Step 4: Take Appropriate Action

Action

Depending on the error you encountered in your investigation, you must take the appropriate action to correct the problem. In the example below, the routers are configured to function at different levels of the IS-IS protocol.

Action

To correct the error in this example, enter the following commands:

user@R6> edit

[edit]

user@R6> edit protocols isis

[edit protocols isis]

user@R6# show

user@R6# delete level 2

user@R6# set level 1 disable

user@R6# show

user@R6# commit

user@R6# run show isis adjacency

Sample Output

user@R6> edit 

Entering configuration mode

[edit]

user@R6# edit protocols isis 

[edit protocols isis]

user@R6# show 

level 2 disable;

interface all {

    level 2 metric 10;

}

interface fxp0.0 {

    disable;

}

interface lo0.0; {

    passive

[edit protocols isis]

user@R6# delete level 2 

[edit protocols isis]

user@R6# set level 1 disable 

[edit protocols isis]

user@R6# show 

level 1 disable;

interface all {

    level 2 metric 10;

}

interface fxp0.0 {

    disable;

}

interface lo0.0; {

    passive

[edit protocols isis]

user@R6# commit 

commit complete

[edit protocols isis]

user@R6# run show isis adjacency 

Interface             System         L State        Hold (secs) SNPA

so-0/0/0.0            R5             2 Up                   22

so-0/0/1.0            R4             2 Up                   22

so-0/0/2.0            R2             2 Up                   22

so-0/0/3.0            R3             2 Up                   22

What It Means

The sample output shows that the configuration error on egress router R6 has been corrected and IS-IS adjacencies are now established.