Ethernet interfaces
GE interfaces
Interface-based UCMP requires that multiple physical outbound interfaces that support interface-based UCMP exist and UCMP enabled on each interface. If one of these interfaces does not support UCMP, traffic is evenly distributed on all interfaces, regardless of the UCMP function enabled on other interfaces.
To enable the interface board to record bandwidth information about load balancing on each interface, you must run the shutdown and undo shutdown commands to restart the interfaces. As a result, the routing management (RM) module re-advertises routes to the interface board. When advertising routes, the FIB module on the main control board checks whether UCMP is enabled on outbound interfaces and records bandwidth information of the UCMP-enabled interfaces in the messages. The interface board calculates the distribution ratio of traffic according to the bandwidth ratio of interfaces that are used for load balancing.
The bandwidth derives from physical link information of interfaces and cannot be manually changed.
If interface-based UCMP is enabled, global UCMP cannot be enabled. Similarly, if global UCMP is enabled, interface-based UCMP cannot be enabled.
The bandwidth accuracy for the interface board is Mbit/s, which supports high-speed links.
You must run the shutdown and undo shutdown commands in sequence after enabling UCMP on an interface. As a result, traffic is interrupted. Global UCMP avoids this situation by providing more functions.