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Controlling IS-IS and MPLS Interfaces

If you want to enable Multiprotocol Label Switching (MPLS) on an interface, you must make changes at both the [edit interfaces] and [edit protocols mpls] hierarchy levels. This example shows you how to use commit scripts to decrease the amount of manual configuration.

This example performs two related tasks. If an interface has [family iso] configured but not [family mpls], a configuration change is made (using the <jcs:emit-change> template) to enable MPLS. MPLS is not valid on loopback interfaces (loX), so this script ignores loopback interfaces. Secondly, if the interface is not configured at the [edit protocols mpls] hierarchy level, a change is made to add the interface. Both changes are accompanied by appropriate warning messages.

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:variable name="mpls" select="protocols/mpls"/>
        <xsl:for-each select="interfaces/interface[not(starts-with(name,'lo'))]
                                        /unit[family/iso]">
            <xsl:variable name="ifname" select="concat(../name, '.', name)"/>
            <xsl:if test="not(family/mpls)">
                <xsl:call-template name="jcs:emit-change">
                    <xsl:with-param name="message">
                        <xsl:text>Adding 'family mpls' to ISO-enabled interface</xsl:text>
                    </xsl:with-param>
                    <xsl:with-param name="content">
                        <family>
                            <mpls/>
                        </family>
                    </xsl:with-param>
                </xsl:call-template>
            </xsl:if>
            <xsl:if test="$mpls and not($mpls/interface[name = $ifname])">
                <xsl:call-template name="jcs:emit-change">
                    <xsl:with-param name="message">
                        <xsl:text>Adding ISO-enabled interface </xsl:text>
                        <xsl:value-of select="$ifname"/>
                        <xsl:text> to [protocols mpls]</xsl:text>
                    </xsl:with-param>
                    <xsl:with-param name="dot" select="$mpls"/>
                    <xsl:with-param name="content">
                        <interface>
                            <name>
                                <xsl:value-of select="$ifname"/>
                            </name>
                        </interface>
                    </xsl:with-param>
                </xsl:call-template>
            </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 {
    var $mpls = protocols/mpls;


    for-each (interfaces/interface[not(starts-with(name, "lo"))]/unit[family/iso]) {
        var $ifname = ../name _  '.' _  name;


        if (not(family/mpls)) {
            call jcs:emit-change() {
                with $message = {
                    expr "Adding 'family mpls' to ISO-enabled interface";
                }
                with $content = {
                    <family> {
                        <mpls>;
                    }
                }
            }
        }
        if ($mpls and not($mpls/interface[name = $ifname])) {
            call jcs:emit-change($dot = $mpls) {
                with $message = {
                    expr "Adding ISO-enabled interface ";
                    expr $ifname;
                    expr " to [protocols mpls]";
                }
                with $content = {
                    <interface> {
                        <name> $ifname;
                    }
                }
            }
        }
    }
}

Testing ex-iso.xsl

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

From Controlling IS-IS and MPLS Interfaces, copy the Extensible Stylesheet Language Transformations (XSLT) or SLAX script into a text file, and name the file ex-iso.xsl. Copy the ex-iso.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-iso.xsl;
        }
    }
}
interfaces {
    lo0 {
        unit 0 {
            family iso;
        }
    }
    so-1/2/3 {
        unit 0 {
            family iso;
        }
    }
    so-1/3/2 {
        unit 0 {
            family iso;
        }
    }
}
protocols {
    mpls {
        enable;
    }
}

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 interface so-1/2/3 unit 0]
    warning: Adding 'family mpls' to ISO-enabled interface
[edit interfaces interface so-1/2/3 unit 0]
    warning: Adding ISO-enabled interface so-1/2/3.0 to [protocols mpls]
[edit interfaces interface so-1/3/2 unit 0]
    warning: Adding 'family mpls' to ISO-enabled interface
[edit interfaces interface so-1/3/2 unit 0]
    warning: Adding ISO-enabled interface so-1/3/2.0 to [protocols mpls]
commit complete

Issue the show interfaces command. Confirm that the loopback interface is not altered, and the SONET/SDH interfaces are altered.



[edit]
user@host# show interfaces

so-1/2/3 {
    unit 0 {
        family iso;
        family mpls;
    }
}
so-1/3/2 {
    unit 0 {
        family iso;
        family mpls;
    }
}
lo0 {
    unit 0 {
        family iso;
    }
}

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