642| Increasing Network Uptime Through Redundancy and VRRP AOS-W 6.5.3.x| User Guide
Configuring a Master Switch for Redundancy and High Availability
Starting with AOS-W 6.4, a backup master switch can use the high availability feature. However, a backup
master switch can only accept standby connections from APs, and will not serve active APs as long as its master
redundancy role is backup.
Important Points to Remember
This typeof high availability deployment has the following requirements and limitations:
n A backup master switch can only form an active-standby pair with the master switch.
n The backup master cannot terminate active APs.
n Both the backup master and master switches must be configured with the dual switch role.
n The switch IPaddress defined in the high availability group profile must be the IP address of the VRRP
interface.
n The inter-switch heartbeat feature is not recommended for backup-master and master switch
pairs using the high availability feature. If the inter-switch heartbeat feature is enabled in a high
availability group profile for redundant masters, the inter-switch failover time must be greater than the
VRRP failover time. That is, the (heartbeat interval * heartbeat threshold) value should be greater than the
(advertisement time * 3 + preemption delay + skew time [which is based on priority]).
n In an HAsetup, it is recommended not to change the LMSIP in the APsystem profile to the IP address of
the standby switch when the APs are active on the standby switch.
Perform the following steps to configure switch high availability on a backup-master and master switch pair.
1. Configure the high availability group profile with a dual role for the master switch:
(host)(config) #ha group-profile grp1
(host)(HA group information "grp1"): controller <VRRP interface ipaddress> role dual
2. Configure the high availability group profile with a dual role for the backup-master switch:
(host) (HA group information "grp1"): controller <VRRP interface ipaddress> role dual
Migrating from VRRP Redundancy
Perform the following steps to migrate from VRRP to high availability redundancy:
1. Remove the VRRP IP address as the LMS IP address of the AP:
(host) (AP system profile) #no lms-ip
2. Configure the AP to use the active switch’s IP address (not VRRP the IP address) as the LMS-IP for the AP:
(host) (AP system profile) #lms-ip <ipaddress>
3. Configure the AP to use the standby switch IP address (not VRRP the IP address) as the backup LMS-IP for
the AP:
(host) (AP system profile) #bkup-lms-ip <ipaddress>
4. Configure the master switch with a dual role in the high availability group profile:
(host) (config) #ha group-profile grp1
(host) (HA group information "grp1"): controller <ipaddress> role dual
5. Configure the standby switch with a dual role in the high availability group profile:
(host) (HA group information "grp1"): controller <ipaddress> role dual
Migrating from Backup-LMS Redundancy
Perform the following steps to migrate from backup-LMS to high availability redundancy, while maintaining the
existing configuration as defined by the lms-ip and bkup-lms-ip parameters in the APsystem profile.
1. Configure the switch serving the AP with a dual role in the high availability group profile:
(host) (config) #ha group-profile grp1
(host) (HA group information "grp1"): controller <ipaddress> role dual
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