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Chapter 5
Setup and Configuration
Section 5.18.1.3
Advantages and Disadvantages of Using IS-IS
The advantages and disadvantages of using IS-IS include the following:
Advantages
• runs natively on the OSI network layer
• can support both IPv4 and IPv6 networks due to it's
independence from IP addressing
• IS-IS concept of areas is simpler to understand and
implement
• IS-IS updates grouped together and sent as one LSP,
rather than several small LSAs as with OSPF
• better scalability than OSPF due to a leaner daemon
with less overhead
• gaining popularity among service providers
• integrates with MPLS
• protects from spoofing and Denial of Service (DoS)
attacks due to use of the data link layer
Section 5.18.2
Configuring IS-IS
To configure dynamic routing with IS-IS, do the following:
1.
Make sure the CLI is in Configuration mode.
2.
Enable IS-IS by typing:
routing isis enabled
3.
Associate the device with one or more areas in the IS-IS network by defining area tags. For more
information, refer to
4.
Configure one or more interfaces on which to perform IS-IS routing. For more information, refer to
Section 5.18.6, "Managing
Type commit and press Enter to save the changes, or type revert and press Enter to abort.
5.
Example
The following illustrates how to configure an IS-IS network that includes all circuit types. In this example, R1 is a
Level-1 router that needs to forward traffic to Level-2 routers. R2 and R3 are configured to be Level-1-2 routers to
facilitate the connection with routers R4 and R5, which are Level-2-only routers. Each router is configured to have
a non-passive interface, use point-to-point network communication, and be in the same area.
296
Section 5.18.5, "Managing Area
Interfaces".
Disadvantages
• used mostly by service providers
• limited support by network stack vendors and
equipment makers
• CLNP addressing can be new and confusing to many
users
Tags".
Advantages and Disadvantages of Using IS-IS
RUGGEDCOM ROX II
CLI User Guide
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Table of Contents
Troubleshooting
