BSCI – IS-IS Pt.3

What are the 3 main parts that make up a network entity title (NET) address?
1. The area address (prefix), which identifies the area that the rtouer is a part of 2. The system ID, which uniquely identifies each device.

 3. The NSEL, which must be 0 

Why can it be difficult to troubleshoot IP address misconfiguration with IS-IS?
The IS-IS neighbor relationships are established over OSI CLNS, not over IP. Because of this approach, 2 ends of a CLNS adjacency can have IP addresses on different subnets, with no impact on the operation of IS-IS.
What command is used to enable CLNS routing on a router set to use IS-IS?
clns routing
By default, at what level does an IS-IS router run at?
By default, the Cisco IOS makes the router an L1/L2 router.
What command is used to specify the level that the IS-IS router will operate at?
is-type {level-1 | level-1-2 | level-2-only}
What command is used to configure an interface to only send out hello messages in regards to it operating level?
isis circuit-type {level-1 | level-1-2 | level-2-only}
What command is used to change the default metric of an interface running IS-IS?
isis metric metric [delay-metric [expense-metric[error-metric]]]{level-1 | level-2}
What 4 different types of metrics can be used with IS-IS?
1. Cost, which is the default 2.

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Delay, which measures transit delay 3. Expense, which measures the monetary cost of link utilization 4. Error, which measures residual error probability associated with a link. 

What command can be used to change the default metric value for all IS-IS interfaces on a router?
metric default-value {level-1 | level-2}
What command is used to create summary addresses on routers that are running IS-IS?
summary-address address netmask [level-1 | level-2 | level-1-2] [tag tag-number] [metric metric-value]
What is the default level of a summarized route on a router that is running IS-IS?
The default level is a L2 route.
What command is used to display general information about the CLNS network?
show clns
What command is used to display information for the specific IS-IS processes in the router?
show clns [area-tag] protocol
What command is used to display information about the interfaces that currently run CLNS?
show clns interface [type number]
What command is used to display IS and ES neighbor information?
show clns [area-tag] neighbors [type number] [detail]
What command is used to display the IS-IS L1 routing table?
show isis [area-tag] route
What command is used to display the IS-IS L2 routing table?
show clns route [nsap]
What command is used to display the contents of the IS-IS LSDB?
show isis [area-tag] database
What command is used to display the L1 and L2 topology tables?
show isis [area-tag] topology