L2 and L3 Deployments

The early chapters of the second edition of this book focus on some of the newer Juniper Networks device features and capabilities found in the new enterprise network that blur the distinction between routing and switching. And this section continues that focus by defining the features that are not covered in the remainder of this book, which concentrates on enterprise routing and the routing capabilities you will find in your MX, EX, and SRX devices.

Here, before we launch into an in-depth look at enterprise routing, we take a quick look at the blurred features. Where the following features are better defined in another work, we reference that work rather than repeat the content here.

Link Aggregation Groups

Link aggregation groups (LAGs) are a means to increase bandwidth and redundancy between devices in the enterprise. These devices can be switches, routers, or servers. The LAG implementation in Junos follows the 802.3ad standard and can support up to eight interfaces. When LAGs are added to a virtual chassis operation, the links can be supported from different devices in the virtual chassis, increasing redundancy.

Figure 3-6 depicts a LAG configuration example where two interfaces, ge-0/0/0 and ge-0/0/1, are part of a LAG called ae0. A LAG requires three separate settings: the chassis has to have the device count defined, the aggregate Ethernet (ae) interface must be defined, and the Ethernet interfaces must be associated with the ae0 interface. If the link ...

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