Operating instructions

234 Cisco Systems Intelligent Gigabit Ethernet Switch Module
condition (in the config term mode, run the command no monitor session x, where x is the
monitor session number configured for RSPAN use).
Detecting Management Module settings from the IGESM
Besides the IP addressing information that the Management Module controls on the IGESM
by default, there are other areas in which the Management Module has direct control over
IGESM settings. In most cases it is possible to log into the Management Module and confirm
these settings, but in some environments at some times, the person who administers the
IGESM does not have permission to log into the Management Module.
There are ways for a person logged into the IGESM to see the settings on the Management
Module from the IGESM.
Of the four settings in the Advanced section of I/O Module configuration for each IGESM,
three can directly effect the management and flow of data to and through the IGESM. These
can be seen in Figure 9-2 on page 235 and are defined as:
򐂰 External ports
–
Enabled: Ports G0/17 through 20 can be controlled on the IGESM.
–
Disabled (default): Ports g0/17 through 20 will be down and can be brought up on the
IGESM only after this setting is changed to Enabled on the Management Module.
򐂰 External management over all ports
–
Enabled: IGESM management path is over the IGESM uplinks.
–
Disabled (default): IGESM management path is over the Management Module uplinks.
򐂰 Preserve new IP address on all resets
–
Enabled (default): IP address information (IP address, mask, and default gateway) are
controlled by the settings in the Management Module. Every time the IGESM or
Management Module reboots, the IGESM obtains the IP values stored on the
Management Module, not the values stored in the IGESM’s NVRAM.
–
Disabled: IGESM obtains the IP address stored in NVRAM of the IGESM upon IGESM
reboot.
Important: We recommend extreme caution when using the RSPAN feature on the Cisco
Systems IGESM if you are not using 12.1(14)AY1 or a later revision of the code.
Important: Setting this value to Enabled or Disabled implies that certain other rules
are being followed to support the desired management path. See 5.3, “In-depth
management path discussions” on page 55 for details.
Changing this value without understanding these rules will more than likely result in
intermittent or no management connectivity to the IGESM.
Important: Changing this value from Enabled (the default) to Disabled does not
allow the IGESM to fully control its own IP addressing information. In the event the
IGESM reloads (and this setting is Disabled), the IGESM will get its IP addressing
information from its own NVRAM. However, if you reload the Management Module,
the IGESM will be updated with the Management Module IGESM IP addressing
information. Therefore, you are recommended to leave this value set to Enabled.