Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 26.1.x
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Cisco Catalyst 9800 Series Wireless Controller Software Configuration Guide, Cisco IOS XE 26.1.x
Updated: April 10, 2026
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Explains IPv6 support and traffic handling when using FlexConnect and mesh deployments with Cisco Catalyst Wireless Controllers.
A FlexConnect and mesh deployment is a wireless network configuration that
enables IPv6 as the primary backhaul transport for service provider
supports IPv6 clients connecting via WLANs on the Cisco Catalyst 9800 series wireless controller and Cisco Embedded Wireless controller on Catalyst APs, and
forwards IPv6 client traffic efficiently to the network core.
| 1. | Enter the global configuration mode. Example: |
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| 2. | Create an interface and enter the interface configuration mode. Example: |
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| 3. | Disable the interface configuration. Example: |
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| 4. | (Optional) Enable IPv6 on the interface. Example: |
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| 5. | Configure IPv6 address on the interface using the IPv6 prefix option. Example: |
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| 6. | Enable the IPv6 address. Example: |
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| 7. | Enable the PIM dense-mode operation. Example: |
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| 8. | Return to the privileged EXEC mode. Example: |
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| 9. | Verify your entries and check the gateway connectivity. Example: |
| 1. | Choose Configuration > Tags & Profiles > AP Join. |
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| 2. | Click the AP Join Profile Name. The Edit AP Join Profile window is displayed. |
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| 3. | Choose CAPWAP > Advanced. |
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| 4. | Select IPV6 from the Preferred Mode drop-down list. |
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| 5. | Click Update & Apply to Device. |
| 1. | Enter the global configuration mode. Example: |
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| 2. | Enter the AP profile configuration mode. Example: |
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| 3. | Use IPv6 to join the controller . Example: |
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| 4. | Exit the configuration mode and return to the privileged EXEC mode. Example: |
To verify the IPv6 configuration on the controller , use this show command:
Device# show ip interface brief
Interface IP-Address OK? Method Status Protocol
GigabitEthernet2 unassigned YES unset up up
GigabitEthernet0 unassigned YES NVRAM administratively down down
Capwap1 unassigned YES unset up up
Capwap2 unassigned YES unset up up
Vlan1 unassigned YES NVRAM administratively down down
Vlan89 9.10.89.90 YES NVRAM up up
Ewlc-9.10.89.90#show running-config interface vlan 89
Building configuration...
Current configuration : 120 bytes
!
interface Vlan89
ip address 9.10.89.90 255.255.255.0
ip helper-address 9.1.0.100
no mop enabled
no mop sysid
end
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