User guide

September 2009
OmniSwitch 6400/6850/6855/9000/9000E------ Release 6.4.2.R01 Page 47 of 79
When used as an SSH Client, the following SSH Software is supported on the indicated operating
systems:
SSH Software Supported Operating Systems
OpenSSH Sun Solaris, Linux Red Hat, AOS
F-Secure Sun Solaris, Win 2000
SSH-Communication Sun Solaris, Win 2000, Win XP, Linux Red Hat
Secure Shell (SSH) Public Key Authentication
DSA public key authentication is supported when using PuTTY SSH software to generate the private
and public key for the client and to access the switch. It is now possible to enforce the use of public
key authentication only on the switch. By default, both password and public key authentication are
allowed.
Server Load Balancing (SLB)
Server Load Balancing (SLB) software provides a method to logically manage a group of physical
servers sharing the same content (known as a server farm) as one large virtual server (known as an
SLB cluster). SLB clusters are identified and accessed at Layer 3 by the use of Virtual IP (VIP)
addresses or at Layer 2 or Layer 3 by the use of a QoS policy condition. The OmniSwitch operates at
wire speed to process client requests addressed to the VIP of an SLB cluster or classified by a QoS
policy condition and send them to the physical servers within the cluster.
Using SLB clusters can provide cost savings (costly hardware upgrades can be delayed or avoided),
scalability (as the demands on your server farm grow you can add additional physical servers),
reliability (if one physical server goes down the remaining servers can handle the remaining workload),
and flexibility (you can tailor workload requirements individually to servers within a cluster).
sFlow
sFlow is a network monitoring technology that gives visibility to the activity of the network, by
providing network usage information. It provides the data required to effectively control and manage
the network usage. sFlow is a sampling technology that meets the requirements for a network traffic
monitoring solution.
sFlow is a sampling technology embedded within switches/routers. It provides the ability to monitor
the traffic flows. It requires an sFlow agent software process running as part of the switch software and
an sFlow collector, which receives and analyses the monitored data. The sFlow collector makes use of
SNMP to communicate with an sFlow agent in order to configure sFlow monitoring on the device
(switch).
Up to two sFlow receivers can be configured.
Smart Continuous Switching – Stackable Products
In stacked configurations, one switch is designated as the primary “management module” for the stack.
Because the stack can be thought of as a virtual chassis, the role of this primary management switch is
to monitor and manage the functions of the entire stack.
Similar to chassis-based switches, the stack also includes a secondary, or backup, management module.
A stack’s secondary switch immediately takes over management functions in the event of a primary
switch failure.
All switches in the stack, besides the primary and secondary switch, are considered idle or in pass-
through. Idle switches act like Network Interface (NI) modules in chassis-based switches.