlan-vlan wlan wlan-id {add | delete} vlan vlan-id
Configure WLAN-VLAN mapping on a FlexConnect group by entering this command.
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