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CHAPTER 1 Network Environment Setup and Tool Installation
1.3 Management LAN
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C122-E175-01EN
Because the MMB cannot recognize errors occurring in the path for accessing the MMB user port from the
management LAN, it is unable to recover from them by switching the active MMB. Therefore, two user ports
of the management LAN are mounted on the MMB. This redundant configuration enables recovery from
management LAN errors. The redundant configuration of the user port is disabled as standard, and only user
port #0 is enabled.
When the redundant configuration of the user port of the management LAN is enabled, the NICs on both user
port #0 and user port #1 are enabled. These two NICs appear as one virtual interface from external devices
because of the bonding function (each MMB has a physical address and a MAC address).
The MMB monitors errors of the management LAN (including connections to unit-external switches and LAN
cable disconnections). When it detects an error, it switches the duplicated NIC so that the monitoring
operation, which includes the Web-UI operations, can continue. The values of the physical IP address and
the MAC address of the MMB prior to switching are maintained.
To set up the management LAN in a redundant configuration, select [Network Configuration] - [Network
Interface] from the MMB Web-UI, and then set Enable for [Dualization] of [Maintenance LAN].
For the redundant configuration of the management LAN on the partition side, duplicate the NIC by teaming
with Linux Bonding driver, GLS or Intel PROSet.
When the MMB is duplicated, but the management LAN user port of the MMB is not duplicated, if an error
occurs on the management LAN, MMB access is disabled in PRIMEQUEST 2400E and 2800E. Because the
MMB does not recognize its error, it does not automatically switch the active MMB, and the virtual IP address
of the MMB cannot be switched to the available MMB. In such cases, the active MMB must be switched
manually. The procedure is described below for only PRIMEQUEST 2400E and 2800E.
- (When MMB#0 is active, and MMB#1 is standby, an error occurs during an attempt by the management
LAN to access the user port on the MMB#0 side, and MMB#0 access is disabled)
1. Connect to the physical IP address of the management LAN user port on MMB#1 with telnet/ssh.
2. Execute the following command on MMB#1, and switch the active MMB to MMB#1.
> set active_mmb 1
3. The virtual IP address of the MMB is switched to MMB#1, and access is enabled with the virtual IP
address.