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NetStructure™ 480T Routing Switch User Guide
configure slb proxy-client-persistent [add |
delete] <ipaddress / mask>
Sticky Persistence
Sticky persistence provides a special type of persistence that is
especially useful for cache servers. Similar to client persistence,
sticky persistence keeps track of incoming clients’ source and
destination IP addresses.
When a client is looking to make a repeat connection to a particular
destination IP address, the 480T routing switch directs the client to
the same cache server or other transparent node that it used
previously.
Allowing clients to repeatedly use the same cache server can help
you reduce the amount of content that might otherwise be
duplicated on two or more cache servers in your network.
To prevent sticky entries
from clumping on one
server, use a static load
balancing mode, such as
round-robin.
Sticky persistence provides the most benefit when you load balance
caching proxy servers. A caching proxy server intercepts Web
requests and returns a cached Web page if it is available. To
improve the efficiency of the cache on these proxies, it is necessary
to send similar requests to the same proxy server repeatedly.
You can only activate
sticky persistence on
wildcard virtual servers.
You can use sticky persistence to cache a given Web page on one
proxy server instead of on every proxy server in an array. This saves
the other proxies from duplicating the Web page in their cache,
wasting memory.
To configure sticky persistence, use this command:
enable slb vip [<vipname> | all] sticky-
persistence {timeout <seconds>}
Server Load Balancing with ESRP
Using ESRP (Enterprise Standby Router Protocol), the SLB service
is made redundant, along with the Layer 2 and Layer 3 services of
the 480T routing switch . This configuration allows single- or dual-
attached servers to support redundant gateway services and very
fast recovery from a fault.
When ESRP is enabled, all servers can be online at the same time
(as opposed to only the ones connected to the active switch in High