Interface Addition To A Portchannel - Cisco MDS 9000 Series Configuration Manual

Configuring PortChannels
Note For information about PortChannel support on Generation 2 switching modules, see the
Limitations, on page

Interface Addition to a PortChannel

You can add 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.
A port can be configured as a member of a static PortChannel only if the following configurations are the
same in the port and the PortChannel:
• Speed
• Mode
• Rate mode
• Port VSAN
• Trunking mode
• Allowed VSAN list or VF-ID list
After the members are added, regardless of the mode (ACTIVE and ON) used, the ports at either end are
gracefully brought down, indicating that no frames are lost when the interface is going down (see the
1 PortChannel Limitations, on page 232
Compatibility Check
A compatibility check ensures that the same parameter settings are used in all physical ports in the channel.
Otherwise, they cannot become part of a PortChannel. The compatibility check is performed before a port is
added to the PortChannel.
The check ensures that the following parameters and settings match at both ends of a PortChannel:
• Capability parameters (type of interface, Gigabit Ethernet at both ends, or Fibre Channel at both ends).
• Administrative compatibility parameters (speed, mode, rate mode, port VSAN, allowed VSAN list, and
Note
Ports in shared rate mode cannot form a PortChannel or a trunking PortChannel.
• Operational parameters (remote switch WWN and trunking mode).
A port addition procedure fails if the capability and administrative parameters in the remote switch are
incompatible with the capability and administrative parameters in the local switch. If the compatibility check
is successful, the interfaces are operational and the corresponding compatibility parameter settings apply to
these interfaces.
Suspended and Isolated States
If the operational parameters are incompatible, the compatibility check fails and the interface is placed in a
suspended or isolated state based on the configured mode:
• An interface enters the suspended state if the interface is configured in the ON mode.
87.
port security).
and Graceful Shutdown, on page
Cisco MDS 9000 Series Interfaces Configuration Guide, Release 8.x
Interface Addition to a PortChannel
PortChannel
Generation
23).
225