Re: draft-kou-ospf-immediately-replying-hello-00.txt

[Acee Lindem <acee at CISCO.COM>]

Hi Zengjie,

Zengjie Kou wrote:

> Hi,Acee,
>    If a router interface whose role is changed(e.g.DR goes down), the router will notify all routers about the change by immediate hello.
>  
This is only when the DR/BDR knows that it is going down or the case 
where the router
priority is set to 0.

For a router becoming DR/BDR, all the routers should elect the same DR/BDR
so I don't see how it helps.

Thanks,
Acee

> After all router get the change, election will be reprocessed. In contrast to normal hello, immediate hello avoid the backupSeen.
> Namely, improving convergence.
>
> Thanks a lot,
> Zengjie
>
> ----- Original Message ----- 
> From: "Acee Lindem" <acee at CISCO.COM>
> To: <OSPF at PEACH.EASE.LSOFT.COM>
> Sent: Saturday, February 18, 2006 5:17 AM
> Subject: draft-kou-ospf-immediately-replying-hello-00.txt
>
>
>  
>
> > Hi Zengjie,
> >
> > Under what situations does having the router who changed to/from
> > DR/BDR improve convergence (section 6.2)? Since DR/BDR election
> > is a distributed algorithm dependent on the calculating routers state, it
> > seems this won't help in all that many cases.
> >
> > Thanks,
> > Acee
> >    
>
>