anRPL owner. The ring-1 RPL owneris CS1; the ring-2 RPL owner is CS2. The RPL owners
blockor unblock the RPL as conditions require and initiateR-APS messages.
Eachring instance has two interfaceports (an east interface and a west interface)that
participatein the instance. Interface ge-2/0/8.0,the west interface on CS2, is the ring
protectionlinkend where ring-2’s RPL terminates. Interfacege-3/2/4.0,the east interface
onCS1, is the ring protection link end where ring-1’s RPL terminates.
Eachring instance has a datachannel. 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-forwardingproperties controlledby the ERP. The data channel on ring-1 is [200,
300].The data channel on ring-2 is [500, 600].
Twocustomer site switchesare connected to AS1. Customer site 1 uses VLANs 200 and
300.Customer site 2 uses VLANs 500 and 600.
Figure24: ERP with Multiple Protection Instances Configuredon ThreeMXSeries Routers
AS1
CS1 CS2
g017469
ge-5/2/3.0
west-interface
ge-2/0/4.0
east-interface
ring-1
data-channel[200,300]
ring-2
data-channel[500,600]
RPLowner
ring-1
ge-3/2/4.0
east-interface
RPlink end ring-1
ge-2/0/8.0
west-interface
RPlink end ring-2
ge-2/0/5.0
west-interface
ge-2/1/1.0
east-interface
RPLowner
ring-2
CustomerSite 2
VLANs[500,600]
CustomerSite 1
VLANs[200,300]
Table5 on page156 describes the components of the example topology.
155Copyright© 2010, Juniper Networks,Inc.
Chapter13: Ethernet Ring Protection