Alteon Application Switch Operating System Application Guide
Server Load Balancing
174
Document
ID:
RDWR-ALOS-V2900_AG1302
Check that all SLB parameters are working as expected. If necessary, make any appropriate
configuration changes and then check the information again.
Physical and Logical Real Server Modes
Alteon supports multiple real servers having the same IP address. To do this, you can define
numerous "physical" or "logical" real servers, all with the same IP address associated with the same
real, physical server.
Such real servers must either have different rports configured or associated to different server
groups, enabling Alteon to differentiate the destination ports on the server.
When using logical servers, you must enable DAM on the virtual service to which a logical server is
attached, or you must enable PIP for that logical server.
PIP is enabled for a server when PIP mode is enabled at the server level, and a PIP address is
configured either at server level or at virtual service level (when PIP mode is set to Ingress or
Egress, PIP must be configured at the port or VLAN level).
This feature provides greater flexibility in a number of the Alteon SLB operations:
•
Layer 7 content switching to specific application port
—
If you have multiple HTTP
applications running on the same real server differentiated by the listening port on the server,
the applications are identified by HTTP (Layer 7) content switching rules that review requesting
URL content to determine destination application port.
Alteon lets you define different real servers with the same IP address and different ports where
every HTTP application is configured on a separate real server with its own ports, all with the
same IP address. The real servers are associated with groups, each dedicated to a Layer 7
content switching rule on the virtual service.
•
Health check
—
Lets you configure scripted health checks for a server with multiple ports.
•
Maximum connections
—
Physical server—If you need to limit the maximum number of connections per physical
server (maximum TCP capacity), you can define multiple real servers with the same IP
address and set each real server mode to physical and its maximum connections
(maxcon) to the required value.
—
Logical server—If you need to limit the maximum number of connections per logical server
running on the same physical server, you can define multiple real servers with the same IP
address and set each real mode to logical and its maximum connections (maxcon) to the
required value.
You can also set the max connections mode to physical (default) or logical. Real servers with
the same IP address must be set to the same maxcon connection mode.
Real servers with the same IP address set to maximum connection mode physical must all have
the same maxcon value. The maxcon value is the maximum number of connections that the real
servers both support.
Real servers with the same IP address set to maximum connection mode logical can each have
different maxcon values. The maxcon value is the maximum number of connections that each
logical real server supports individually.
•
Logical server weight
—
The weight parameter is defined only per real server and not per
port. To prioritize multiple logical servers (daemons) with different processing requirements, you
can define multiple real servers, with different rports or in different groups, all with the same IP
address. You can then set each real server weight to its desired value.
>> Layer 4# /info/slb/dump
