Specifications

Terms and Definitions
September 8, 2010 Page 25 of 28
ThiscompletestheLSNATconfigurationexample.
Terms and Definitions
Table 5liststermsanddefinitionsusedinthisLSNATconfigurationdiscussion.
Table 5 LSNAT Configuration Terms and Definitions
Term Definition
Application Content
Verification (ACV)
A failure detection LSNAT feature that assures that the server application is running
before beginning a session.
binding A resource that tracks a connection from client to the LSNAT router and from the
LSNAT router to the real server.
least connections A load balancing algorithm that assigns sessions based upon the server in the pool
with the least current active sessions assigned.
load balancing An LSNAT feature that assigns sessions over multiple real servers based upon a
configured predictor.
LSNAT LSNAT is a load balancing routing feature that provides load sharing between
multiple servers grouped into server farms. LSNAT can be tailored to individual
services or all services.
port service
verification
A failure detection LSNAT feature that assures that the port is in an up state before
beginning a session.
predictor A load balancing (sharing) algorithm such as round robin, weighted round robin and
least connection.
real server The actual physical server that provides the services requested by the client.
request packet A data packet sent by the client to the virtual server requesting services.
response packet A data packet sent by the real server to the service requesting client.
server farm A logical entity of multiple real servers that faces the client through a virtual server.
session sticky type The concept that the client will be directed to the same physical server for the
duration of a session based upon a configured binding type (TCP, SIP, or SIP
DPORT).
simple round robin A load balancing algorithm that assigns sessions based upon an equal weight
ordering of the servers. When all servers in the ordering have been assigned a
session, the algorithm returns to the first server in the server list.
sticky mode An LSNAT feature that assures all service requests from a particular client will be
directed to the same real server for that session.
Virtual IP (VIP)
address
The IP address of the LSNAT virtual server that functions as the public face of the
real server.
virtual server A logical entity that the client interacts with by acting as the public face for the real
server.
weighted round
robin
A load balancing algorithm that assigns sessions based upon the configured server
weight. For instance, if there are two servers the first of which has a weight of 2 and
the second has a weight of 3, then for every 5 sessions, the first will be assigned 2
sessions and the second will be assigned 3 sessions.