Alteon Application Switch Operating System Application Guide
High Availability
576
Document
ID:
RDWR-ALOS-V2900_AG1302
After the request is sent, the timer routine is disabled with reset flag sfo_sync_req_flg.
•
On the receipt of the sync message, the master invokes a response timer routine with one
second time interval.
After the master sends all the sessions to the backup, the total number of synced sessions are
logged with a syslog.
Service-based Session Failover (Session Mirroring) Limitations and
Recommendations
Limitations
•
The feature is supported only in group-based active-standby and hot standby VRRP
configurations.
•
The following filters and protocols are supported:
—
SIP
—
FTP (when ftpp is disabled under
cfg/slb/virt/service
)
—
Layer 4 SLB with delayed binding
—
NAT filters
•
The following filters and protocols are not supported:
—
Active-active VRRP
—
RTSP
—
Layer 7 SLB
—
Allow/deny/redir
filters
Recommendations
•
Ensure a direct interswitch link between the master and backup, as NAAP packets cannot be
routed.
•
The same priorities on all Alteons.
•
Preemption enabled.
•
Layer 4 switch port tracking enabled (
/cfg/l3/vrrp/vr/track/l4pts
).
•
A holdoff interval of at least 3 seconds (
/cfg/l3/vrrp/holdoff
).
Service-Based Session Failover Commands
The following are commands that support this feature.
To enable and disable mirroring for a service
>> Main # /cfg/slb/virt <Virtual Server> /service <Service Number> / mirror
{enable|disable}
