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Figure 11. Multiple Cisco Virtual Sw itching System Domains

Another example of multiple Cisco Virtual Switching System domains is in the area of Layer 2 adjacent WAN

deployments. It may be a requirement for the business or the applications that a routed Layer 3 WAN connection may

not be possible requiring a Layer 2 connection between two disparate geographic sites, yet still providing link

redundancy at the same time. This will ultimately require some form of Layer 2 redundancy protocol be implemented

(such as Spanning Tree Protocol), resulting in complex topologies as well as inefficient bandwidth utilization across

network links. By using Cisco Virtual Switching System, such inefficiencies will be mitigated through the formation of

multichassis Cisco EtherChannel connections.

Cisco EtherChannel Concepts

Cisco EtherChannel interfaces on the Cisco Catalyst 6500 platform represent a grouping of one or more physical

ports into a single, logical port from the perspective of either a Layer 2 switching or Layer 3 routing environment.

Cisco EtherChannel interfaces allow for individual link resiliency as well as providing added bandwidth without the

necessity of complex protocols.

There are generally no restrictions with regard to which ports or modules can form members of a Cisco EtherChannel

link, except that the member interfaces need to be of the same speed and no more than 8 members can belong to a

single Cisco EtherChannel grouping. You can, therefore, extend members of the Cisco EtherChannel interface

across switching modules to allow for the maximum availability of the Cisco EtherChannel interface if either a single

link or module fails.

Traffic Distribution and Hashing

The distribution of traffic across the various members of the Cisco EtherChannel link is accomplished through

different hash schemes, each using a fixed set of fields within the frame to determine which Cisco EtherChannel

member is used to forward a particular traffic flow. With the PFC3C running Cisco IOS Software Release

12.2(33)SXH, you can choose from 13 possible different hash schemes:

vss(config)#port-channel load-balance ?

dst-ip Dst IP Addr

dst-mac Dst Mac Addr

dst-mixed-ip-port Dst IP Addr and TCP/UDP Port

dst-port Dst TCP/UDP Port

mpls Load Balancing for MPLS packets

src-dst-ip Src XOR Dst IP Addr

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