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• Dynamic—Port channels that are dynamically configured using Link Aggregation Control Protocol
(LACP). For details, see Chapter 24, Link Aggregation Control Protocol.
Table 20-4. As soon as a port channel is configured, FTOS treats it like a physical interface. For
example, IEEE 802.1Q tagging is maintained while the physical interface is in the port channel.
Member ports of a LAG are added and programmed into hardware in a predictable order based on the port
ID, instead of in the order in which the ports come up. With this implementation, load balancing yields
predictable results across line card resets and chassis reloads.
A physical interface can belong to only one port channel at a time.
Each port channel must contain interfaces of the same interface type/speed.
Port channels can contain a mix of 10, 100, or 1000 Mbps Ethernet interfaces and Gigabit Ethernet
interfaces, and the interface speed (10, 100, or 1000 Mbps) used by the port channel is determined by the
first port channel member that is physically up. FTOS disables the interfaces that do match the interface
speed set by the first channel member. That first interface may be the first interface that is physically
brought up or was physically operating when interfaces were added to the port channel. For example, if the
first operational interface in the port channel is a Gigabit Ethernet interface, all interfaces at 1000 Mbps are
kept up, and all 10/100/1000 interfaces that are not set to 1000 speed or auto negotiate are disabled.
FTOS brings up 10/100/1000 interfaces that are set to auto negotiate so that their speed is identical to the
speed of the first channel member in the port channel.
10/100/1000 Mbps interfaces in port channels
When both 10/100/1000 interfaces and GigE interfaces are added to a port channel, the interfaces must
share a common speed. When interfaces have a configured speed different from the port channel speed, the
software disables those interfaces.
Table 20-2. Number of Port-channels per Platform
Platform Port-channels Members/Channel
E-Series 255 16
C-Series 128 8
S-Series: S50 and S25 52 8
S-Series: S55, S60 and S4810 128 8
Table 20-3. Maximum number of configurable Port-channels
Platform Port-channels Members/Channel
E-Series
ExaScale
512 64