[Contents] [Prev] [Next] [Index] [Report an Error]

Limiting the Number of ATM Virtual Circuits

This example limits the number of Asynchronous Transfer Mode (ATM) virtual circuits (VCs) configured on an ATM interface.

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.

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: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>

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";


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.";
                }
            }
        }
    }
}

Testing ex-atm-vc-limit.xsl

To test the example in this section, perform the following steps:

From Limiting the Number of ATM Virtual Circuits, copy the XSLT script into a text file, and name the file ex-atm-vc-limit.xsl. Copy the ex-atm-vc-limit.xsl file to the /var/db/scripts/commit directory on your routing platform.

Select the following configuration, and press Ctrl+c to copy it to the clipboard. If you are using the SLAX version of the script, change the filename to filename.slax.



system {
    scripts {
        commit {
            file ex-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;
            }
        }
    }
}

Merge the configuration into your routing platform configuration by issuing the load merge terminal configuration mode command:[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 using the mouse and the paste icon.
2. Press Enter.
3. Press Ctrl+d.

Issue the commit command. When you issue the commit command, the following output appears:



[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

[Contents] [Prev] [Next] [Index] [Report an Error]