Specifications

Configuring and Managing IP Interfaces
RoamAbout Mobility System Software Configuration Guide 5-3
How MSS Resolves Conflicts with Statically Configured IP Parameters
MSScomparestheIPparametervaluesalreadyconfiguredontheswitchwiththevaluesreceived
fromtheDHCPserver,andresolvesanyconflictsasfollows:
•IPaddress—IftheVLANalsohasastaticallyconfiguredIPaddress,MSSusesanaddress
fromtheDHCPserverinsteadofthestaticallyconfiguredaddress.
MSS
sendsanARPfortheIPaddressofferedbytheDHCPservertoverifythattheaddressis
notalreadyinuse.
–Iftheaddressisnotinuse,MSSconfigurestheVLANthathastheDHCPclientenabled
withtheIPaddressreceivedfromtheDHCPserver.MSSthenconfigures
theothervalues
asfollows:
‐ Defaultrouter—MSSaddsadefaultrouteforthegateway,withametricof10.
‐ DNSdomainnameandDNSserverIPaddress—IfthedefaultdomainnameandDNS
serverIPaddressarealreadyconfiguredontheswitch,andDNSisenabled,the
configuredvaluesare
used.Otherwise,thevaluesreceivedfromtheDHCPserverare
used.
–IftheaddressofferedbytheDHCPserverisalreadyinuse,MSSsendsaDHCPDecline
messagetotheserverandgeneratesalogmessage.
–IftheaddressisinasubnetthatisalreadyconfiguredonanotherVLAN
ontheswitch,
MSSsendsaDHCPDeclinemessagetotheserverandgeneratesalogmessage.
Iftheswitchispowereddownorrestarted,MSSdoesnotretainthevaluesreceivedfromthe
DHCPserver.However,iftheIPinterfacegoesdownbutMSSisstillrunning,MSSattemptsto
reusetheaddresswhentheinterfacecomesbackup.
Configuring the DHCP Client
ToconfiguretheDHCPclientonaVLAN,usethefollowingcommand:
set interface vlan-id ip dhcp-client {enable | disable}
Thevlan‐idcanbetheVLANnameornumber.
Example
ThefollowingcommandenablestheDHCPclientonVLANcorpvlan:
RBT-8100# set interface corpvlan ip dhcp-client enable
success: change accepted.
YoucanconfiguretheDHCPclientonmorethanoneVLAN,buttheclientcanbeactiveononly
oneVLAN.
ToremoveallIPinformationfromaVLAN ,includingtheDHCPclientanduser‐configured
DHCPserver,usethefollowingcommand:
clear interface vlan-id ip
Note: This command clears all IP configuration information from the interface.