Configuring Vlan Load Balancing On Flex Links - Cisco WS-CBS3032-DEL Software Configuration Manual

Chapter 21 Configuring Flex Links and the MAC Address-Table Move Update Feature

Configuring VLAN Load Balancing on Flex Links

Beginning in privileged EXEC mode, follow these steps to configure VLAN load balancing on Flex
Links:
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3 switchport backup interface interface-id prefer vlan
vlan-range
Step 4
end
Step 5 show interfaces [interface-id] switchport backup
Step 6 copy running-config startup config
To disable the VLAN load balancing feature, use the no switchport backup interface interface-id
prefer vlan vlan-range interface configuration command.
In the following example, VLANs 1 to 50, 60, and 100 to 120 are configured on the switch:
Switch(config)#interface gigabitethernet 2/0/6
Switch(config-if)#switchport backup interface gigabitethernet 2/0/8 prefer vlan 60,100-120
When both interfaces are up, Gi2/0/8 forwards traffic for VLANs 60 and 100 to 120 and Gi2/0/6
forwards traffic for VLANs 1 to 50.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------
GigabitEthernet2/0/6
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
When a Flex Link interface goes down (LINK_DOWN), VLANs preferred on this interface are moved
to the peer interface of the Flex Link pair. In this example, if interface Gi2/0/6 goes down, Gi2/0/8 carries
all VLANs of the Flex Link pair.
Switch# show interfaces switchport backup
Switch Backup Interface Pairs:
Active Interface
------------------------------------------------------------------------
GigabitEthernet2/0/6
Vlans Preferred on Active Interface: 1-50
Vlans Preferred on Backup Interface: 60, 100-120
OL-13270-06
Configuring Flex Links and MAC Address-Table Move Update
Purpose
Enter global configuration mode.
Specify the interface, and enter interface configuration
mode. The interface can be a physical Layer 2 interface or
a port channel (logical interface). The port-channel range
is 1 to 64.
Configure a physical Layer 2 interface (or port channel)
as part of a Flex Links pair with the interface and specify
the VLANs carried on the interface. The VLAN ID range
is 1 to 4094.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the switch startup
configuration file.
Backup Interface
GigabitEthernet2/0/8
Backup Interface
GigabitEthernet2/0/8
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
State
Active Up/Backup Standby
State
Active Down/Backup Up
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