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traffic to pass through one path while other traffic can follow a different one. Dividing

traffic in this way supports traffic load-balancing in the ring.

This example describes how to use ERP with ring instances to load-balance traffic while

still providing network protection from link failure:

•

Requirements on page 161

•

Overview and Topology on page 161

•

Configuration on page 164

•

Verification on page 172

Requirements

This example uses the following hardware and software components:

•

Two MX Series routers acting as core switches

•

One MX Series router acting as an aggregation switch

•

Junos OS Release 10.2 or later for MX Series routers

Overview and Topology

Figure 24 on page 162 displays the topology for this example. The topology contains three

MX Series routers. CS1 and CS2 act as core routers in the topology, and AS1 acts as an

aggregation switch. Each router has two ring instances, ring-1 and ring-2. All nodes on

the ring coordinate protection activities by exchanging messages through the Ethernet

ring automatic protection switching (R-APS) messaging protocol. Each ring instance has

an RPL owner. The ring-1 RPL owner is CS1; the ring-2 RPL owner is CS2. The RPL owners

block or unblock the RPL as conditions require and initiate R-APS messages.

Each ring instance has two interface ports (an east interface and a west interface) that

participate in the instance. Interface ge-2/0/8.0, the west interface on CS2, is the ring

protection link end where ring-2’s RPL terminates. Interface ge-3/2/4.0, the east interface

on CS1, is the ring protection link end where ring-1’s RPL terminates.

Each ring instance has a data channel. A data channel is a group of bridge domain virtual

LAN (VLAN) IDs. All VLAN IDs within the same ring interface share the same

data-forwarding properties controlled by the ERP. The data channel on ring-1 is [200,

300]. The data channel on ring-2 is [500, 600].

Two customer site switches are connected to AS1. Customer site 1 uses VLANs 200 and

300. Customer site 2 uses VLANs 500 and 600.

Chapter 13: Ethernet Ring Protection

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Juniper-networks JUNOS OS 10.4 Bedienungsanleitung Seite 181