Interfaces | 483
• 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 23-2. Number of Port-channels per Platform
Platform Port-channels Members/Channel
E-Series TeraScale 255 16
E-Series ExaScale 512 64
C-Series 128 8
S-Series: S25 and S50 52 8
S55, S60 and S4810 128 8
Z9000 128 8
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