OSPF question
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Posted by daytime on July 1, 2007, 5:13 am
Please log in for more thread options One of the questions has two answers-but which one is correct? In a multi access Ethernet network where does a router send an LSU when it detects a directly connected network has failed? 1-out all interfaces to all neighbors 2-To all congfigged neighbors within the AS 3-To all configged neighbors within theOSPF area 4 -to the DR my first attempt I put 3-which was marked incorrect-I then tried again with 4(which is the answer it gave me) then it said the answer was 3. Tried looking all over for a correct answer-all help greatfully appreciated. | |||||||||||||||||||||||||||||||
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Posted by Gabriele Beltrame on July 1, 2007, 5:49 am
Please log in for more thread options Hi, If there is a DR ( default for an Ethernet domain ) the LSUs are sent to the DR (and BDR) by multicasting using address 224.0.0.6 instead of the "usual" 224.0.0.5. The DR, in turn, sends the LSU to the other routers in the same ethernet domain. Regards, Gabriele | |||||||||||||||||||||||||||||||
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Posted by John Petersen on July 1, 2007, 11:17 am
Please log in for more thread options On Sun, 1 Jul 2007 11:49:11 +0200
>
> If there is a DR ( default for an Ethernet domain ) the LSUs are sent to the > DR (and BDR) by multicasting using address 224.0.0.6 instead of the "usual" > 224.0.0.5. The DR, in turn, sends the LSU to the other routers in the same > ethernet domain. By domain, do you mean the whole AS (all the areas) or the LAN segments the DR is directly connected to? | |||||||||||||||||||||||||||||||
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Posted by Gabriele Beltrame on July 1, 2007, 11:54 am
Please log in for more thread options
> On Sun, 1 Jul 2007 11:49:11 +0200
> >>
>> If there is a DR ( default for an Ethernet domain ) the LSUs are sent to >> the >> DR (and BDR) by multicasting using address 224.0.0.6 instead of the >> "usual" >> 224.0.0.5. The DR, in turn, sends the LSU to the other routers in the >> same >> ethernet domain. >
Hi,
> By domain, do you mean the whole AS (all the areas) or the LAN segments > the DR > is directly connected to? > > I mean broadcast domain. Regards, Gabriele | |||||||||||||||||||||||||||||||
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Posted by daytime on July 4, 2007, 1:25 pm
Please log in for more thread options >
> > On Sun, 1 Jul 2007 11:49:11 +0200
>
> >> If there is a DR ( default for an Ethernet domain ) the LSUs are sent to
> >> the > >> DR (and BDR) by multicasting using address 224.0.0.6 instead of the > >> "usual" > >> 224.0.0.5. The DR, in turn, sends the LSU to the other routers in the > >> same > >> ethernet domain. >
> > By domain, do you mean the whole AS (all the areas) or the LAN segments
> > the DR > > is directly connected to? >
> Hi, > > I mean broadcast domain. > > Regards, > Gabriele So to clarify -the correct answer is 3)to all configged routers in the OSPF area-not the AS? ALso is 224.0.0.6 for all DR routers and 224.0.0.5 for all other routers? | |||||||||||||||||||||||||||||||
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> One of the questions has two answers-but which one is correct?
>
> In a multi access Ethernet network where does a router send an LSU
> when it detects a directly connected network has failed?
>
> 1-out all interfaces to all neighbors
>
> 2-To all congfigged neighbors within the AS
>
> 3-To all configged neighbors within theOSPF area
>
> 4 -to the DR
>
> my first attempt I put 3-which was marked incorrect-I then tried again
> with 4(which is the answer it gave me) then it said the answer was 3.
> Tried looking all over for a correct answer-all help greatfully
> appreciated.
>