From: Peter Svidler (doubleccie@yahoo.com)
Date: Sun Mar 15 2009 - 13:43:53 ART
when you apply ISIS process with multiple NET command configured on certain
interface , all the Areas under this process will be assigned to this
interface ..in other words the router will be able to form adj with neighbors
if any of the areas are configured on the neighbor ( assuming L1 here since
with Level2 the area matching is not a restriction )
assume you have 3 routers R1 ----R2 ----R3 and assume all L1
R1 is area 1 , and R3 on area 3 , now on R2 you can configure two NET command
for A1 and A3 , apply the process on R2 both interfaces .
you will be able in this case to form adj. wth both R1 and R3 , the prefixes
will be also leaked between the two areas .
--- On Sun, 3/15/09, Nitin Venugopal <nitinsworld@gmail.com> wrote:
From: Nitin Venugopal <nitinsworld@gmail.com>
Subject: Re: ISIS multi-area
To: doubleccie@yahoo.com
Cc: "Fahad Khan" <fahad.khan@gmail.com>, ccielab@groupstudy.com
Date: Sunday, March 15, 2009, 8:40 AM
Even if you apply multiple net under single process, how will you know which
interface is part of which area- Unless you bind the area with the Interface.
ISIS process can be binded with specific interface , but you are not allowed
to add more isis process
Regds
Nitin
On Sun, Mar 15, 2009 at 4:34 PM, Peter Svidler <doubleccie@yahoo.com> wrote:
the trick in my question was that i was expecting the command to look like
redistribute isis (tag) ip level-2 into level-1 distrbuite-list 100
however the ( tag ) is not required , probably because you can run only one
level 2 process on the router but not sure .
to comment on your answer , L1 router can accept redistribution from level2
(typically this redistibution will be on L1/2 router ) , the prefixes will
appear as IA in the L1 router
to run multi-area on single interface , you have to put multiple NET commands
under the same process , this scenarios is used for migration purposes .
--- On Sun, 3/15/09, Nitin Venugopal <nitinsworld@gmail.com> wrote:
From: Nitin Venugopal <nitinsworld@gmail.com>
Subject: Re: ISIS multi-area
To: "Fahad Khan" <fahad.khan@gmail.com>
Cc: "Peter Svidler" <doubleccie@yahoo.com>, ccielab@groupstudy.com
Date: Sunday, March 15, 2009, 6:15 AM
FYI-L1 is NSSA (eq OSPF) by default
ie it allows redistribtion, if it was totally stubby it wont allow
redistribution
L1 only intraarea
L2 can be Inter Area or Intra Area
L1/L20 is like ABR in OSPF
i have one question. How can you have multiple interface be part of
different ISIS area's . But with single ISIS process.
*Say R1 *
Eth 0/0 to be part of 49.4004 and Eth 0/1 be part of 49.4008. But only one
process allowed is on the router 'router isis 10'
And how will you differentiate which interface is part of which area?
Regds
Nitin
On Sun, Mar 15, 2009 at 2:03 PM, Fahad Khan <fahad.khan@gmail.com> wrote:
> I am sure you are talking about route leaking, since areas having L1
> routers
> are totally stubby by default. So you need to have route leaking
configured
> to inject specific L2 routes.
>
> You do it by
>
> redistribute isis ip level-2 into level-1 distribute-list <list
defining L2
> specific routes>
>
> regards,
>
> On Sun, Mar 15, 2009 at 11:40 AM, Peter Svidler <doubleccie@yahoo.com
> >wrote:
>
> > Guys ,
> >
> > is it possible on a router that is running multiple instances of
ISIS to
> > redistribute one into another ?
> >
> > assume i have router with one process L2 and another process L1 , i
want
> to
> > redistribute the L2 process into the L1 process so that the
downstream
> sees
> > the explicit route ...however when i try redistribution under the
ISIS
> L1
> > process i get Unrecognized command !!!! is this even possible ( seems
yes
> )
> > but what am i missing here? ( AREA1 is created already )
> >
> > router isis
> >
> > R1(config-router)#redistribute isis ?
> > WORD ISO routing area tag
> > ip Redistribution of IP routes between levels
> > !(config-router)#redistribute isis AREA1 ?
> > % Unrecognized command
> >
> >
> >
> >
> > anyone sees something similar ?
> >
> >
> >
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:05 ART