Name: Cisco 2100 Series
Brand: Cisco
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3-31

Cisco Wireless LAN Controller Configuration Guide

OL-17037-01

Chapter 3 Configuring Ports and Interfaces

Enabling Link Aggregation

• The Catalyst 6500 series switches running in PFC3 or PFC3CXL mode implement enhanced

EtherChannel load balancing. The enhanced EtherChannel load balancing adds the VLAN number

to the hash function, which is incompatible with LAG. From the 12.2(33)SXH and later releases,

Catalyst 6500 IOS software offers the exclude vlan keyword to the port-channel load-balance

command to implement src-dst-ip load distribution. See the Cisco IOS Interface and Hardware

Component Command Reference guide for more information.

• Enter the show platform hardware pfc mode command on the Catalyst 6500 switch to confirm the

PFC operating mode.

The following example shows a Catalyst 6500 series switch in PFC3B mode when you enter the

global configuration port-channel load-balance src-dst-ip command for proper LAG

functionality:

# show platform hardware pfc mode PFC operating mode

PFC operating mode : PFC3B

# show EtherChannel load-balance

EtherChannel Load-Balancing Configuration:

src-dst-ip

The following example shows Catalyst 6500 series switch in PFC3C mode when you enter the

exclude vlan keyword in the port-channel load- balance src-dst-ip exclude vlan command.

# show platform hardware pfc mode

PFC operating mode : PFC3C

# show EtherChannel load-balance

EtherChannel Load-Balancing Configuration:

src-ip enhanced

# mpls label-ip

• If the recommended load-balancing method cannot be configured on the Catalyst switch, then

configure the LAG connection as a single member link or disable LAG on the controller.

Figure 3-12 Link Aggregation with Catalyst 6500 Neighbor Switch

Cisco 2100 Series Configuration Guide

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