Discussion

Solution
Define the common information in a configuration group:
[edit]
aviva@router1# edit groups global
[edit groups global]
aviva@router1# set system domain-name mynetwork.com
aviva@router1# set system backup-router 192.168.15.2
aviva@router1# set system name-server 192.168.15.3
aviva@router1# set system root-authentication encrypted-password $123poppI
aviva@router1# set system ntp server 192.168.2.100
aviva@router1# set system services ssh
aviva@router1# set snmp location "JUNOS cookbook lab"
aviva@router1# set snmp contact cookbook-lab-admin
aviva@router1# set snmp interface fxp0.0
aviva@router1# set snmp community public authorization read-only
Then apply the group to the configuration:
[edit]
aviva@router1# set apply-groups global
Discussion
JUNOS configuration groups define common configuration snippets in one part of
the router configuration, which you then import, or apply, in other parts of the configuration.
This allows you to define common portions of the configuration once and
have them apply in many places in the configuration, thus minimizing or eliminating
the risk of configuration inconsistencies or errors. If you are a network designer who
develops router configurations that are then distributed to a number of routers in a
point of presence (POP) or NOC, configuration groups are a good tool for propagating
common configuration snippets across a number of routers. Having this information
in a separate part of the configuration also lessens the possibility that others
might inadvertently modify it. Use configuration groups for network-wide information,
such as the domain name, addresses of name and authentication servers, router
login accounts, and static routes (as we have done in this recipe) and to make it easier
to configure items that have multiple instances, such as all channels on channelized
interfaces.
Create the configuration groups under the [edit groups] hierarchy. The structure
of the statements in the configuration group mirrors that of the complete JUNOS
configuration.
In this recipe, we create one configuration group named global that defines the basic
router information discussed in Recipe 1.1, along with pointers to our SNMP NMS
system. You can create any number of group configurations, each with a distinct
name.
62 | Chapter 1: Router Configuration and File Management
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