Re: Connecting ISIS Level-1 Router To Multiple Level-1-2 in

I tried this on both IOS and Junos and it worked. I'm not quite sure
of your approach... Some code-sharing would be nice for us to be able
to help better.

In reality, all you have to do is to make sure your L1/L2 routers have
multiple NET addresses of which one is in L1 and other in L2.

--
Marko Milivojevic - CCIE #18427 (SP R&S)
Senior CCIE Instructor - IPexpert
On Mon, Oct 1, 2012 at 8:17 AM, Edmore Chingwena <chingwenaed_at_gmail.com> wrote:
> Hi Experts
>
> I have a question I wish to check. What will be the best way to connect a
> Level-1 router to Multiple Level-1-2 routers in different  IS-IS areas.
> Defaultly this not possible but wish to check if anyone has used some
> stupid router tricks to get this to work or there is an RFC or draft.
> Something I have tested  is using multiple processes and redistributing on
> one of the L1/2 routers  at one point with a route-policy.
>
> Redistribution will be last resort wanted to check if there are any other
> alterves in a multivendor environment where the L1 router is most likely
> not cisco and 90% chance that one of the L1/L2 is also not Cisco.
>
> Example
>
> R1 is L1 R2 is L1/2 and R3 is L1/2
>
> R1  is hard-coded as L1 connects to R2 and R3 and is running IS-IS Level-1
> to the two
>
> Example Area design
>
>  R1 49.0001.0100.0000.1111.00
>  R2 49.0001.0100.0000.2222.00
>  R3 49.0003.0100.0000.3333.00
>
> The requirements I have are the same as what Cisco calls multi-area ISIS
>  but seems not to work with some of  the codes I have in my current
> environment in a test environment as well.
>
>
> Regards
> Edmore Chingwena
> CCIE#36714 SP
>
>
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