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High availability feature is enabled by default when the controllers are connected using the stack cable and the Cisco StackWise-480 technology is enabled. You will not be able to disable it; however, you can initiate a manual graceful-switchover using the command line interface to avail the high availability feature enabled in the controller.
An Access Point Stateful Switch Over ( AP SSO ) implies that all the access point sessions are switched over state-fully and the user session information is maintained during a switchover, and access points continue to operate in network with no loss of sessions, providing improved network availability. The active switch in the stack is equipped to perform all network functions, including IP functions and routing information exchange. Controller supports 1000 access points and 12000 clients.
However, all the clients are de-authenticated and need to be re-associated with the new active controller except for the locally switched clients in FlexConnect mode when a switchover occurs.
Note |
You can not disable AP SSO while in a controller stack once the controllers form a redundant pair. |
To perform a manual switchover and to avail high availability feature enabled in the controller, execute the redundancy force-switchover command. This command initiates a graceful switchover from the then active to the standby controller.
controller#redundancy force-switchover System configuration has been modified. Save ? [yes/no] : yes Building configuration … Preparing for switchover … Compressed configuration from 14977 bytes to 6592 bytes[OK]This will reload the active unit and force switchover to standby[confirm] : y
The LAG or an EtherChannel, bundles all the existing ports in both the standby and active units into a single logical port? link? to provide an aggregate bandwidth of 60 Gbps. The creation of Etherchannel enables protection against failures. The Etherchannels or LAG created are used for link redundancy to ensure high availability of access points.
1. Connect two controllers that are in powered down state using the stack cable.
2. Power up and perform a boot on both controllers simultaneously or power and boot one controller.
3. Configure Etherchannel or LAG on the units.
4. Execute the show etherchannel summary command to view status of the configured Etherchannel.
5. Execute the show ap uptime command to verify the connected access points.
1. conf t
2. interface Port-channel number
3. lacp max-bundle number
4. lacp port-priority number
5. switchport backup interface Po2
6. end
7. show etherchannel summary
8. show interfaces switchport backup
You can only access the console of the active controller in a stack. To access the standby controller console, use the following commands; however, use this functionality only under supervision of Cisco Support.
1. conf t
2. service internal
3. redundancy
4. main-cpu
5. standby console enable
6. exit
A switchover happens when the active controller fails; however, while performing a manual switchover, you can execute the commands listed in this section to ensure if you can initiate a successful swicthover.
1. show redundancy states
2. show switch detail
3. show platform SES states
4. show ap summary
5. show CAPWAP detail
6. show dtls database-brief
7. show power inline
This section defines the steps that you must perform to ensure that successful switchover from the active to standby switch is performed. On successful switchover of the standby switch as active, all access points connected to the active need to re-join the standby (then active) switch.
1. show ap uptime
2. show wireless summary
3. show wcdb database all
4. show power inline
Command |
Description |
---|---|
show switch |
Displays summary information about the stack, including the status of provisioned switches and switches in version-mismatch mode. |
show switch stack-member-number |
Displays information about a specific member. |
show switch detail |
Displays detailed information about the stack. |
show switch neighbors |
Displays the stack neighbors. |
show switch stack-ports [summary] |
Displays port information for the stack. Use the summary keyword to display the stack cable length, the stack link status, and the loopback status. |
show redundancy |
Displays the redundant system and the current processor information. The redundant system information includes the system uptime, standby failures, switchover reason, hardware, configured and operating redundancy mode. The current processor information displayed includes the active location, the software state, the uptime in the current state and so on. |
show redundancy state |
Displays all the redundancy states of the active and standby controllers. |
This example shows how to configure LACP and to verify creation of the LACP bundle and the status:
Controller(config)# ! interface TenGigabitEthernet1/0/1 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet1/0/2 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet1/0/3 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet1/0/4 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface TenGigabitEthernet1/0/5 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface TenGigabitEthernet1/0/6 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface TenGigabitEthernet2/0/1 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet2/0/2 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet2/0/3 switchport mode trunk channel-group 1 mode active lacp port-priority 10 ip dhcp snooping trust ! interface TenGigabitEthernet2/0/4 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface TenGigabitEthernet2/0/5 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface TenGigabitEthernet2/0/6 switchport mode trunk channel-group 1 mode active ip dhcp snooping trust ! interface Vlan1 no ip address ip igmp version 1 shutdown ! Controller# show etherchannel summary Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use f - failed to allocate aggregator M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 1 Po1(SU) LACP Te1/0/1(P) Te1/0/2(P) Te1/0/3(P) Te1/0/4(H) Te1/0/5(H) Te1/0/6(H) Te2/0/1(P) Te2/0/2(P) Te2/0/3(P) Te2/0/4(H) Te2/0/5(H) Te2/0/6(H)
This example shows the switch backup interface pairs:
Controller# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface Backup Interface State
------------------------------------------------------------------------
Port-channel1 Port-channel2 Active Standby/Backup Up
This example shows the summary of the Etherchannel configured in the controller:
Controller# show ethernet summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
1 Po1(SU) LACP Te1/0/1(P) Te1/0/2(P) Te1/0/3(P)
Te1/0/4(P) Te1/0/5(P) Te1/0/6(P)
2 Po2(SU) LACP Te2/0/1(P) Te2/0/2(P) Te2/0/3(P)
Te2/0/4(P) Te2/0/5(P) Te2/0/6(P)
This example shows how to configure flex link and to verify creation and the status of the created link:
Controller(config)# ! interface Port-channel1 description Ports 1-6 connected to NW-55-SW switchport mode trunk switchport backup interface Po2 switchport backup interface Po2 preemption mode forced switchport backup interface Po2 preemption delay 1 ip dhcp snooping trust ! interface Port-channel2 description Ports 7-12connected to NW-55-SW switchport mode trunk ip dhcp snooping trust ! interface GigabitEthernet0/0 vrf forwarding Mgmt-vrf no ip address negotiation auto ! interface TenGigabitEthernet1/0/1 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet1/0/2 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet1/0/3 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet1/0/4 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet1/0/5 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet1/0/6 switchport mode trunk channel-group 1 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/1 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/2 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/3 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/4 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/5 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface TenGigabitEthernet2/0/6 switchport mode trunk channel-group 2 mode on ip dhcp snooping trust ! interface Vlan1 no ip address Controller# show etherchannel summary Flags: D - down P - bundled in port-channel I - stand-alone s - suspended H - Hot-standby (LACP only) R - Layer3 S - Layer2 U - in use f - failed to allocate aggregator M - not in use, minimum links not met u - unsuitable for bundling w - waiting to be aggregated d - default port Number of channel-groups in use: 2 Number of aggregators: 2 Group Port-channel Protocol Ports ------+-------------+-----------+----------------------------------------------- 1 Po1(SU) - Te1/0/1(P) Te1/0/2(P) Te1/0/3(P) Te1/0/4(P) Te1/0/5(P) Te1/0/6(P) 2 Po2(SU) - Te2/0/1(P) Te2/0/2(P) Te2/0/3(D) Te2/0/4(P) Te2/0/5(P) Te2/0/6(P)
Step 1 |
Click The Redundancy States page is displayed. The values for the following parameters are displayed in the page:
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Step 2 | Click Apply. |