ExtremeWare 7.5 Command Reference Guide
491
9
SLB Commands—“
i
” Series Switches
Only
This chapter discusses server load balancing (SLB) and flow redirection commands.
SLB distributes client requests transparently among several servers. The main use for SLB is for web
hosting (using redundant servers to increase the performance and reliability of busy websites).
You can use SLB to manage and balance traffic for client equipment such as web servers, cache servers,
routers, and proxy servers. SLB is especially useful for e-commerce sites, Internet service providers, and
managers of large intranets.
SLB also provides health checking. Health checking allows you to actively poll nodes to determine their
health. The switch makes new connections only if the virtual server and node are both enabled and
passing health checks. The switch considers a virtual server or node active unless a health check fails. If
a health check fails, the switch considers the virtual server or node inactive. A virtual server or node is
also considered inactive if it is disabled and has zero active connections.
Flow redirection overrides routing decisions to transparently redirect client requests to a target device
(or group of devices). Unlike SLB, you do not duplicate content on the target device(s).
The switch can only redirect traffic that crosses a VLAN boundary, because flow redirection operates at
layer 3. Flow redirection examines traffic and redirects it based on the following criteria, in order of
priority:
1
Destination IP address and mask
2
Layer 4 port
3
Source IP address and mask
You can use flow redirection for the following:
•
Web cache redirection
•
Policy-based routing
Summary of Contents for ExtremeWare 7.5
Page 402: ...402 ExtremeWare 7 5 Command Reference Guide VLAN Commands ...
Page 470: ...470 ExtremeWare 7 5 Command Reference Guide QoS Commands ...
Page 490: ...490 ExtremeWare 7 5 Command Reference Guide NAT Commands ...
Page 826: ...826 ExtremeWare 7 5 Command Reference Guide Commands for Status Monitoring and Statistics ...
Page 1090: ...1090 ExtremeWare 7 5 Command Reference Guide Security Commands ...
Page 1386: ...1386 ExtremeWare 7 5 Command Reference Guide Wireless Commands ...
Page 1436: ...1436 ExtremeWare 7 5 Command Reference Guide EAPS Commands ...
Page 1568: ...1568 ExtremeWare 7 5 Command Reference Guide ESRP Commands ...
Page 1844: ...1844 ExtremeWare 7 5 Command Reference Guide IGP Commands ...
Page 1930: ...1930 ExtremeWare 7 5 Command Reference Guide BGP Commands i Series Switches Only ...
Page 2022: ...2022 ExtremeWare 7 5 Command Reference Guide IP Multicast Commands ...
Page 2066: ...2066 ExtremeWare 7 5 Command Reference Guide IPX Commands i Series Platforms Only ...
Page 2082: ...2082 ExtremeWare 7 5 Command Reference Guide ARM Commands BlackDiamond Switch Only ...
Page 2094: ...2094 ExtremeWare 7 5 Command Reference Guide Remote Connect Commands ...
Page 2174: ...2174 ExtremeWare 7 5 Command Reference Guide PoS Commands BlackDiamond Switch Only ...
Page 2372: ...2372 ExtremeWare 7 5 Command Reference Guide LLDP Commands ...
Page 2422: ...2422 ExtremeWare 7 5 Command Reference Guide H VPLS Commands BlackDiamond Switch Only ...
Page 2528: ...2528 ExtremeWare 7 5 Command Reference Guide MPLS Commands BlackDiamond Switch Only ...
