Lenovo Flex System Fabric CN4093 User Manual

76 CN4093 Application Guide for ENOS 8.4
Updating Software on vLAG Switches
WhenupdatingthesoftwareandbootimagesforswitchesconfiguredwithvLAG,
first:
 MakesurethatthespanningtreerootswitchisnotoneofthevLAGswitches
 Shutdownofportsshoulddoneundertheportconfiguration
 Followtheshutdownorderoftheports
a. ISLlinks
b. vLAGlinks
c. vLAGhealthcheck(MGTport)
Thenfollowthisproceduretoupdatethesoftwa reonvLAGswitches:
1. OnSwitch2(theoriginalSecondaryswitch),shutdownalllinksISL,vLAGlinks,
andvLAGHC.Thisisequivalenttopoweringoff
Switch2.
 AllthetrafficwillfailovertoSwitch1(theoriginalPrimaryswitch.).
 AftertheshutdownoflinksonSwitch2,therewillbeN‐Strafficlossofaround
~0.16seconds.
2. UpgradeSwitch2withthenewimage.UseFTP,STFP,orTFTPtocopythenew
ENOSandbootimagesontotheswitch.Formoredetails,see“LoadingNew
SoftwaretoYour
Switch”onpage 74.
 AfterSwitch2comesup,vLAGHCwillbeupandvLAGmismatchwillhappen
withvLAGportsdown(sinceitisstillSecondary).
 ThetrafficwillstillbeforwardingviaSwitch1(theoriginalPrimaryswitch).
3. OnSwitch1(theoriginalPrimaryswitch),shutdownalllinksISL, vLAGlinks,and
vLAGHC.ThisisequivalenttopoweringoffSwitch1(theoriginalPrimaryswitch)
 AllthetrafficwillfailovertoSwitch2,whichwillassumethevLAGoperation
roleofPrimary.
 AfterallthelinksareuponSwitch2,therewillbeN‐Strafficlossofaround~70
secondsduetospanningtreesreconverging.
4. UpgradeSwitch1(theoriginalPrimaryswitchwiththenewENOSimage.Use
FTP,STFP,orTFTPtocopythenewENOSand bootimagesonto
theswitch.For
moredetails,see“LoadingNewSoftwaretoYourSwitch”onpage 74.
 AfterSwitch1comesup,vLAGHC,ISL,andvLAGlinkswillbeup,andSwitch
1willassumethevLAGoperationroleofSecondary.
 AllthetrafficwillnowfollowthehashandloadbalancesettingsbetweenSwitch
1andSwitch2.
 TherewillbeN‐Strafficlossofaround~0.05seconds.
5. ChangetheoperationalroleofthevLAGswitchestomatchthefinaltopologyby
reloadingSwitch2.
 TherewillbeN‐Strafficlossofaround~0.102seconds.

Lenovo Flex System Fabric CN4093 Specifications

General

Brand	Lenovo
Model	Flex System Fabric CN4093
Category	Switch
Language	English