From: Pita40 (pita40@hotmail.com)
Date: Fri Jun 20 2003 - 10:48:54 GMT-3
From cco
A maximum of three NETs per router are allowed. In rare circumstances, it is
possible to configure two or three NETs. In such a case, the area this
router is in will have three area addresses. There will still be only one
area, but it will have an additional maximum of three area addresses.
Configuring multiple NETs can be temporarily useful in the case of network
reconfiguration where multiple areas are merged, or where one area is split
into additional areas. Multiple area addresses enable you to renumber an
area individually as needed.
If you are configuring multiarea IS-IS, the area ID must be unique, but the
system ID portion of the NET must be the same for all IS-IS routing process
instances.
Examples
The following example configures a router with system ID 0000.0c11.1111.00
and area ID 47.0004.004d.0001:
router isis CHESNUT
net 47.0004.004d.0001.0001.0c11.1111.00
The following example shows three IS-IS routing processes with three areas
configured. Each area has a unique identifier, but the system ID is the same
for all areas.
clns routing
.
.
.
interface Tunnel529
ip address 10.0.0.5 255.255.255.0
ip router isis BB
clns router isis BB
interface Ethernet1
ip address 10.1.1.5 255.255.255.0
ip router isis A3253-01
clns router isis A3253-01
!
interface Ethernet2
ip address 10.2.2.5 255.255.255.0
ip router isis A3253-02
clns router isis A3253-02
.
.
.
router isis BB ! Defaults to "is-type level-1-2"
net 49.2222.0000.0000.0005.00
!
router isis A3253-01
net 49.0553.0001.0000.0000.0005.00
is-type level-1
!
router isis A3253-02
net 49.0553.0002.0000.0000.0005.00
is-type level-1
----- Original Message -----
From: "SHARMA,MOHIT (HP-Germany,ex1)" <mohit.sharma@hp.com>
To: "'Pita40'" <pita40@hotmail.com>; <ccielab@groupstudy.com>
Sent: Friday, June 20, 2003 9:43 AM
Subject: RE: isis multi area
> Hi there,
>
> As per my understanding a router in as ISIS area can only be in 1 and only
> one area, The area border routers are only at the links and form L2
> adjacencies. Also generally after specifying a NET id you cannot add
> another.
>
> Maybe you should refer to Jeff Doyle's book, that is one of the best
> resources I found for ISIS.
> Smiles,
>
> Mohit.
>
> -----Original Message-----
> From: Pita40 [mailto:pita40@hotmail.com]
> Sent: Friday, June 20, 2003 3:29 PM
> To: ccielab@groupstudy.com
> Subject: isis multi area
>
>
> I am still not clear on how to specify multiple area in isis
> Do you need for example
>
> router isis Finance
>
> or
>
> is the net command where the area specification is done like
>
> router a
> router isis
> net 49.0553.0001.0000.0000.0005.00
>
> router isis
> net 49.0553.0002.0000.0000.0005.00
>
> interface Ethernet0
> ip router isis
>
> interface Ethernet2
> ip router isis
>
> Also will to connected router in isis need to be in the same area like in
> ospf.
>
> Please help with example. The examples in cco for multi area does not have
> multiple router that are running isis.
>
>
> P
>
>
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