From: CCIE Candidate (ccie2001ca@xxxxxxxx)
Date: Fri Dec 07 2001 - 23:48:00 GMT-3
It works when L1 and L2 are in different areas. Is it
possible to have different levels (L1 and L2) in the
same area ? because it doesn't work when all L1,L2 and
L1/L2 are in the same area
KJ
--- Craig King <cking007@hotmail.com> wrote:
> AFAIK, your statement is correct (I'm far from an
> expert on ISIS). The ATT
> (attached) bit is only set to 1 when it has formed
> an adjacency with another
> L2 router (and hence has connectivity to the
> backbone). Only then can a
> default route be advertised to the L1 routers in the
> area.
>
> HTH,
> Craig
>
>
> >From: Jim Brown <Jim.Brown@CaseLogic.com>
> >Reply-To: Jim Brown <Jim.Brown@CaseLogic.com>
> >To: "'Craig King'" <cking007@hotmail.com>,
> ccie2001ca@yahoo.ca
> >CC: ccielab@groupstudy.com
> >Subject: RE: ISIS L1 router's default route
> >Date: Thu, 6 Dec 2001 10:44:02 -0700
> >
> >This explains something I have been struggling
> with. I knew about the
> >default advertisement and clns on the interface,
> but I was unaware of the
> >need for an L2 adjacency for the advertisement of
> the default route.
> >
> >Please clarify/validate my statement....... An
> L1/L2 router will not set
> >the
> >ATT bit unless it has formed and adjacency with
> another L2 router?
> >
> >-----Original Message-----
> >From: Craig King [mailto:cking007@hotmail.com]
> >Sent: Thursday, December 06, 2001 8:52 AM
> >To: ccie2001ca@yahoo.ca
> >Cc: ccielab@groupstudy.com
> >Subject: Re: ISIS L1 router's default route
> >
> >
> >A default route is automatically generated by the
> L1/L2 router when it has
> >established an adjacency with another L2 router.
> Once the L2 adjacency is
> >created, the L1/L2 router knows that the backbone
> area is reachable and can
> >default L1 traffic into it. No need to use
> "default-information
> >originate".
> >
> > I'm only using "ip router isis" on the
> interfaces, so I doubt that "clns
> >router isis" is needed either.
> >
> >HTH,
> >Craig
> >
> > >From: "Clarke J" <clark.j@163.com>
> > >Reply-To: "Clarke J" <clark.j@163.com>
> > >To: "CCIE Candidate" <ccie2001ca@yahoo.ca>
> > >CC: "CCIE-Groupstudy" <ccielab@groupstudy.com>
> > >Subject: Re: ISIS L1 router's default route
> > >Date: Thu, 6 Dec 2001 09:54:57 +0800
> > >
> > >I think you'd better configure " clns router isis
> " under interface .
> > >
> > >----- Original Message -----
> > >From: "CCIE Candidate" <ccie2001ca@yahoo.ca>
> > >To: <ccielab@groupstudy.com>
> > >Sent: Thursday, December 06, 2001 08:55
> > >Subject: ISIS L1 router's default route
> > >
> > >
> > > > Hello group:
> > > >
> > > > I 've read in the documents that L1/L2 router
> acts as
> > > > a default gateway for all L1 routers, but i
> could not
> > > > make it work. Infact, there is no default
> route in the routing
> > > > table. One way I can think of is to use
> > > > "default-information-originate" but what
> needs to be done to use
> > > > the ATT bit advertised by L1/L2 routers ?
> > > >
> > > > Thanks in advance
> > > >
> > > > KJ
> > > >
> > > >
>
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