P.S. is it mistake about IS-IS default policy - that IS-IS rejected by default learned routes from direct protocol? Check this link http://img843.imageshack.us/img843/3264/isisdefaultpolicy.png
I think its must be accepted, and also in the next term we have the same reject action... -- AA 2009/12/4 Akhmedd Aly <[email protected]> > Hi, > > can someone explain this difference between this 1-12 steps order in case > of internal/external metric > > Each IS-IS router translates the information in the database into usable > routes by implementing the > Shortest Path First (SPF) algorithm. This computation is performed > separately within each IS-IS > level, and the results are compiled together and presented to the routing > table on the router. The > algorithm locates the metrically shortest path to each unique destination > in the network. On occasion, > the result of the calculation encounters multiple paths to the same > destination learned through > different means. To decide which path to use, the protocol has some > tie-breaking rules to follow. The > order of precedence for using a route is: > 1. Level 1 intra-area routes with an internal metric > 2. Level 1 external routes with an internal metric > 3. Level 2 intra-area routes with an internal metric > 4. Level 2 external routes with an internal metric > 5. Inter-area routes (Level 1 to Level 2) with an internal metric > 6. Inter-area external routes (Level 1 to Level 2) with an internal metric > 7. Inter-area routes (Level 2 to Level 1) with an internal metric > 8. Inter-area external routes (Level 2 to Level 1) with an internal metric > 9. Level 1 external routes with an external metric > 10. Level 2 external routes with an external metric > 11. Inter-area external routes (Level 1 to Level 2) with an external metric > 12. Inter-area external routes (Level 2 to Level 1) with an external metric > > > Is it just meaning that ISIS protocol has two different preferences for > each level: > IS-IS Level 1 Internal Intermediate System to Intermediate System Level 1 > internal routes 15 > IS-IS Level 2 Internal Intermediate System to Intermediate System Level 2 > internal routes 18 > IS-IS Level 1 External Intermediate System to Intermediate System Level 1 > external routes 160 > IS-IS Level 2 External Intermediate System to Intermediate System Level 2 > external routes 165 > > > TIA! > > -- > AA > _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
