Trouble with inter and intra area filtering between two areas.

[Ondrej Zajicek]

On Tue, Dec 15, 2015 at 05:38:11AM +0100, LU wrote:
> Hello.
> 
> Here's my setup with 4 routers:
> 
>    area 0
>     /     \
> R1 ---- R2
> |              |
> |              |
> R3 ------ R4
>  \  area1 /
> 
> What I am trying is to prevent routes that fall in 10.0.0.0/8 range from
> being announced from Area 1 routers (R3, R4) to Area 0 routers (R1, R2). At
> the same time I want Area 1 routers (R3, R4) to exchange these routes
> between themselves.
> 
> I thought that I could achieve it by using "networks { 10.0.0.0/8 hidden;
> };" in Area 1 routers configs. Documentation says: "Hidden networks are not
> propagated into other areas." It does indeed prevent annoucement to Area 0
> routers from Area 1, but at the same time it also filters these routes out
> between Area 1 routers (R3, R4) which is not what I want, I expected it not
> getting filtered from Area 1 routers. (Since they are the same area).
> 
> Is there any way I can filter 10.0.0.0/8 from reaching Area 0 from Area 1,
> but at the same time keep such routes announced between Area 1 routers?

Hi

Such config should work as you expected (i.e. routes are propagated
inside Area 1, but are not translated to summary LSAs for Area 0).
Could you send me output of 'show route' and 'show ospf state'?

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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