Chapter 3. Configuring The Cn4093 - Lenovo Flex System Fabric CN4093 Installation Manual

Chapter 3. Configuring the CN4093

© Copyright Lenovo 2017
The switch has an internal Ethernet path to the Chassis Management Module
(CMM), the external Ethernet data ports, an external management port, and a
serial console port. The switch supports two remote‐access modes for management
through Ethernet connections. You can select the mode that is best suited for your
Lenovo Flex System environment.
 Default mode: The default mode uses the internal path to the CMM only. In this
mode, the remote‐access link to the management console must be attached to the
Ethernet connector on the CMM. The Internet Protocol (IP) addresses and
Simple Network Management Protocol (SNMP) parameters of the switch can be
automatically assigned by the Lenovo Director Flex System Deployment wizard
(when available), or you must assign them through the Lenovo Flex System
Management and Configuration program. This mode enables you to provide a
secure LAN for management of the Lenovo Flex Systems subsystems that is
separate from the data network. See "Establishing an Interface Through the
CMM" on page 39 for more information.
 External management mode: External management mode allows for the use of
alternate management entities to control and configure the switch. You must
enable external management in order to manage the switch using the dedicated
external management port (EXTM) or any of the external data ports
(EXT1‐EXT22, in‐band switch management). This mode can be used instead of
or in addition to access through the CMM. This mode can be enabled only
through the CMM configuration interface. When this mode is enabled, the
external ports support both management and data traffic.
This mode enables the use of additional switch IP addresses on different IP
subnets than the CMMs. This is useful when the switches are to be managed and
controlled as part of the overall network infrastructure, while secure
management of other Lenovo Flex System subsystems is maintained through
the CMM. See "Enabling Management Through Data Ports" on page
additional instructions about configuring the switch for this mode of operation.
The RS‐232 console port provides an alternative path to manage and configure the
switch for local access.
Important:
 Before you configure the switch, make sure that the CMM is correctly
configured. For more information about configuring the CMM, see the
following documents:
– Lenovo Flex System Chassis Management Module Installation Guide
– Lenovo Flex System Chassis Management Module User's Guide
 The initial default IP address assigned to the switch by the CMM is
192.168.70.120, 192.168.70.121, 192.168.70.122, or 192.168.70.123 depending on
the bay where the switch is installed.
 If you change the IP address of the switch and restart the Lenovo Flex System
chassis, the switch maintains this new IP address as its default value.
 The CMM and the switch can communicate with each other only if they are on
the same IP subnet.
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