Dell Force10 S4820T S4820T Configuration Guide - Page 447

• Port channel definition and standards • Port channel benefits • Port channel implementation • Configuration task list for port channel interfaces Port channel definition and standards Link aggregation is defined by IEEE 802.3ad as a method of grouping multiple physical interfaces into a single logical interface-a Link Aggregation Group (LAG) or port channel. A LAG is "a group of links that appear to a MAC client as if they were a single link" according to IEEE 802.3ad. In FTOS, a LAG is referred to as a port channel interface. A port channel provides redundancy by aggregating physical interfaces into one logical interface. If one physical interface goes down in the port channel, another physical interface carries the traffic. Port channel benefits For the E-Series, a port channel interface provides many benefits, including easy management, link redundancy, and sharing. Port channels are transparent to network configurations and can be modified and managed as one interface. For example, you configure one IP address for the group and that IP address is used for all routed traffic on the port channel. With this feature, the user can create larger-capacity interfaces by utilizing a group of lower-speed links. For example, the user can build a 5-Gigabit interface by aggregating five 1-Gigabit Ethernet interfaces together. If one of the five interfaces fails, traffic is redistributed across the four remaining interfaces. Port channel implementation FTOS supports two types of port channels: • Static-Port channels that are statically configured • Dynamic-Port channels that are dynamically configured using Link Aggregation Control Protocol (LACP). For details, see Link Aggregation Control Protocol (LACP). Table 22-2. Number of Port-channels per Platform Platform E-Series TeraScale E-Series ExaScale C-Series S-Series: S25 and S50 S55, S60, S4810 and S4820T Z9000 Port-channels 255 512 128 52 128 128 Members/Channel 16 64 8 8 8 8 Interfaces | 447