Dell Force10 E300, Configuration Manual

Page: 542 / 1262

542 | Link Aggregation Control Protocol
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LACP functions by constantly exchanging custom MAC PDUs across LAN Ethernet links. The protocol
packets are only exchanged between ports that are configured as LACP capable.
Important Points to Remember
• On ExaScale, LACP is supported on 200 physical ports. Use static LAGs for the remaining ports to
avoid unpredictable results.
• LACP enables you to add members to a port channel (LAG) as long as it has no static members.
Conversely, if the LAG already contains a statically defined member (
channel-member
command),
the
port-channel mode
command is not permitted.
• A static LAG cannot be created if a dynamic LAG using the selected number already exists.
• No dual membership in static and dynamic LAGs :
• If a physical interface is a part of a static LAG, then the command
port-channel-protocol lacp
will
be rejected on that interface.
• If a physical interface is a part of a dynamic LAG, it cannot be added as a member of a static LAG.
The command
channel-member gigabitethernet
x/y
will be rejected in the static LAG interface
for that physical interface.
• A dynamic LAG can be created with any type of configuration.
• There is a difference between the
shutdown
and
no interface port-channel
:
— The
shutdown
command on LAG “xyz” disables the LAG and retains the user
commands. However, the system does not allow the channel number “xyz” to be statically
created.
— The command
no interface port-channel
channel-number
deletes the specified LAG,
including a dynamically created LAG. This command causes all LACP-specific
commands on the member interfaces to be removed. The interfaces are restored to a state
that is ready to be configured.
Note:
There will be no configuration on the interface since that condition is required for an
interface to be part of a LAG
.
• Link dampening can be configured on individual members of a LAG. See Link Debounce Timer on
page 446 for more information.
• LACP cannot add an interface to a LAG if one of the LAG members is shut down on the remote
interface. If a remote LAG member is shut down,
Message 1 appears on the local system when you
attempt to add a member. In this case, enable all members of the LAG on the remote system, and then
add any new members on the local system.
• FTOS might not synch connected and static routes learned via LACP to the secondary RPM.
Configure
redundancy protocol lacp
to synch LACP states between RPMs.
Message 1 LACP Remote Port Down Error Message
% Error: This port property does not match with other LAG member.