both Any redistribution of other route
sources Information about the distances for Level 2
CLNS routes and the acceptance and generation of metrics
In Figure , the example output from the show clns
neighbors command shows this information: - IS-IS
neighbors
- SNPAs and state
- Hold time, which is
the timeout for receipt of no hellos, after which the neighbor
is declared down
- Neighbor level type
Also
in this figure, the example of output from the show clns
interface command shows this information:
- Interface is running IS-IS and is attempting to establish
Level 2 adjacencies
- Interface numbers and circuit ID
for IS-IS purposes
- ID of the neighbor.
- Metric
or metrics for the interface.
- Priority for Designated
IS (DIS) negotiation, which is not relevant in this case
because it is a serial HDLC interface
- Information
regarding hello timers and the number of established
adjacencies
- State of the interface
Content 4.7 IS-IS Lab Exercises
4.7.1 Lab 4-1 Configuring Basic Integrated IS-IS
Lab Activity
Lab Exercise: Lab 4-1
Configuring Basic Integrated IS-IS
The IS-IS
routing protocol has become increasingly popular with
widespread usage among service providers. The International
Travel Agency (ITA) is considering implementing IS-IS because
it is a link state protocol that enables very fast convergence
with large scalability and flexibility. But before making a
final decision, management wants a non-production network set
up to test the IS-IS routing protocol. The backbone of the
production ITA WAN consists of three routers connected by an
Ethernet core. Because the routers are also connected to the
Internet, authentication is needed to prevent unauthorized
routers from participating in the IS-IS process.
- Configure and verify the operation of Integrated IS-IS on a
router
- Configure a NET identifying a domain, area, and
intermediate system
- Configure and verify Level 1 and
Level 2 IS-IS adjacencies
- Verify and understand the
IS-IS topology table
- Manipulate IS-IS adjacency
timers
- Implement IS-IS domain and link
authentication
Content 4.7
IS-IS Lab Exercises 4.7.2 Lab 4-2 Multi-Area
Integrated IS-IS Lab Activity
Lab
Exercise: Lab 4-2 Multi-Area Integrated IS-IS
Previous tests demonstrated that Integrated IS-IS works
well with Level 2 routers in the International Travel Agency
(ITA) Ethernet core. Management now wants to establish a
point-to-point connection between a new R3 office and R1. R3 is
in a different area from the core, so R2 will now be configured
as an L1 router, R1 as an L1-L2 router, and R3 as an L2
router. Start with the final configurations for R1 and R2 from
the first IS-IS lab. - Configure multi-area integrated
IS-IS
- Review configuration of IS-IS Level 1 and Level
2 intermediate systems
- Verify IS-IS adjacencies and
view the IS-IS database
- Review IS-IS domain
authentication
- Verify intra-area IS-IS operation
Content 4.7 IS-IS Lab
Exercises 4.7.3 Lab 4-3 Configuring IS-IS over
Frame Relay Lab Activity
Lab Exercise:
Lab 4-3a Configuring IS-IS over Frame Relay: Router
Used As Frame Switch
International Travel Agency
has just connected two regional offices to the headquarters
using Frame Relay in a hub-and-spoke topology. You are asked to
configure IS-IS routing over this network. - Configure
and verify Frame Relay point-to-point subinterfaces
- Configure and verify the operation of Integrated IS-IS over
Frame Relay point-to-point subinterfaces
- Demonstrate
mismatched Frame Relay interface types in IS-IS
adjacencies
Lab Activity
Lab
Exercise: Lab 4-3b Configuring IS-IS over Frame Relay:
Adtran Used As Frame Switch
International Travel
Agency has just connected two regional offices to the
headquarters using Frame Relay in a hub-and-spoke topology. You
are asked to configure IS-IS routing over this network.
- Configure and verify Frame Relay point-to-point
subinterfaces
- Configure and verify the operation of
Integrated IS-IS over Frame Relay point-to-point
subinterfaces
- Demonstrate mismatched Frame Relay
interface types in IS-IS adjacencies
Content
Summary CLNS provides connectionless delivery of data.
As a result, CLNS is the solution for unreliable delivery of
data, similar to IP. IS-IS operates in strictly CLNS terms,
although Integrated IS-IS supports IP routing as well as CLNS.
IS-IS supports different data-link environments, such as
Ethernet and Frame Relay. IS-IS is a versatile routing protocol
used in many very large ISPs. The natural scalability of IS-IS
makes it a great choice for modern large-scale IGP network
deployments. IS-IS uses the SPF algorithm, just as OSPF, but
requires less SPF calculations as a result of its ability to
handle PRCs. The following was learned in this module:
- CLNS addressing
- IS-IS operation in a CLNS
environment
- Types and functions of PDUs in IS-IS
routing
- Integrated IS-IS operation in an IP and CLNS
environment
- Integrated IS-IS in an NBMA
environment
- Configuration of IS-IS in single and
multiple areas, L1 and L2 circuit types, and route
summarization
- Monitoring an Integrated IS-IS network
with show and debug commands