Specifications

Managing the Layer 2 Forwarding Database
RoamAbout Mobility System Software Configuration Guide 4-21
•Static—Astaticentrydoesnotageout,regardlessofhowoftentheentryisused.However,
likedynamicentries,staticentriesareremovediftheRoamA boutSwitchispowereddownor
rebooted.
• Permanent—Apermanententrydoesnotageout,regardlessof howoftentheentryisused.In
addition,apermanent
entryremainsintheforwardingdatabaseevenfollowing arebootor
powercycle.
How Entries Enter the Forwarding Database
Anentryenterstheforwardingdatabaseinoneofthefollowingways:
•LearnedfromtrafficreceivedbytheRoamAboutSwitch—WhentheRoamAboutSwitch
receivesapacket,theswitchaddsthepacket’ssou rceMACaddresstotheforwarding
databaseifthedatabasedoesnotalreadycontainanentryforthatMACaddress.
• Added
bythesystemadministrator—Youcanaddstaticandpermanentunicastentriestothe
forwardingdatabase.(Youcannotaddamulticastorbroadcastaddressasapermanentor
staticforwardingdatabaseentry.)
• AddedbytheRoamAboutSwitchitself—Forexample,theauthenticationprotocolscanadd
entriesforwiredandwirelessauthenticationusers.The
RoamAboutSwitchalsoaddsany
staticentriesaddedbythesystemadministratorandsavedintheconfigurationfile.
Displaying Forwarding Database Information
Youcandisplaytheforwardingdatabasesizeandthe entriescontainedinthedatabase.
Displaying the Size of the Forwarding Database
Todisplaythenumberofentriescontainedintheforwardingdatabase,usethefollowing
command:
show fdb count {perm | static | dynamic} [vlan vlan-id]
Example
Todisplaythenumberofdynamicentriesthattheforwardingdatabasecontains,typethe
followingcommand:
RBT-8100# show fdb count dynamic
Total Matching Entries = 2
Displaying Forwarding Database Entries
Todisplaytheentriesintheforwardingdatabase,useeitherofthefollowingcommands:
show fdb [mac-addr-glob [vlan vlan-id]]
show fdb {perm | static | dynamic | system | all} [port port-list | vlan vlan-id]
Themac‐addr‐globparametercanbeanindividualaddress,oraportion ofanaddresswiththe
asterisk(*)wildcardcharacterrepresentingfrom1to5bytes.Thewildcardallowstheparameter
toindicatealistofMACaddressesthatmatchallthecharactersexcepttheasterisk.
Useacolon
betweeneachbyteintheaddress(forexample,11:22:33:aa:bb:ccor11:22:33:*).You
canentertheasterisk(*)atthebeginningorendoftheaddressasawildcard,onanybyte
boundary.