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Adding a Default Encapsulation Type

Point-to-Point Protocol (PPP) encapsulation is the default encapsulation type for physical interfaces. You need not configure encapsulation for any physical interfaces that support PPP encapsulation. If you do not configure encapsulation, PPP is used by default. For physical interfaces that do not support PPP encapsulation, you must configure an encapsulation to use for packets transmitted on the interface.

This example configures default Cisco HDLC encapsulation on SONET/SDH interfaces not configured as aggregate interfaces. The $tag variable is passed to the <jcs:emit-change> template as transient-change, so this change is not copied to the candidate configuration.

Regular configuration groups cannot test whether the configuration for an interface at the [edit interfaces interface-name sonet-options] hierarchy level includes the aggregate statement. A commit script can perform this test and set the encapsulation only on nonaggregated interfaces.

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, 'so-')
                            and not(sonet-options/aggregate)]">
            <xsl:call-template name="jcs:emit-change">
                <xsl:with-param name="tag" select="'transient-change'"/>
                <xsl:with-param name="content">
                    <encapsulation>cisco-hdlc</encapsulation>
                </xsl:with-param>
            </xsl:call-template>
        </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, 'so-') and                      not(sonet-options/aggregate)]) {
        call jcs:emit-change($tag = 'transient-change') {
            with $content = {
                <encapsulation> "cisco-hdlc";
            }
        }
    }
}

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