Portchannel Deletion; Interfaces In A Portchannel - Cisco MDS 9000 Series Configuration Manual

PortChannel Deletion

Table 27: Channel Group Configuration Differences
ON Mode
No protocol is exchanged.
Moves interfaces to the suspended state if its
operational values are incompatible with the
PortChannel.
When you add or modify a PortChannel member port
configuration, you must explicitly disable (shut) and
enable (no shut) the PortChannel member ports at
either end.
Port initialization is not synchronized.
All misconfigurations are not detected as no protocol
is exchanged.
Transitions misconfigured ports to the suspended
state. You must explicitly disable (shut) and enable
(no shut) the member ports at either end.
This is the default mode.
PortChannel Deletion
When you delete the PortChannel, the corresponding channel membership is also deleted. All interfaces in
the deleted PortChannel convert to individual physical links. After the PortChannel is removed, regardless of
the mode used (ACTIVE and ON), the ports at either end are gracefully brought down, indicating that no
frames are lost when the interface is going down (see the
If you delete the PortChannel for one port, then the individual ports within the deleted PortChannel retain the
compatibility parameter settings (speed, mode, port VSAN, allowed VSAN, and port security). You can
explicitly change those settings as required.
• If you use the default ON mode to avoid inconsistent states across switches and to maintain consistency
• If you use the ACTIVE mode, then the PortChannel ports automatically recover from the deletion.

Interfaces in a PortChannel

You can add or remove a physical interface (or a range of interfaces) to an existing PortChannel. The compatible
parameters on the configuration are mapped to the PortChannel. Adding an interface to a PortChannel increases
the channel size and bandwidth of the PortChannel. Removing an interface from a PortChannel decreases the
channel size and bandwidth of the PortChannel.
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across switches, then the ports shut down. You must explicitly enable those ports again.
ACTIVE Mode
A PortChannel protocol negotiation is performed with
the peer ports.
Moves interfaces to the isolated state if its operational
values are incompatible with the PortChannel.
When you add or modify a PortChannel interface, the
PortChannel automatically recovers.
There is synchronized startup of all ports in a channel
across peer switches.
Consistently detect misconfigurations using a
PortChannel protocol.
Transitions misconfigured ports to the isolated state to
correct the misconfiguration. Once you correct the
misconfiguration, the protocol ensures automatic
recovery.
You must explicitly configure this mode.
Graceful Shutdown, on page
Configuring PortChannels
23).