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The high availability feature is enabled by default when the switches are connected using the stack cable and the Cisco StackWise-160 technology is enabled. You cannot disable it; however, you can initiate a manual graceful-switchover using the command line interface to use the high availability feature enabled in the switch.
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. The switch supports 1000 access points and 12000 clients.
However, all the clients are de-authenticated and need to be re-associated with the new active switch except for the locally switched clients in FlexConnect mode when a switchover occurs.
Once a redundancy pair is formed while in a stack, high availability is enabled, which includes that access points continue to remain connected during an active-to-standby switchover.
 Note |
You can not disable AP SSO while in a switch stack once the switches form a redundant pair. |
To perform a manual switchover and to use the high availability feature enabled in the switch, execute the redundancy force-switchover command. This command initiates a graceful switchover from the active to the standby switch.
Device# 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] : yThe LAG, or an EtherChannel, bundles all the existing ports in both the standby and active units into a single logical port to provide an aggregate bandwidth of 60 Gbps. The creation of an EtherChannel enables protection against failures. The EtherChannels or LAGs created are used for link redundancy to ensure high availability of access points.
| Step 1 |
Connect two switches that are in powered down state using the stack cable. |
| Step 2 |
Power up and perform a boot on both switches simultaneously or power and boot one switch. The switches boot up successfully, and form a high availability pair. |
| Step 3 |
Configure EtherChannel or LAG on the units. |
| Step 4 |
Use the show etherchannel summary command to view the status of the configured EtherChannel. On successful configuration, all the specified ports will be bundled in a single channel and listed in the command output of show etherchannel summary . |
| Step 5 |
Execute the show ap uptime command to verify the connected access points. |
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure terminal Example: |
|
| Step 2 |
interface port-channel number Example: |
|
| Step 3 |
lacp max-bundle number Example: |
Defines the maximum number of active bundled LACP ports allowed in a port channel. The value ranges from 1 to 8. |
| Step 4 |
lacp port-priority number Example: |
Specifies port priority to be configured on the port using LACP. The value ranges from 0 to 65535. |
| Step 5 |
switchport backup interface po2 Example: |
Specifies an interface as the backup interface. |
| Step 6 |
end |
|
| Step 7 |
show etherchannel summary Example: |
Displays a summary of EtherChannel properties. |
| Step 8 |
show interfaces switchport backup Example: |
Displays summary of backup EtherChannel properties. |
You can only access the console of the active switch in a stack. To access the standby switch, use the following commands.
Use this functionality only under supervision of Cisco Support.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
configure terminal Example: |
|
| Step 2 |
service internal Example: |
Enables Cisco IOS debug commands. |
| Step 3 |
redundancy Example: |
Enters redundancy configuration mode. |
| Step 4 |
main-cpu Example: |
Enters the redundancy main configuration submode. |
| Step 5 |
standby console enable Example: |
Enables the standby console. |
| Step 6 |
exit Example: |
Exits the configuration mode. |
A switchover happens when the active switch fails; however, while performing a manual switchover, you can execute these commands to initiate a successful switchover:
| Command or Action | Purpose | |||
|---|---|---|---|---|
| Step 1 |
show redundancy states Example: |
Displays the high availability role of the active and standby switches. |
||
| Step 2 |
show switch detail Example: |
Display physical property of the stack. Verify if the physical states of the stacks are "Ready" or "Port". |
||
| Step 3 |
show platform ses states Example: |
Displays the sequences of the stack manager. |
||
| Step 4 |
show ap summary Example: |
Displays all the access points in the active and standby switches. |
||
| Step 5 |
show capwap detail Example: |
Displays the details of the CAPWAP tunnel in the active and standby switches. |
||
| Step 6 |
show dtls database-brief Example: |
Displays DTLS details in the active and standby switches. |
||
| Step 7 |
show power inline Example: |
Displays the power on Ethernet power state.
|
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.
| Command or Action | Purpose | |
|---|---|---|
| Step 1 |
show ap uptime Example: |
Verify if the uptime of the access point after the switchover is large enough. |
| Step 2 |
show wireless summary Example: |
Display the clients connected in the active switch. |
| Step 3 |
show wcdb database all Example: |
Display if the client has reached the uptime. |
| Step 4 |
show power inline Example: |
Display the power over Ethernet power state. |
|
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 switches. |
This example shows how to configure LACP and to verify creation of the LACP bundle and the status:
Device(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
!
Device# 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:
Device# 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 switch:
Device# 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:
Device(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
Device# 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. |
| 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. |
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