Cisco 10000-2P2-2DC Software Guide - Page 538
Configuring VLAN-Based Load Balancing, Restrictions for VLAN-Based Load Balancing
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Configuring VLAN-Based Load Balancing Chapter 23 Configuring Gigabit EtherChannel Features For more information on how to aggregate multiple Ethernet links into one logical channel, see IEEE 802.3ad Link Bundling feature guide at: http://www.cisco.com/univercd/cc/td/doc/product/software/ios122sb/newft/122sb31/sbcelacp.htm#wp1 053782 Configuring VLAN-Based Load Balancing In Cisco IOS Release 12.2(33)XNE, there is support for VLAN-based load balancing for the GEC interface on the Cisco 10000 series routers. The user can enable manual VLAN load balancing and select the member-links on which a particular VLAN traffic is to be forwarded. The VLAN load balancing feature can map a VLAN sub-interface to a member-link called a primary member-link. The egress traffic for the VLAN sub-interface is then transmitted through that primary member-link. The feature also allows the user to specify a standby member-link called a secondary member-link for a VLAN sub-interface. The secondary member-link is used if the primary member-link goes down. Table 23-2 shows the active and standby links for different primary and secondary states. Table 23-2 Active and standby links for different primary and secondary states Primary Up Up Down Down Secondary Up Down Up Down Active Primary Primary Secondary Primary Standby Secondary Secondary Primary Secondary All packets forwarded over a VLAN sub-interface are considered to be part of the same flow that is mapped to one bucket. Each bucket is associated with both primary and secondary member-links. The bucket points to the active interface in the pair, either primary or secondary. Multiple VLAN flows can be mapped to the same bucket if their primary and secondary member-links mapping is the same. Restrictions for VLAN-Based Load Balancing • Only static mapping of VLAN sub-interfaces is supported; internal, dynamic load balancing is not supported. • The primary member-link must be configured. • When service policy is applied to port channel's main or subinterface, changing the load balancing mode from VLAN to flow is not supported. • On a GEC bundle, executing the VLAN-based load balancing feature, along with the VLAN group QoS feature, requires that all VLAN sub-interfaces in a particular VLAN group have the same primary and secondary member-links configured. • When a hierarchical queuing policy is applied on a port channel VLAN sub-interface, the hierarchical queues related to the policymap are created on both primary and secondary member-links associated with the VLAN sub-interface. Egress traffic for this VLAN sub-interface is enqueued on to the corresponding queues, at the primary member-link. In an event of the primary member-link going down, the traffic for the VLAN sub-interface is redirected to the queues on the secondary member-link. 23-12 Cisco 10000 Series Router Software Configuration Guide OL-2226-23
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