Table of Contents
Advertisement
Configuring Multi-chassis Link Aggregation
MC-LAG Overview
Multi Chassis Link Aggregation (MC-LAG) addresses resiliency at the edge of the network by enabling
dual homing of any standards-based edge switches to a pair of aggregation switches resulting in a Layer 2
multi-path infrastructure. MC-LAG provides increased bandwidth, load balancing and resiliency for L2
edge devices in a network.
An edge switch is dual homed to two Omniswitch10K through Link Aggregation Control Protocol or
Static Aggregation. MC-LAG enhances link aggregation by eliminating blocked redundant links to
provide fast switch over between edge and core switches without implementing Spanning Tree. Dual
homed uplinks are active /active and provide sub second traffic convergence for link fail.
Edge
MC-LAG: Multi-Chassis
Link Aggregate
MC-LAG Concepts and Components
MC-LAG is an OmniSwitch 10K feature that requires complex building blocks to provide full functional-
ity. The following sections highlight various aspects of MC-LAG.
The Multi chassis domain is a virtual entity consisting of a peer OmniSwitch 10K, the virtual fabric link,
all of the MC-LAG aggregate ports and the edge devices attached to MC-LAGs. A Multi-Chassis domain
can support up to 128 MC-LAG groups.
Multi-Chassis Manager (MCM) is an Alcatel Lucent proprietary application that manages and monitors
the multichassis functionality. MCM provides the foundation for inter-chassis communication
infrastructure that can be used by applications (e.g. link aggregation) to exchange state information.
•
MCM Manages and monitors multi-chassis functionality, performs peer discovery and establishes the
VFL.
•
MCM performs and monitors consistency parameters between peer chassis and runs the hello protocol
between peer chassis.
OmniSwitch AOS Release 7 Network Configuration Guide
MC-LAG-1
All links are active
All links are active
MC-LAG-2
Multi-Chassis Infra-
structure that allows
applications to exchange
state information over the
virtual fabric link
Example of a MC-LAG Group Network
Aggregation
Virtual Fabric
March 2011
MC-LAG Overview
Multi-Chassis
Peer Switch
Link
Multi-Chassis
Domain
Multi-Chassis
Peer Switch
page 8-9
Advertisement
Table of Contents
