Operating instructions

200 Cisco Systems Intelligent Gigabit Ethernet Switch Module
7.8.2 Configuring Serial over LAN
This section provides an example of configuring SoL on an IGESM.
Introduction to configuring Serial over LAN
Successfully configuring Serial over LAN in the IBM BladeCenter involves several items. At a
minimum you should configure both the Management Module and the IGESM. As already
noted, depending on the blade servers installed, you may also need to configure both the
CMOS/BIOS settings and the operating system on the server to also support Serial over LAN.
This section discusses configuring only the IGESM and does not cover configuring the blade
servers themselves or the Management Module.
Configuring the IGESM
Step-by-step instructions to configure the IGESM for SoL
Table 7-21 shows the step-by-step instructions used to configure IGESM in the top bay.
Table 7-21 Configuring IGESM for Serial over LAN
Important: In most cases, Serial over LAN is only supported on the IGESM installed in
switch bay 1. At least one model of blade server offers a jumper to enable Serial over LAN
through the switch in bay 2. See the Serial over LAN configuration guide for details.
Description and comments Actions via IOS CLI for the IGESM
Step 1: Create the desired VLAN to be used for SoL.
(In this example we use VLAN 4094.)
Switch must be in VTP Transparent mode to use this specific VLAN.
Perform the commands in this table starting from a Telnet session to
the IGESM, with the IGESM in the Enable mode.
The SoL VLAN will only be specific to this IGESM, and can be used
by other switches in the network, as the SoL VLAN on this switch will
be isolated from other switches by the commands in step 2.
Naming the VLAN in this step is optional, and is only for the
convenience of future users reviewing the switch configuration.
Whatever VLAN you define as the SoL VLAN in this section, it must
match the SoL VLAN as configured on the Management Module.
config t
vlan 4094
name SoL
Step 2: Remove the SoL VLAN from the external uplinks.
This must be the same VLAN defined in step 1.
This isolates the SoL VLAN to this BladeCenter.
int range g0/17 -20
switchport trunk allowed vlan remove 4094
Step 3: Add the SoL VLAN on the links going from the IGESM to the
Management Modules and the blade servers.
This must be the same VLAN as defined in step 1.
This enables the SoL traffic on the link between the IGESM and the
Management Module as well as to the blade servers.
Ports to blade servers must be in trunk mode (not access). You can
simulate the blade server in Access mode by making it a trunk link
and setting the native VLAN to the desired Access VLAN.
int range g0/1 -16
switchport trunk allowed vlan add 4094
Step 4: Exit config mode and save config to NVRAM.
The end command exits out of config mode.
Failure to perform this step results in losing all changes to the IGESM
if the BladeCenter is powered off or the IGESM is otherwise restarted.
end
write