Enterasys Matrix DFE-Gold Series User Manual

Enterasys Matrix DFE-Gold Series Configuration Guide 19-1
19
LSNAT Configuration
ThischapterdescribestheLoadSharingNetworkAddressTranslation(LSNAT)configurationset
ofcommandsandhowtousethem.
Configuring Load Sharing Network Address Translation (LSNAT)
About LSNAT
AsdefinedinRFC2391,LSNATsupportsnetworkreliabilityandavailabilitybyenablinghigh
trafficserverstoloadbalance.ItallowsanIPaddressandportnumbertobecomeaVirtualIP
addressandportnumber(VIP),mappedtomanydevices.WhentheVIPisseenasadestination
addressand
destinationportnumberbytheLSNATdevice,thedevicetrapsthepacketandthen
translatestheVIPtoarealIPaddressandportcomb ination.Itdoesthisbyusingaselected
algorithmforchoosingfromthegroupofserveraddresses,andreplacestheVIPwiththeselected
IPaddress
andportnumber.For outgoingtransmissions,thetranslationismadefromtherealIP
addressandportcombinationtoVIP.
LSNAT Configuration Considerations
ThefollowingconsiderationsmustbetakenintoaccountwhenconfiguringLSNATonEnterasys
MatrixSeriesdevices:
•Onchassis‐basedsystems,onlyonerouterperchassiswillbeallowedtorunLSNATatagiven
time.
•ALLmodulesinthechassismusthaveupgradedmemoryto256MB,andmusthavean
advanced
licenseactivated.
•Aserverfarmcannotbesharedbydifferentvirtualservers.
Router: Unless otherwise noted, the commands covered in this chapter can be executed only
when the device is in router mode. For details on how to enable router configuration modes, refer to
Enabling Router Configuration Modes on page 2-103.
Note: An Enterasys Feature Guide document that contains a complete discussion on LSNAT
configuration exists at the following Enterasys web site: http://www.enterasys.com/support/
manuals/
Important Notice
LSNAT is an advanced routing feature that must be enabled with a license key. If you have purchased an
advanced license key, and have enabled routing on the device, you must activate your license as described in
Activating Licensed Features on page 2-58. in order to enable the LSNAT command set. If you wish to
purchase an advanced routing license, contact Enterasys Networks Sales.

Enterasys Matrix DFE-Gold Series Specifications

General

Brand	Enterasys
Model	Matrix DFE-Gold Series
Category	Switch
Language	English