Last night at our BSCN study group meeting in Dallas we had some questions
about OSPF that we weren't able to resolve. If someone or ones could answer
these it would clarify some areas we're a little fuzzy on. Also, if you're
iin the Dallas Ft. Worth area and would like to attend, we'd love to hav
CTED]
Subject: Some OSPF Questions
Last night at our BSCN study group meeting in Dallas we had some questions
about OSPF that we weren't able to resolve. If someone or ones could answer
these it would clarify some areas we're a little fuzzy on. Also, if you're
iin the Dallas Ft.
Comments inserted below.
>1) What is the default time period that the BDR waits when listening to
>LSA's from the DR before it decides that the DR is down and promotes itself
>to DR. All the literature we could find simply said that the BDR waits for
>the specified time period but never said wha
On Fri, 10 Nov 2000, David Armstrong wrote:
> Last night at our BSCN study group meeting in Dallas we had some questions
> about OSPF that we weren't able to resolve. If someone or ones could answer
> these it would clarify some areas we're a little fuzzy on. Also, if you're
> iin the Dallas Ft.
t;
> -Original Message-
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of David
> Armstrong
> Sent: Friday, November 10, 2000 8:46 AM
> To: [EMAIL PROTECTED]
> Subject: Some OSPF Questions
>
> Last night at our BSCN study group meeting in Dallas we ha
David,
It appears you have received conflicting guidance on your
question...I'll throw my 2 cents in but I hope I don't add to the
confusion:
1) RouterDeadInterval is the legth of time a router waits for a Hello
packet from a neighbor before declaring it down...the same timer is used
by t
At 9:49 AM -1000 11/10/2000, Frank B. wrote:
>
>3) I've never had a need to use 2 OSPF process but Someone already
>stated it being used to transition/migrate and that seems
>reasonable...but keep in mind you'd have duplicate everything! I would
>imagine the strain on resources, say for the netwo
tes
from me but I did not learn from them. That is pretty common I think.
-Original Message-
From: Brian [mailto:[EMAIL PROTECTED]]
Sent: Friday, November 10, 2000 11:28 AM
To: Matthew Herman
Cc: David Armstrong; [EMAIL PROTECTED]
Subject: RE: Some OSPF Questions
On Fri, 10 Nov 2000, M
On Fri, 10 Nov 2000, Matthew Herman wrote:
>
> >You ran OSPF to customers? So you were selling them transit and used
> >OSPF? I imagine the evil a customer could do to your network if they had
> > access to an OSPF neighbor router.
>
> I did not say it was bright. They had multiple T-1's
ct?
>
> Thanks,
>
> David Armstrong
>
> -Original Message-
> From: Frank B. [mailto:[EMAIL PROTECTED]]
> Sent: November 10, 2000 1:49 PM
> To: David Armstrong
> Cc: [EMAIL PROTECT
24 AM
To: David Armstrong; [EMAIL PROTECTED]
Subject: Re: Some OSPF Questions
You couldn't be more right! I jumped the gun. My response to your
question 1) was incorrect. The BDR to Dr transition doesn't use the
Hello protocol. The BDR listens to the LSAs from other routers
(non-DR/BD
ay that this is
not what happens.
Chuck
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
Matthew Herman
Sent: Friday, November 10, 2000 9:56 AM
To: David Armstrong; [EMAIL PROTECTED]
Subject: RE: Some OSPF Questions
I'll throw my hat in.
question on any test.
Winston.
-Original Message-
From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
Sent: Saturday, November 11, 2000 8:39 PM
To: Matthew Herman; David Armstrong; [EMAIL PROTECTED]
Subject: RE: Some OSPF Questions
Just to put in some empirical data, I set up two routers on an
If you look at the RFC, I believe there are only BDR elections. When a new
segment comes up, a BDR is elected, then promoted to DR, then the BDR is
elected again.
Ed
> Of some interest - the debug ip ospf hello and debug ip ospf events were
> silent immediately after unplugging the DR. It was o
LSAs or hello packets determine when the BDR takes over for the
> dead DR. I hope they never ask this question on any test.
>
> Winston.
>
> -Original Message-
> From: Chuck Larrieu [mailto:[EMAIL PROTECTED]]
> Sent: Saturday, November 11, 2000 8:39 PM
> To: Matth
This has been an awesome thread to me. Thanks everyone for the input.
Evidently I'm not alone in being confused over BDR to DR promotion. The
books and literature I've found have clearly stated that the event to
promote BDR's to DR's is a missed LSA; however, the tests here show
otherwise. Winsto
"David Armstrong" <[EMAIL PROTECTED]> wrote,
>This has been an awesome thread to me. Thanks everyone for the input.
>Evidently I'm not alone in being confused over BDR to DR promotion. The
>books and literature I've found have clearly stated that the event to
>promote BDR's to DR's is a missed L
If you look at page 432, Table 9.1 in Doyle's "Routing TCP/IP" for the OSPF
interface state machine, you will see clearly that one of the events (6). is
"the expiration of the RouterDeadInterval without having received a Hello
from the DR or the BDR or both", which changes directly to the DR/BDR
e
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