Cisco Catalyst 6880-X Specifications download pdf (Page 36)

Access Layer April 2014

Procedure 5 Connect to distribution or WAN router

Access layer devices can be one component of a larger LAN and connect to a distribution switch, or, in the case

of a small remote site, might be the only LAN device and connect directly to a WAN device. Unless the access

layer device is a single fixed configuration switch connecting to a WAN router, Layer 2 EtherChannels are used to

interconnect the devices in the most resilient method possible.

When using EtherChannel, the member interfaces should be on different switches in the stack or different

modules in the modular switch for the highest resiliency.

The physical interfaces that are members of a Layer 2 EtherChannel are configured prior to configuring the

logical port-channel interface. This allows for minimal configuration because most of the commands entered to a

port-channel interface are copied to its members’ interfaces and do not require manual replication.

Figure 12 - EtherChannel example

2096

Distribution

Switch

Logical

PortChannel

Interface

Switch Stack

Member

Interface

Member

Interface

Configure two or more physical interfaces to be members of the EtherChannel. It is recommended that they are

added in multiples of two.

This procedure details how to connect any access layer switch (Cisco Catalyst 4500, 3850, 3650, 3750-

X, 3560-X, 2960-X, or 2960-S) or to a distribution switch or WAN router. Where there are differences for

configuring a specific switch, the differences are called out in the step. If the upstream device is not a distribution

switch (such as a remote site connection to a router) use Option 2 with an interface type that is appropriate for

the deployment.

Option 1: Congure EtherChannel to distribution switch

Step 1: Configure EtherChannel member interfaces.

This design uses Layer 2 EtherChannels to connect all access layer switches to the distribution layer. When

connecting to another switch, use two links or a multiple of two links distributed for maximum resiliency. A

configuration with four links is shown in the example. Set Link Aggregation Control Protocol negotiation to active

on both sides to ensure a proper EtherChannel is formed. Also, apply the egress QoS macro that was defined in

the platform configuration procedure in order to ensure traffic is prioritized appropriately.

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Cisco Catalyst 6880-X Specifications Page 36