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Example: Limiting the Number of ATM Virtual Circuits

Requirements

This example uses a device running Junos OS with an ATM interface.

Overview and Commit Script

For each ATM interface, the set of corresponding VCs is selected. The number of those VCs, as determined by the built-in Extensible Stylesheet Language Transformations (XSLT) count() function, cannot exceed the limit set by the global variable limit. If there are more ATM VCs than limit, a commit error is generated, and the commit operation fails.

The example script is shown in both XSLT and SLAX 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:param name="limit" select="10"/>
    <xsl:template match="configuration">
        <xsl:for-each select="interfaces/interface[starts-with(name, 'at-')]">
            <xsl:variable name="count" select="count(unit)"/>
            <xsl:if test="$count &gt; $limit">
                <xnm:error>
                    <edit-path>[edit interfaces]</edit-path>
                    <statement><xsl:value-of select="name"/></statement>
                    <message>
                        <xsl:text>ATM VC limit exceeded; </xsl:text>
                        <xsl:value-of select="$count"/>
                        <xsl:text> are configured but only </xsl:text>
                        <xsl:value-of select="$limit"/>
                        <xsl:text> are allowed.</xsl:text>
                    </message>
                </xnm:error>
            </xsl:if>
        </xsl:for-each>
    </xsl:template>
</xsl:stylesheet>

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";
 
param $limit = 10;
match configuration {
    for-each (interfaces/interface[starts-with(name, 'at-')]) {
        var $count = count(unit);
        if ($count > $limit) {
            <xnm:error> {
                <edit-path> "[edit interfaces]";
                <statement> name;
                <message> {
                    expr "ATM VC limit exceeded; ";
                    expr $count;
                    expr " are configured but only ";
                    expr $limit;
                    expr " are allowed.";
                }
            }
        }
    }
}

Configuration

Step-by-Step Procedure

1. Copy the XSLT or SLAX script into a text file, name the file atm-vc-limit.xsl or atm-vc-limit.slax as appropriate, and copy it to the /var/db/scripts/commit/ directory on the device.

2. 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 atm-vc-limit.slax.

   system {scripts {commit {file atm-vc-limit.xsl;}}}

   interfaces {at-1/2/3 {unit 15 {family inet {address 10.12.13.15/20;}}unit 16 {family inet {address 10.12.13.16/20;}}unit 17 {family inet {address 10.12.13.17/20;}}unit 18 {family inet {address 10.12.13.18/20;}}unit 19 {family inet {address 10.12.13.19/20;}}unit 20 {family inet {address 10.12.13.20/20;}}unit 21 {family inet {address 10.12.13.21/20;}}unit 22 {family inet {address 10.12.13.22/20;}}unit 23 {family inet {address 10.12.13.23/20;}}unit 24 {family inet {address 10.12.13.24/20;}}unit 25 {family inet {address 10.12.13.25/20;}}unit 26 {family inet {address 10.12.13.26/20;}}}}

3. In configuration mode, issue the load merge terminal command 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 ...
   1. At the prompt, paste the contents of the clipboard by using the mouse and the paste icon.
   2. Press Enter.
   3. Press Ctrl+d.

4. Issue the commit command to commit the configuration.

   user@host# commit

Verification

Verifying the Commit Script Output

Purpose

Verify that the script behaves as expected.

Action

[edit]
user@host# commit
[edit interfaces]
    'at-1/2/3'
    ATM VC limit exceeded; 12 are configured but only 10 are allowed.
error: 1 error reported by commit scripts
error: commit script failure