Intermediate System to Intermediate System | 487
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Intermediate System to Intermediate System
Intermediate System to Intermediate System is supported on platforms e z
IS-IS is supported on the E-Series ExaScale platform with FTOS 8.1.1.0 and later. It is supported on the
with FTOS 8.3.10.0 and on Z9000 with FTOS 9.0.0.0.
Intermediate System to Intermediate System (IS-IS) protocol is an interior gateway protocol (IGP) that
uses a shortest-path-first algorithm. Dell Force10 supports both IPv4 and IPv6 versions of IS-IS, as it is
detailed in this chapter.
• Protocol Overview on page 487
• IS-IS Addressing on page 488
• Multi-Topology IS-IS on page 489
• Graceful Restart on page 490
• Implementation Information on page 491
• Configuration Information on page 492
• IS-IS Metric Styles on page 511
• Sample Configuration on page 515
IS-IS protocol standards are listed in the Chapter 50, Standards Compliance chapter.
Protocol Overview
The intermediate-system-to-intermediate-system (IS-IS) protocol, developed by the International
Organization for Standardization (ISO), is an interior gateway protocol (IGP) that uses a shortest-path-first
algorithm.
IS-IS is organized hierarchally into routing domains, and each router or system resides in at least one area.
In IS-IS, routers are designated as Level 1, Level 2 or Level 1-2 systems. Level 1 routers only route traffic
within an area, while Level 2 routers route traffic between areas. At its most basic, Level 1 systems route
traffic within the area and any traffic destined for outside the area is sent to a Level 1-2 system. Level 2
Note: This protocol supports routers passing both IP and OSI traffic, though the Dell Force10
implementation supports only IP traffic.
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