[c-nsp] ISIS partition avoidance

[Ivan Pepelnjak]

The router still belongs to the same area as it did before and would thus
advertise the area's prefix into L2 due to its own NET.

Remember the major difference between OSPF and IS-IS: A router (not an
interface) belongs to an area and a router (not an interface) has a NET.

Ivan
 
http://www.ioshints.info/about
http://blog.ioshints.info/

> -----Original Message-----
> From: Ibrahim Abo Zaid [mailto:ibrahim.abozaid at gmail.com] 
> Sent: Thursday, August 20, 2009 4:51 AM
> To: cisco_nsp; cisco at groupstudy.com
> Subject: [c-nsp] ISIS partition avoidance
> 
> Hi All
> 
> 
> Does any one knows why ISIS partition avoidance is needed ? 
> according to DocCD
> 
> To cause an Intermediate System-to-Intermediate System 
> (IS-IS) Level 1-2 border router to stop advertising the Level 
> 1 area prefix into the Level 2 backbone when full 
> connectivity is lost between the border router, all adjacent 
> Level 1 routers, and end hosts
> 
> 
> but that occur automatically without enabling the feature so 
> what extra benefit it provide ?
> 
> best regards
> --Ibrahim
> 
>