Re: Originating LSAs during OSPF graceful restart

[Acee Lindem <acee at CISCO.COM>]

Hi Ramesh,

Kandula, Ramesh wrote:

> Hi Acee
>
> I agree with what you said, but it didn't help me completely so let me put
> my question simple and straight-forward.
>
> 1. What is the restarting router supposed to summarize during database
> exchange while forming an adjacency with a neighbor (helper or otherwise)? 
>  
What is currently in its link state database.

> 2. Is the behavior here any different when compared to normal OSPF bring up?
>  
No.
Hope this helps,
Acee

> Thanks again
> Ramesh
>
> -----Original Message-----
> From: Acee Lindem [mailto:acee at CISCO.COM]
> Sent: Monday, February 06, 2006 10:47 AM
> To: OSPF at PEACH.EASE.LSOFT.COM
> Subject: Re: Originating LSAs during OSPF graceful restart
>
>
> Hi Ramesh,
>
> Kandula, Ramesh wrote:
>
>  
>
> > Hi Acee,
> >
> > Thanks for the reply.
> >
> > Are you saying that the restarting router should not summarize
> > self-originated lsas (I mean pre-restart self originated lsas) during
> > database exchange with a neighbor? 
> >
> >    
> No. I'm saying the restarting router will not originate new LSAs until 
> exiting
> graceful restart.
>
>  
>
> > If so, why is this required? I don't find
> > any statement in RFC3623 which implies this? 
> >
> > Also, you said if a neighbor doesn't have a pre-restart lsa, the restarting
> > router will send it. If there was an adjacency before restart with this
> > neighbor, isn't the restarting router supposed to quit restart mode? 
> >
> >
> >    
> No. In fact, a router won't act as a helper router unless it previously 
> had an adjacency with
> the restarting router.
>
> Thanks,
> Acee
>
>  
>
> > thanks
> > ramesh
> >
> > -----Original Message-----
> > From: Acee Lindem [mailto:acee at CISCO.COM]
> > Sent: Saturday, February 04, 2006 2:34 AM
> > To: OSPF at PEACH.EASE.LSOFT.COM
> > Subject: Re: Originating LSAs during OSPF graceful restart
> >
> >
> > Hi Ramesh,
> >
> > Ramesh Kandula wrote:
> >
> >
> >
> >    
> >
> > > Hi All,
> > >
> > > Should the restarting routing summarize it's own lsas (self-originated) 
> > > during adjaceny establishment? This can happen in the following scenario.
> > >
> > > Suppose there are 3 OSPF routers on a broadcast network and the DR 
> > > restarts. When it establishes adjacency with the first neighbor, it will 
> > > get its own lsas from it. Now while forming adjaceny with the second 
> > > neighbor, should it summarize it's own lsas?
> > >
> > >
> > >   
> > >
> > >      
> > No.
> >
> >
> >
> >    
> >
> > > If yes, then the neighbor will request for them and the restarting router 
> > > will send these lsas. So does the RFC 3623 mean that the restarting router
> > >      
>
>  
>
> > > should not originate "newer" instances of lsas of type 1,5 or 7? 
> > >
> > >
> > >   
> > >
> > >      
> > If the neighbor doesn't already have them (and normally it will), the 
> > restarting router will send its
> > pre-restart LSAs. Don't confuse origination with sending an LSA during 
> > the database exchange
> > process.
> >
> > Hope this helps,
> > Acee
> >
> >
> >
> >    
> >
> > > Thanks in advance
> > > ramesh
> > >
> > >
> > >
> > >   
> > >
> > >      
> >
> >
> >    
>
>