Alcatel-Lucent OS9-GNI-U24 User Manual
Alcatel-Lucent
Page 17
OmniSwitch 9000
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Hot swapping a CMM refers to the action of adding, removing, or replacing a CMM module while the switch is operating.
You are not required to enter a CLI command in order to hot swap CMM modules. This function can be performed on the
fly by simply removing the module from the switch chassis.
Note. Hot Swapping the CMM module is not possible on the OS9600 because it contains only one CMM slot.
You are not required to enter a CLI command in order to hot swap CMM modules. This function can be performed on the
fly by simply removing the module from the switch chassis.
Note. Hot Swapping the CMM module is not possible on the OS9600 because it contains only one CMM slot.
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On-the-fly module removal is provided through the presence signaling function. All modules in the switch send out
“presence signals.” When a module sends out this signal, it is essentially advertising to all other modules in the switch that
it is present in the chassis. When a module is present, information such as its module type (primary CMM, secondary
CMM, ENI, or GNI) becomes available for monitoring functions. The presence signal is controlled through a shortened
connector pin that interfaces with the switch’s backplane.
Because this connector pin is shorter than the module’s other backplane connectors, the presence signal connection is the
first to become interrupted when a board is removed from the chassis. This allows the switch additional time
(approximately 5 ms) to complete the current transfer of data before the module is completely disconnected.
(In order to avoid data loss, the switch immediately stops incoming traffic and flushes outgoing traffic on the module
being removed.)
Note. Although presence signaling is designed to maintain data flow on the switch during the hot swap procedure,
uninterrupted data flow cannot be guaranteed. As a result, you should not hot swap NI or CMM modules during critical
network activity.
“presence signals.” When a module sends out this signal, it is essentially advertising to all other modules in the switch that
it is present in the chassis. When a module is present, information such as its module type (primary CMM, secondary
CMM, ENI, or GNI) becomes available for monitoring functions. The presence signal is controlled through a shortened
connector pin that interfaces with the switch’s backplane.
Because this connector pin is shorter than the module’s other backplane connectors, the presence signal connection is the
first to become interrupted when a board is removed from the chassis. This allows the switch additional time
(approximately 5 ms) to complete the current transfer of data before the module is completely disconnected.
(In order to avoid data loss, the switch immediately stops incoming traffic and flushes outgoing traffic on the module
being removed.)
Note. Although presence signaling is designed to maintain data flow on the switch during the hot swap procedure,
uninterrupted data flow cannot be guaranteed. As a result, you should not hot swap NI or CMM modules during critical
network activity.
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When installing modules in the chassis, consider the following:
• NI modules may be installed in any slot position from 1 through 16 in OS9800 switches, from 1 through 8 in OS9700,
and from 1 through 4 in OS9600 switches.
• CMMs may be installed in slots A or B in OS9800 and OS9700, and in slot A in OS9600 switches.
• NI modules cannot be installed in CMM slots A or B; likewise, CMMs cannot be installed in any NI slot position.
• NI modules may be installed in any slot position from 1 through 16 in OS9800 switches, from 1 through 8 in OS9700,
and from 1 through 4 in OS9600 switches.
• CMMs may be installed in slots A or B in OS9800 and OS9700, and in slot A in OS9600 switches.
• NI modules cannot be installed in CMM slots A or B; likewise, CMMs cannot be installed in any NI slot position.
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The primary and secondary CMM modules can trade roles. In other words, the CMM that is currently functioning as the
secondary CMM can be assigned to “take over” the role of the primary CMM. The primary CMM then assumes the
secondary role. Because this action is coordinated between the two CMM modules, switch management functions are
maintained during the takeover.
secondary CMM can be assigned to “take over” the role of the primary CMM. The primary CMM then assumes the
secondary role. Because this action is coordinated between the two CMM modules, switch management functions are
maintained during the takeover.
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The switch’s base MAC address is not tied to the CMM module. Instead, the switch provides an EEPROM card near the
chassis backplane that stores the MAC address. This allows the switch to retain the MAC address when a CMM module is
removed or replaced.
MAC EEPROM Redundancy: A second EEPROM is provided for redundancy. An EEPROM card can be removed and
replaced in the field by an authorized Alcatel.Lucent Support Engineer in the unlikely event of an EEPROM failure.
chassis backplane that stores the MAC address. This allows the switch to retain the MAC address when a CMM module is
removed or replaced.
MAC EEPROM Redundancy: A second EEPROM is provided for redundancy. An EEPROM card can be removed and
replaced in the field by an authorized Alcatel.Lucent Support Engineer in the unlikely event of an EEPROM failure.