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Related Topics ■ Local Cross-Connects on page 520

■ For more information about policies and MPLS layer 2 circuits, see Managing

Policies on the E Series Router, Creating or Modifying Classifier Control Lists for

MPLS Policy Lists, and Creating Policy Lists for MPLS in the JUNOSe Policy

Management Configuration Guide

■ interface pos

■ interface serial

■ mpls policy

■ mpls-relay

■ route interface

Configuring CE-Side Load Balancing for Martini Layer 2 Transport

For layer 2 circuits over an MPLS core, each circuit normally has a single shim

interface on the local router. In the case of a local cross-connects configuration, each

end of the cross-connect has a single shim interface, creating a two-way cross-connect.

Alternatively, a given layer 2 circuit or each end of a local cross-connect can have

many shim interfaces. In these cases, traffic destined for the CE routers is

load-balanced among the multiple shim interfaces. This is known as CE-side load

balancing. In the case of Ethernet/VLANs, CE-side load balancing enables an E Series

router to interoperate with an 802.3ad switch.

You can configure load balancing in two different ways. You can configure many

shim interfaces with the same peer, VC type, and VC ID. Alternatively, you can use

the legacy method of configuring Martini circuits into load-balancing groups.

Configuring Many Shim Interfaces with the Same Peer, VC Type, and VC ID

The mpls-relay command enables you to specify the peer and the VC ID explicitly.

The VC type is either automatically determined by the layer 2 interface type or you

explicitly configure the VC type with the relay-format keyword in the mpls-relay

command.

For example, the following commands create a single layer 2 circuit to the remote

peer 10.9.1.3. Load balancing is established on two shim interfaces, fastEthernet

2/0.1 and fastEthernet 3/0.1. The VC type is determined by the layer 2 interface type.

host1(config)#interface fast 2/0.1

host1(config-subif)#vlan id 1

host1(config-subif)#mpls-relay 10.9.1.3 200001

host1(config-subif)#exit

host1(config)#interface fast 3/0.1

host1(config-subif)#vlan id 1

host1(config-subif)#mpls-relay 10.9.1.3 200001

540 ■ Configuring CE-Side Load Balancing for Martini Layer 2 Transport

JUNOSe 11.1.x BGP and MPLS Configuration Guide

Juniper BGP - CONFIGURATION GUIDE V 11.1.X User Manual

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