Dell PowerEdge M420 Dell PowerConnect M6220/M6348/M8024/M8024-k CLI Referen - Page 575

A LAG failure of one or more of the links does not stop traffic in any manner. Upon failure, the flows mapped to a link are dynamically reassigned to the remaining links of the LAG. Similarly when links are added to a LAG, the conversations may need to be shifted to a new link. The purpose of link aggregation is to increase bandwidth between two switches. It is achieved by aggregating multiple ports in one logical group. A common problem of port channels is the possibility of changing packets order in a particular TCP session. The resolution of this problem is correct selection of physical port within port channel for transmitting the packet to keep original packets order. The hashing algorithm is configurable for each LAG. The types of LAG algorithms available may vary depending upon platform capabilities. Typically, an administrator is able to choose from hash algorithms utilizing the following attributes of a packet to determine the outgoing port: • Source MAC, VLAN, EtherType, and incoming port associated with the packet. • Source IP and Source TCP/UDP fields of the packet. • Destination MAC, VLAN, EtherType, and incoming port associated with the packet. • Source MAC, Destination MAC, VLAN, EtherType, and incoming port associated with the packet. • Destination IP and Destination TCP/UDP Port fields of the packet. • Source/Destination MAC, VLAN, EtherType, and incoming port associated with the packet. • Source/Destination IP and source/destination TCP/UDP Port fields of the packet. LAG Hashing The purpose of link aggregation is to increase bandwidth between two switches. It is achieved by aggregating multiple ports in one logical group. A common problem of port channels is the possibility of changing packets order in a particular TCP session. The resolution of this problem is correct selection of a physical port within the port channel for transmitting the packet to keep original packets order. Port Channel Commands 575