Example: Configuring Ethernet Ring Protection for MX Series Routers

Example Topology

The links connecting the three MX Series routers are shown in Figure 1.

Figure 1: Ethernet Ring Protection Example Nodes

• Router 1 is the RPL owner. The node identification for Router 1 is MAC address 00:01:01:00:00:01.
• The RPL link is ge-1/0/1.1 (this is also the R-APS messaging control channel).
• Traffic flows among the nodes in the configured bridge domains. (That is, only the control channels are configured.)
• Router 1’s east control channel interface is ge-1/0/1.1 (the RPL) and the west control channel interface is ge-1/2/4.1. The protection group is pg101.
• Router 2’s east control channel interface is ge-1/0/2.1 (the RPL) and the west control channel interface is ge-1/2/1.1. The protection group is pg102.
• Router 3’s east control channel interface is ge-1/0/3.1 (the RPL) and the west control channel interface is ge-1/0/4.1. The protection group is pg103.

Note: Although not strictly required for physical ring protection, this example configures Ethernet OAM with MEPs.

Router 1 (RPL Owner) Configuration

1. Configure the interfaces:
   [edit]interfaces {ge-1/0/1 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}ge-1/2/4 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}}
2. Configure the bridge domain:
   [edit]bridge-domains {bd1 {domain-type bridge;interface ge-1/2/4.1;interface ge-1/0/1.1;}}
3. Configure the Ethernet ring protection group:
   [edit]protocols {protection-group {ethernet-ring pg101 {node-id 00:01:01:00:00:01;ring-protection-link-owner;east-interface {control-channel ge-1/0/1.1;ring-protection-link-end;}west-interface {control-channel ge-1/2/4.1;}}}}
4. Configure Ethernet OAM:
   [edit]protocols {oam {ethernet {connectivity-fault-management {action-profile rmep-defaults {default-action {interface-down;}}maintenance-domain d1 {level 0;maintenance-association 100 {mep 1 {interface ge-1/0/1;remote-mep 2 {action-profile rmep-defaults;}}}}maintenance-domain d2 {level 0;maintenance-association 100 {mep 1 {interface ge-1/2/4;remote-mep 2 {action-profile rmep-defaults;}}}}}}}}

Router 2 Configuration

1. Configure the interfaces:
   [edit]interfaces {ge-1/0/2 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}ge-1/2/1 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}}
2. Configure the bridge domain:
   [edit]bridge-domains {bd1 {domain-type bridge;interface ge-1/2/1.1;interface ge-1/0/2.1;}}
3. Configure the Ethernet protection group:
   [edit]protocols {protection-group {ethernet-ring pg102 {east-interface {control-channel ge-1/0/2.1;}west-interface {control-channel ge-1/2/1.1;}}}}
4. Configure Ethernet OAM:
   [edit]protocols {oam {ethernet {connectivity-fault-management {action-profile rmep-defaults {default-action {interface-down;}}maintenance-domain d1 {level 0;maintenance-association 100 {mep 2 {interface ge-1/2/1;remote-mep 1 {action-profile rmep-defaults;}}}}maintenance-domain d3 {level 0;maintenance-association 100 {mep 1 {interface ge-1/0/2;remote-mep 2 {action-profile rmep-defaults;}}}}}}}}

Router 3 Configuration

1. Configure the interfaces:
   [edit]interfaces {ge-1/0/4 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}ge-1/0/3 {vlan-tagging;encapsulation flexible-ethernet-services;unit 1 {encapsulation vlan-bridge;vlan-id 100;}}}
2. Configure the bridge domain:
   [edit]bridge-domains {bd1 {domain-type bridge;interface ge-1/0/4.1;interface ge-1/0/3.1;}}
3. Configure the Ethernet protection group:
   [edit]protocols {protection-group {ethernet-ring pg103 {east-interface {control-channel ge-1/0/3.1;}west-interface {control-channel ge-1/0/4.1;}}}}
4. Configure Ethernet OAM:
   [edit]protocols {oam {ethernet {connectivity-fault-management {action-profile rmep-defaults {default-action {interface-down;}}maintenance-domain d2 {level 0;maintenance-association 100 {mep 2 {interface ge-1/0/4;remote-mep 1 {action-profile rmep-defaults;}}}}maintenance-domain d3 {level 0;maintenance-association 100 {mep 2 {interface ge-1/0/3;remote-mep 1 {action-profile rmep-defaults;}}}}}}}}