Extreme Networks Px Series - Manual (Page 47)

Px Series Application Switch Installation and Configuration Guide 4-17
Utilities
Configuring a Startup Banner Message
To configure a banner message to display after reboot, use the following command:
config banner
At the prompt, type the banner message. To exit the banner input script, type
[Return][Return] .
To view the configured banner, use the following command:
show banner
Starting the GlobalPx Content Director Agent
Extreme Networks GlobalPx Content Director ™ is a DNS-based Internet traffic
management system, allowing you to take advantage of network and server resources
regardless of their location on the Internet or your Intranet. As you add points of presence
(POPs, clusters of one or more Px-series switches) to a network, GlobalPx Content
Director monitors server loads and network response latencies, distributing client
requests to the POP that it determines will deliver the best performance. GlobalPx
Content Director improves client access performance and reliability by leveraging
dispersed network resources.
The GlobalPx Content Director transparently directs clients and client DNS servers to
the most appropriate POP to satisfy client requests. Typically, the physically closest POP
is the one that gives the fastest response. However, this is not always the case. The
GlobalPx Content Director scheduler routes requests to the optimal POP. In determining
the optimal POP, the scheduler receives the following information from the Px series
application switch that runs the agents that monitor each POP:
• Client/server network latency—The time it takes for information to travel from the
POP to the client. The closest POP in terms of response time exhibits the least
latency.
• Real-time server load—The computing burden of the POP. The least loaded POP can
handle requests most quickly.
• Server availability—Only those POPs that are running and available are eligible to
receive requests. Requests are scheduled around failed POPs. Once an unavailable
POP comes back up, the scheduler includes it again as a possible POP for selection.
To minimize response time to the client, requests are directed to servers at a POP that is
available and that has the smallest network latency and load.