Example: Require Internal Clocking on T1 Interfaces
This example shows how to use a commit script to require that T1 interfaces be configured with internal clocking.
Requirements
This example uses a device running Junos OS with T1 interfaces.
Overview and Commit Script
This commit script ensures that T1 interfaces are explicitly
configured to use internal clocking. If the clocking statement
is not included in the configuration, or if the clocking external statement is included, an error message is generated, and the configuration
is not committed.
The example script is shown in both XSLT and SLAX syntax:
XSLT Syntax
<?xml version="1.0" standalone="yes"?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:junos="http://xml.juniper.net/junos/*/junos" xmlns:xnm="http://xml.juniper.net/xnm/1.1/xnm" xmlns:jcs="http://xml.juniper.net/junos/commit-scripts/1.0"> <xsl:import href="../import/junos.xsl"/> <xsl:template match="configuration"> <xsl:for-each select="interfaces/interface[starts-with(name, 't1-')]"> <xsl:variable name="clock-source"> <xsl:value-of select="clocking"/> </xsl:variable> <xsl:if test="not($clock-source = 'internal')"> <!-- or xsl:if test="$clock-source != 'internal'" --> <xnm:error> <xsl:call-template name="jcs:edit-path"/> <xsl:call-template name="jcs:statement"> <xsl:with-param name="dot" select="clocking"/> </xsl:call-template> <message> This T1 interface should have internal clocking. </message> </xnm:error> </xsl:if> </xsl:for-each> </xsl:template> </xsl:stylesheet>
SLAX Syntax
version 1.0;
ns junos = "http://xml.juniper.net/junos/*/junos";
ns xnm = "http://xml.juniper.net/xnm/1.1/xnm";
ns jcs = "http://xml.juniper.net/junos/commit-scripts/1.0";
import "../import/junos.xsl";
match configuration {
for-each (interfaces/interface[starts-with(name, 't1-')]) {
var $clock-source = {
expr clocking;
}
if (not($clock-source = 'internal')) {
<xnm:error> {
call jcs:edit-path();
call jcs:statement($dot = clocking);
<message> "This T1 interface should have internal clocking.";
}
}
}
}Configuration
Procedure
Step-by-Step Procedure
To download, enable, and test the script:
Copy the script into a text file, name the file clocking-error.xsl or clocking-error.slax as appropriate, and copy it to the /var/db/scripts/commit/ directory on the device.
Select the following test configuration stanzas, and press Ctrl+c to copy them to the clipboard.
If you are using the SLAX version of the script, change the filename at the
[edit system scripts commit file]hierarchy level to clocking-error.slax.system { scripts { commit { file clocking-error.xsl; } } } interfaces { t1-0/0/0 { clocking external; } t1-0/0/1 { unit 0; } }In configuration mode, issue the
load merge terminalcommand to merge the stanzas into your device configuration.[edit] user@host# load merge terminal [Type ^D at a new line to end input] ... Paste the contents of the clipboard here ...
At the prompt, paste the contents of the clipboard by using the mouse and the paste icon.
Press Enter.
Press Ctrl+d.
Commit the configuration.
user@host# commit
Verification
Verifying Commit Script Execution
Purpose
Verify that the script behaves as expected.
Action
Review the output of the commit command. The
sample configuration stanzas configure two T1 interfaces t1-0/0/0
and t1-0/0/1. Interface t1-0/0/0 is configured with the clocking
external statement, and interface t1-0/0/1 does not include
any clocking statement. The script generates an error,
and the commit operation fails. The following output appears after
issuing a commit command:
[edit] user@host# commit [edit interfaces interface t1-0/0/0] 'clocking external;' This T1 interface should have internal clocking. [edit interfaces interface t1-0/0/1] ';' This T1 interface should have internal clocking. error: 2 errors reported by commit scripts error: commit script failure