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OSPF Commands
5-88 Configuring the Internet Protocol
XSR(config)#router ospf
XSR(config)#network 172.16.152.0 0.0.0.0 area 10
XSR(config)#area 10 stub
area virtual-link
ThiscommanddefinesanOSPFvirtuallink,whichrepresentsalogicalconnectionbetweenthe
backboneandanon‐backboneOSPFarea.BackbonesareareasincludingallABRs,networksnot
whollycontainedinanyarea,andtheir attachedrouters.
Syntax
area area-id virtual-link router-id [authentication [message-digest | null]]
[hello-interval seconds] [retransmit-interval seconds] [transmit-delay seconds]
[dead-interval seconds] [authentication-key key | message-digest-key keyid md5
key]
Syntax of the “no” Form
area-id
Transitareaforthevirtuallink‐expressedasdecimalorIPaddresses‐
andthroughwhichavirtuallinkisestablished.
router-id
TheABR’sRouterID.AvirtuallinkisbuiltfromtheABR,wherevirtual
linkconfigurationoccurs.Youcanconfigurealoopbackaddressforthe
XSRtobeusedastheRouterIDwiththe
interface loopback
command.Ifnoloopbackaddressisdefined,theRouterIDisthe
highestnon‐zeroIPaddressofexistingconfiguredandactiveinterfaces.
authentication
Authenticationtype.
message-digest
MD5authenticationisused.
null
Noauthenticationisused.
hello-interval
seconds
Intervalbetweenhellopacketsonaport.Itmustbethesameforall
nodesattachedtoanetwork.Range:1to3600seconds.
retransmit-
interval
seconds
IntervalbetweensuccessiveretransmissionsofthesameLSAs.Valid
valuesaregreaterthantheexpectedperiod
fortheupdatepacketto
reachandreturnfromtheport,rangingfrom1to3600seconds.
transmit-delay
seconds
Estimatedintervalforalinkstateupdatepacketontheporttobe
transmitted,rangingfrom1to3600seconds.
dead-interval
seconds
Intervalthathellopackets ofarouterarenot communicatedtoneighbor
routersbeforetheneighborlearnthattheroutersendingthehello
packetisoutofservice.Thisvaluemustbethesameforallnodes
attachedtoacertainsubnet,andrangesfrom1to3600seconds.
authentication
key
Passwordusedbyneighborrouters.Validvaluesarealphanumeric
stringsupto8bytes.Neighborroutersonanetworkmusthavethe
samepassword.
message-digest
keyid md5 key
Specifiesakeyidandapassword(key)forMD5authentication.
Neighborroutersandthisrouterusethekeyidandkey.Validvalues
forkeyidare1to255.Validvaluesforthekeyarealphanumericstrings
ofupto16characters.Neighborroutersonanetworkmusthavethe
same
keyidandkey.