Hibernation wake mechanism on a stack of switches using stacking links
A method and system for facilitating wake-up on a stack of network devices are provided. During operation, the system receives, by a commander device of the stack of network devices, a notification which indicates that the commander device is to wake up from a hibernation state. The commander device boots up in response to receiving the notification. The commander device transmits a wake-up signal to a first member device of the stack of network devices via a first stacking link coupling to the first member device. The system allows the first member device to boot up from the hibernation state in response to detecting the wake-up signal and to transmit the wake-up signal to a second member device via a second stacking link coupling to the second member device.
1 . A method for facilitating wake-up on a stack of network devices, the method comprising:
receiving, by a commander device of the stack of network devices, a notification which indicates that the commander device is to wake up from a hibernation state;
booting up, by the commander device, in response to receiving the notification;
transmitting a wake-up signal as an energy pulse detectable based on a width and amplitude associated with the energy pulse to a first member device of the stack of network devices via a first stacking link coupling to the first member device; and
allowing the first member device to boot up from the hibernation state in response to receiving the energy pulse on the first stacking link and to transmit the wake-up signal as the energy pulse detectable based on the width and amplitude associated with the energy pulse to a second member device via a second stacking link coupling to the second member device.
2 . The method of claim 1 , further comprising:
prior to transmitting the wake-up signal to the first member device, enabling, by the commander device, a port configured as the first stacking link.
3 . The method of claim 1 ,
wherein the notification comprises a packet received from a controller via an Out of Band management (OOBM) interface.
4 . The method of claim 1 ,
wherein the notification is associated with a user operation performed on the commander device.
5 . The method of claim 1 ,
wherein transmitting the wake-up signal comprises transmitting an optical signal over a fiber optic cable.
6 . The method of claim 1 ,
wherein transmitting the wake-up signal comprises transmitting an electrical signal over a direct attach copper (DAC) cable.
7 . The method of claim 1 ,
wherein the wake-up signal comprises a pulse with a predetermined minimum width and a predetermined minimum amplitude.
8 . A commander device in a stack of network devices, the commander device comprising:
at least one processing resource;
a plurality of ports; and
a storage device storing instructions which when executed by the at least one processing resource cause the at least one processing resource to execute the instructions to:
receive a notification indicating that the commander device is to wake up from a hibernation state;
boot up in response to receiving the notification;
transmit a wake-up signal as an energy pulse detectable based on a width and amplitude associated with the energy pulse to a first member device of the stack of network devices via a first stacking link coupling to the first member device; and
allow the first member device to boot up from the hibernation state in response to receiving the energy pulse on the first stacking link and transmit the wake-up signal as the energy pulse detectable based on the width and amplitude associated with the energy pulse to a second member device via a second stacking link coupling to the second member device.
9 . The commander device of claim 8 , the instructions further to:
prior to transmitting the wake-up signal to the first member device, enable a port configured as the first stacking link; and
prior to transmitting the wake-up signal to the second member device, enable a port configured as the second stacking link.
10 . The commander device of claim 8 ,
wherein the notification comprises a packet received from a controller via an out of band management (OOBM) interface.
11 . The commander device of claim 8 ,
wherein the notification is associated with a user operation performed on the commander device.
12 . The commander device of claim 8 , the instructions further to:
transmit the wake-up signal by transmitting an optical signal over a fiber optic cable.
13 . The commander device of claim 8 , the instructions further to:
transmit the wake-up signal by transmitting an electrical signal over a direct attach copper (DAC) cable.
14 . The commander device of claim 8 ,
wherein the wake-up signal comprises a pulse with a predetermined minimum width and a predetermined minimum amplitude.
15 . A stack of network devices, comprising:
a commander device comprising at least one first processor and at least one first non-transitory computer-readable medium storing first instructions; and
one or more member devices, wherein a respective member device comprises at least one second processor and at least one second non-transitory computer-readable medium storing second instructions;
wherein the first instructions when executed by the at least one first processor are to:
receive a notification which indicates that the commander device is to wake up from a hibernation state;
boot up the commander device in response to receiving the notification; and
transmit a wake-up signal as an energy pulse detectable based on a width and amplitude associated with the energy pulse to a first member device via a first stacking link coupling to the first member device; and
wherein the second instructions when executed by the at least one second processor are to:
receive the wake-up signal via the stacking link coupling to the first member device;
boot up a first member device from the hibernation state in response to receiving the energy pulse on the first stacking link; and
transmit the wake-up signal as the energy pulse detectable based on the width and amplitude associated with the energy pulse to a second member device via a second stacking link coupling to the second member device.
16 . The stack of network devices of claim 15 , wherein the first instructions are further to:
enable a port configured as the first stacking link prior to transmitting the wake-up signal to the first member device; and
enable a port configured as the second stacking link prior to transmitting the wake-up signal to the second member device.
17 . The stack of network devices of claim 15 , wherein the notification comprises at least one of:
a packet received from a controller via an out of band management (OOBM) interface; or
a notification associated with a user operation performed on the commander device.
18 . The stack of network devices of claim 15 ,
wherein the wake-up signal comprises at least one of an optical signal transmitted over a fiber optic cable or an electrical signal transmitted over a direct attach copper (DAC) cable.
19 . The stack of network devices of claim 15 ,
wherein transmitting the wake-up signal to the second member device via the second stacking link causes the second member device to:
boot up from the hibernation state in response to detecting the wake-up signal; and
transmit the wake-up signal to a third member device in response to identifying a third stacking link coupling to the third member device.
20 . The stack of network devices of claim 15 ,
wherein one of the member devices comprises a standby device for the commander device.