OSPF router ID question, please help me answer it
walaboom
Member Posts: 23 ■□□□□□□□□□
in CCNA & CCENT
Hello guys, I have a question on the selection of router ID when you run OSPF
From my understanding, router ID should be selected by the highest IP of any logical interface, however I am doing the exam practice question, it says the the router ID is selected by the highest IP of ANY interface (both logical and physical)
I remember reading somewhere that as long as there is a loopback interface, the physical IP will not be an router ID consideration, am I wrong? Can someone please help me answer this......thanks in advance.
From my understanding, router ID should be selected by the highest IP of any logical interface, however I am doing the exam practice question, it says the the router ID is selected by the highest IP of ANY interface (both logical and physical)
I remember reading somewhere that as long as there is a loopback interface, the physical IP will not be an router ID consideration, am I wrong? Can someone please help me answer this......thanks in advance.
<a href="http://healthyandenergy.com/frs-energy/">FRS Healthy Energy</a>
Comments
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keenon
Member Posts: 1,922 ■■■■□□□□□□
that sounds correctBecome the stainless steel sharp knife in a drawer full of rusty spoons -
walaboom
Member Posts: 23 ■□□□□□□□□□
what sounds correct......?
will physical ip address be ignored when there is a loopback ?
or physical ip will be chosen to be the router ID when physical ip is the highest and loop back is present?<a href="http://healthyandenergy.com/frs-energy/">FRS Healthy Energy</a> -
Drakonblayde
Member Posts: 542
If there is a loopback configured, it takes precedence over all physical interfaces and will become the Router ID. If multiple loopbacks are configured, the one with the highest IP will become the Router ID. If no loopbacks are defined, then the physical interface with the highest IP will be tapped as the Router ID.
Make sense?= Marcus Drakonblayde
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walaboom
Member Posts: 23 ■□□□□□□□□□
yes, makes sense, thanks so much..... 1 more question, this is about configure the telnet access in the cisco router
line vty 0 4 configures all 5 lines of telnet access, what is the command if you want to configure only ONE telnet access?
I tried " line vty 0 " on my boson NetSim router, but apparently it does not work, is there a different command if you only want to configure 1 telnet access?<a href="http://healthyandenergy.com/frs-energy/">FRS Healthy Energy</a> -
Drakonblayde
Member Posts: 542
No, that's the right command.
line vty 0 4 specifies a range, if you just entered line vty 0, or line vty 3, or whatever on a real router, it'll let you configure just that line.= Marcus Drakonblayde
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CCNP-O-Meter:
=[0%]==[25%]==[50%]==[75%]==[100%]
==[X]===[X]====[ ]=====[ ]====[ ]==
=CCNA==BSCI==BCMSN==BCRAN==CIT= -
walaboom
Member Posts: 23 ■□□□□□□□□□
Thank you again Drakonblayde!!!<a href="http://healthyandenergy.com/frs-energy/">FRS Healthy Energy</a>
