23-13
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 23 Configuring Gigabit EtherChannel Features
Configuring VLAN-Based Load Balancing
•
When LACP max-bundle is used with VLAN-based load balancing, user needs to verify whether
both primary and secondary member-links for a VLAN sub-interface are not selected as standby
links by the LACP protocol.
•
Either of the Flow-based Load-balancing feature or VLAN-based Load Balancing feature for a GEC
bundle is supported. The Flow and VLAN-based Load Balancing can co-exist on the same router, if
they are selected for different GEC bundles.
•
VLAN-based load balancing for QinQ sub-interfaces is not supported.
•
Per VLAN bandwidth allocation cannot be more than 1 Gbps.
•
Per VLAN group bandwidth allocation cannot be more than 1 Gbps.
•
BRR can work only on a per member-link basis.
•
PPPoX and IP/DHCP session are not supported.
•
QoS on member-links is not supported.
•
1:N mode is not supported, only M:N mode is supported.
•
The Link-switchover time depends on the carrier-delay configured on the member links and for
VLAN-based load balancing the switchover time is expected to be same as flow-based load
balancing.
•
Because the HQF hierarchy for a VLAN subinterface on the GEC bundle is programmed on both
primary and secondary member-links, the HQF-related resources, such as class queues, and the
logical BLTs usage, would double and therfore, reduce the scalability of the QoS.
•
If the member-link corresponding to the VLAN is not over-subscribed, there is no impact on the
traffic of other VLANs, when new VLANs are added on the functional port channel.
•
With the VLAN group QoS feature, the class queues are created on all the member links. The
scalability of QoS reduces as the class queues are allocated from the same pool.
Configuration Tasks
To configure the VLAN-based Load Balancing feature on a GEC bundle, enter the following commands:
Command
Purpose
Step 1
router(config)#
interface port-channel
number
Creates a GEC bundle.
Step 2
router(config-if)#
load-balancing vlan
Enables the VLAN-based Load Balancing
feature on the GEC bundle.
Step 3
router(config-if)#
lacp max-bundle
1–8
Assigns the maximum number of links per
bundle. The default value is 8.
Step 4
router(config-if)#
lacp min-link
1–8
Sets the minimum number of active links
required before declaring the port channel
interface down. The default value is 1.
Step 5
router(config)#
interface
interface
Selects an GigabitEthernet interface to
configure and enters config-if mode.
Step 6
router(config-if)#
channel-group
1-64
[
mode
{
active
|
passive
}]
Configures the member link so that it can be
added to the port channel interface.
Step 7
router(config)#
interface port-channel
subinterface
Creates a GEC bundle subinterface and
enters the subinterface mode.
