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Adjusting juniper IS-IS Link Costs
 
You want to direct traffic within an IS-IS area toward a particular router.
Increase the cost on one of the IS-IS interfaces to force traffic to use a lower-cost interface:
 
[edit protocols isis]
source@RouterA# set interface ge-0/0/1.0 level 2 metric 30

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Juniper Redistributing BGP Routes into IS-IS
 
You have a single, low-speed link to a small customer and instead, of having the customer run IS-IS (or even bgp), you want to set up a bgp route to the customer.
Create a routing policy to redistribute bgp routes into IS-IS:
 
[edit policy-options]

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How to Trace IS-IS Protocol Traffic in Juniper
 
You are setting up IS-IS on your network and want to keep a running log of IS-IS protocol packets that the router is sending to help you track any problems that might occur during the configuration process.
Set up a tracing file that captures information about IS-IS protocol operations:
 
[edit protocols isis]

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Juniper Configuring IS-IS
 
 
 
You want to configure IS-IS on a JUNOS router.
There are three steps to setting up IS-IS. First, define the interfaces on which IS-IS will run and the levels to which the interfaces will be attached.
 
[edit protocols isis]

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Juniper Controlling DIS Election
 
You want to force IS-IS to use a specific router as the designated router.
Increase the priority on the desired router:
 
[edit protocols isis]

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Juniper Enabling IS-IS Authentication
 
You want to ensure that all IS-IS protocol traffic that your router accepts comes from devices known to you so that only trusted routers participate in determining the contents of the IS-IS routing database.
Configure MD5 authentication for IS-IS:
 
[edit protocols isis]

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Juniper Redistributing Static Routes into IS-IS
 
You have a single, low-speed link to a small customer and instead, of having the customer run IS-IS (or even RIP), you want to set up a static route to the customer.
Create a routing policy to redistribute static routes into IS-IS:
 
[edit policy-options]

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Show the IS-IS Link-State Database
 
You want to look at each router's link-state database to make sure that all the IS-IS routers know about each other.
Use the show isis database command to view the contents of the link-state database:
 
source@RouterA> show isis database

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Juniper Disabling IS-IS on an Interface
 
You want to temporarily turn off IS-IS on an interface.
Disable IS-IS on the interface:
 
[edit protocols isis]

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Juniper Improving IS-IS Convergence Times
 
You want to speed convergence of IS-IS routes in case a path fails with no hardware indication, which might happen on an Ethernet network.
Have IS-IS perform the SPF calculation more often:
 
[edit protocols isis]

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Juniper Redistributing OSPF Routes into IS-IS
 
You have a single, low-speed link to a small customer and instead, of having the customer run IS-IS (or even ospf), you want to set up a ospf route to the customer.
Create a routing policy to redistribute ospf routes into IS-IS:
 
[edit policy-options]

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Juniper Redistributing RIP Routes into IS-IS
 
You have a single, low-speed link to a small customer and instead, of having the customer run IS-IS (or even RIP), you want to set up a rip route to the customer.
Create a routing policy to redistribute rip routes into IS-IS:
 
[edit policy-options]

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Juniper Configuring IS-IS for IPv6
 
You want to use IS-IS on an IPv6 network.
The IS-IS configuration for an IPv6 network is the same as for IPv4. Configure the interfaces, enable ISO on the IS-IS interfaces, and configure a NET on lo0:
 
[edit protocols isis]

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Juniper Configuring a Level 1 Only Router
 
You want to set up the Level 1only routers.
For routers that participate only in a Level 1 area, disable Level 2 on the router:
 
[edit protocols isis]

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