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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]
source@RouterA# set interface ge-1/0/1 disable
 
To start IS-IS again, remove the disable statement from the configuration:
 
[edit protocols isis]
source@RouterA# delete disable
source@RouterA# commit
 
To remove an interface from the IS-IS network, you can disable it. Because you are only removing the interface temporarily, you don't want to remove the configuration statements entirely. You see that the interface is down:
 
source@RouterA> show isis interface
 
IS-IS interface database:
Interface             L CirID Level 1 DR    Level 2 DR    L1/L2 Metric
ge-0/0/1.0            3   0x2 RouterA.02    RouterA.02         10/10
ge-1/0/0.0            1   0x3 RouterA.02    Disabled           10/10
ge-1/0/1.0            3   0x1 Disabled      Disabled           10/10
lo0.0                 0   0x1 Passive       Passive             0/0
 
Also, the adjacency to the neighbor is down:
 
source@RouterA> show isis adjacency
Interface             System        L State    Hold (secs) SNPA
ge-0/0/1.0            RouterC       2 Up               26  0:5:85:c1:d1:d1
ge-1/0/0.0            RouterA       1 Up                6  0:5:85:ca:ca:70
ge-1/0/1.0            RouterJ       2 Down              0  0:5:85:c4:72:f5
 
Another way to disable IS-IS on an interface is with the deactivate command:
 
[edit protocols isis]
source@RouterA# deactivate interface ge-1/0/1.0
source@RouterA# commit
source@RouterA# show
interface ge-0/0/1.0;
interface ge-1/0/0.0 {
    level 2 disable;
}
inactive: interface ge-1/0/1.0;
interface lo0.0;
}
 
To start IS-IS again on the interface, reactivate it:
 
[edit protocols isis]
source@RouterA# > activate interface ge-1/0/1
source@RouterA# commit
 
You can also temporarily disable OSPF on the router:
 
[edit protocols isis]
source@RouterA# set disable
source@RouterA# commit and-quit
source@RouterA> show isis interface
 
IS-IS instance is not running
 
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