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ISO IDRP Standards Documents


ISO IDRP Document

The ISO IDRP document's name is:

"Information Processing Systms - Telecommunicatons and Information Exchange between
Systems - Protocol for Exchange of Inter-domain Routeing INformation among Intermediate
Systems to Support Forwarding of ISO 8473 PDUs."

Other ISO related documents that you may find of interest are:



Another document of historical interest is a document on interaction between IS-IS and IDRP to allow autoconfiguration of nodes to start at a node, and spread to IS-IS, and into IDRP. It was a contribution to ANSI X3S3.3 in 1993. (auto-idrp )

IETF IDRP Standards Documents

  1. IDRP for IP Version 6
  2. IDRP/BGP interaction with OSPF
  3. IDRP MIB


Important IDRP Concepts

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IDRP Path Attributes

IDRP path attributes allow certain pieces of information to be tagged to a set of reachable NLRI prefix (or in IETF language CIDR address). The path attributes include the routing domain pathway, next hop router information, and quality of services. The path attributes are:

  1. ROUTE_SEPARTOR (1)
  2. EXT_INFO(2)
  3. RD_PATH (3)
  4. NEXT_HOP (4)
  5. DIST_LIST_INCL (5)
  6. DIST_LIST_EXCL (6)
  7. MULTI_EXIT_DISC (7)
  8. TRANSIT_DELAY (8)
  9. RESIDUAL ERROR(9)
  10. EXPENSE (10)
  11. Locally Defined QOS(11)
  12. Hierarchical Recording (12)
  13. RD_HOP_COUNT (13)
  14. SECURITY (14)
  15. CAPACITY (15)
  16. PRIORITY (16)

IDRP Phases of Processing

IDRP Phase 1

Reception of Routes from peers. Preference is assigned to routes and external routes are transmitted to internal peers.

IDRP Phase 2

Routes from all the peers are assigned a preference. Tied preferences are settled.

IDRP Phase 3

Internal and External routes are exported to external peers. Local routes are exported to internal and external peers.

IDRP Definitions

  1. BISPDU Border Intermediate System Protocol Data Unit or IDRP packet
  2. route-id Grouping of NLRI in 1 BISPDU. (Routes are withdrawn by Route_id)