From: Peter van Oene (pvo@usermail.com)
Date: Fri Jun 20 2003 - 13:02:18 GMT-3
At 04:18 PM 6/20/2003 +0200, SHARMA,MOHIT (HP-Germany,ex1) wrote:
>Hmmm that comes quite as a surprise, as in his book Jeff Doyle specifically
>states that the router can be a aprt of ONLY 1 Area in ISIS. I remember
>reading it also in some other books.
Keep in mind that an "area" can have multiple area addresses.
>I believe a lot of ISP's are using it a lot, maybe some of the poeple with
>real life experience can shed some LIGHT here.
>-----Original Message-----
>From: Pita40 [mailto:pita40@hotmail.com]
>Sent: Friday, June 20, 2003 3:49 PM
>To: SHARMA,MOHIT (HP-Germany,ex1); ccielab@groupstudy.com
>Subject: Re: isis multi area
>
>
> 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
> >
> >
> > _______________________________________________________________________
> > You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
> >
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
>_______________________________________________________________________
>You are subscribed to the GroupStudy.com CCIE R&S Discussion Group.
>
>Subscription information may be found at:
>http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Jul 04 2003 - 11:11:04 GMT-3