Installa NX-OS sullo switch Cisco Nexus 9332D-GX2B
Installa NX-OS sugli switch Cisco Nexus 9332D-GX2B per nuove installazioni di sistemi AFX 1K o AFX 2K, per la sostituzione di switch o quando ripristini uno switch alle impostazioni di fabbrica.
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L'interruttore (o gli interruttori) deve essere acceso e devi aver completato la procedura "Completa la configurazione iniziale dello switch".
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Se stai installando NX-OS su uno o più switch come parte di una nuova installazione del sistema AFX o della sostituzione di uno switch, verifica che la versione di NX-OS sui tuoi switch sia la versione attualmente supportata da NetApp.
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Se il/i tuo/i switch hanno la versione corrente supportata da NetApp, non devi installare NX-OS. Devi installare l'RCF. Inizia con "Installa o aggiorna la panoramica RCF".
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Se i tuoi switch non dispongono della versione attualmente supportata da NetApp, continua con questa procedura per installare NX-OS.
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Se installi NX-OS su uno switch come parte di una sostituzione dello switch o di un ripristino alle impostazioni di fabbrica, verifica che il tuo cluster sia completamente funzionante, cioè che non ci siano errori nei log o problemi simili.
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Se stai installando NX-OS come parte di una nuova installazione del sistema AFX, puoi saltare questo requisito perché i controller nel tuo sistema AFX non sono ancora accesi in questa fase dell'installazione e configurazione del sistema AFX. |
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La versione di ONTAP in esecuzione sul tuo sistema AFX determina le versioni di NX-OS supportate per i tuoi switch.
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Per gli switch in un sistema AFX 1K, con qualsiasi versione supportata di ONTAP, è supportato NX-OS 10.4.2 e versioni successive.
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Per gli switch in un sistema AFX 2K, che eseguono ONTAP 9.19.1GA o versioni successive, è supportato NX-OS 10.6 e versioni successive.
Per l'elenco aggiornato delle versioni di NX-OS supportate, vedi la pagina "Switch Ethernet NetApp Cisco".
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Questa procedura richiede solo l'utilizzo dei comandi degli switch Cisco Nexus 9000 Series.
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Negli esempi di questa procedura, il primo switch viene indicato come cs1 e il secondo come cs2.
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Se hai installato switch come parte di una nuova installazione di sistema AFX 1K o AFX 2K, questa procedura ti fa installare NX-OS sul primo switch (cs1) e poi ti fa ripetere i passaggi per il secondo switch (cs2).
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Gli esempi mostrati in questa procedura si riferiscono a sistemi AFX 1K con switch che utilizzano RCF 10.0. Se hai un sistema AFX 2K, l'input e l'output possono variare.
Passaggio 1: Preparati a installare NX-OS
Preparati a installare NX-OS sullo/sugli switch assicurandoti di avere accesso a un server con la versione supportata di NX-OS, scaricare NX-OS, connetterti alla rete di gestione per il trasferimento dei file e poi verificare la connettività al server.
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Devi avere accesso a un server HTTP, FTP o TFTP. Avere accesso a uno di questi server ti permette di scaricare una versione supportata di NX-OS.
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Scarica la versione corretta di NX-OS e l'immagine EPLD per lo/gli switch dalla "Scarica il software Cisco" pagina.
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Collega lo switch alla rete di gestione (per il trasferimento dei file).
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Verifica la connettività al server che ospita NX-OS usando il comando ping.
ping <IP address>Mostra esempio
Questo esempio verifica che lo switch possa raggiungere il server all'indirizzo IP 172.19.2.1:
cs1# ping 172.19.2.1 Pinging 172.19.2.1 with 0 bytes of data: Reply From 172.19.2.1: icmp_seq = 0. time= 5910 usec.
Passaggio 2: Installa l'immagine NX-OS ed EPLD
Installa e verifica l'immagine NX-OS e EPLD sul primo switch (cs1), quindi ripeti questi passaggi sul secondo switch (cs2) se stai installando NX-OS nell'ambito di una nuova installazione di un sistema AFX.
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Installa l'immagine NX-OS ed EPLD.
Scegli la scheda che si applica alla tua situazione:
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Installa 10.4(2)F
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Installa 10.6(3)F o una versione successiva
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Per i passaggi successivi, utilizzi l'interfaccia a riga di comando (CLI) dello switch per immettere i comandi.
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Copia le immagini NX-OS e EPLD sul primo switch.
Usi questo comando due volte: la prima per copiare la versione di NX-OS e la seconda per copiare la versione di EPLD.
copy <protocol>: bootflash: vrf managementMostra esempio
L'esempio utilizza sftp.
cs1# copy sftp: bootflash: vrf management Enter source filename: /code/nxos.10.4.2.bin Enter hostname for the sftp server: 172.19.2.1 Enter username: root Outbound-ReKey for 172.19.2.1:22 Inbound-ReKey for 172.19.2.1:22 root@172.19.2.1's password: sftp> progress Progress meter enabled sftp> get /code/nxos.10.4.2.bin /bootflash/nxos.10.4.2.bin /code/nxos.10.4.2.bin 100% 1261MB 9.3MB/s 02:15 sftp> exit Copy complete, now saving to disk (please wait)... Copy complete. cs1# copy sftp: bootflash: vrf management Enter source filename: /code/n9000-epld.10.4.2.F.img Enter hostname for the sftp server: 172.19.2.1 Enter username: user1 Outbound-ReKey for 172.19.2.1:22 Inbound-ReKey for 172.19.2.1:22 user1@172.19.2.1's password: sftp> progress Progress meter enabled sftp> get /code/n9000-epld.10.4.2.F.img /bootflash/n9000-epld.10.4.2.F.img /code/n9000-epld.10.4.2.F.img 100% 161MB 9.5MB/s 00:16 sftp> exit Copy complete, now saving to disk (please wait)... Copy complete.
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Verifica la versione di NX-OS in esecuzione:
show versionMostra esempio
cs1# show version Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (C) 2002-2025, Cisco and/or its affiliates. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under their own licenses, such as open source. This software is provided "as is," and unless otherwise stated, there is no warranty, express or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or GNU General Public License (GPL) version 3.0 or the GNU Lesser General Public License (LGPL) Version 2.1 or Lesser General Public License (LGPL) Version 2.0. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://opensource.org/licenses/gpl-3.0.html and http://www.opensource.org/licenses/lgpl-2.1.php and http://www.gnu.org/licenses/old-licenses/library.txt. Software BIOS: version 01.14 NXOS: version 10.4(1) [Feature Release] Host NXOS: version 10.4(1) BIOS compile time: 11/25/2024 NXOS image file is: bootflash:///nxos64-cs.10.4.1.F.bin NXOS compile time: 11/30/2023 12:00:00 [12/14/2023 05:25:50] NXOS boot mode: LXC Hardware cisco Nexus9000 C9332D-GX2B Chassis Intel(R) Xeon(R) CPU D-1633N @ 2.50GHz with 32802156 kB of memory. Processor Board ID FLMXXXXXXXX Device name: cs2 bootflash: 115802886 kB Kernel uptime is 5 day(s), 2 hour(s), 13 minute(s), 21 second(s) Last reset at 3580 usecs after Thu Jun 5 15:55:08 2025 Reason: Reset Requested by CLI command reload System version: 10.4(1) Service: plugin Core Plugin, Ethernet Plugin Active Package(s): cs1#
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Installare l'immagine NX-OS.
L'installazione del file immagine fa sì che venga caricato ogni volta che lo switch si riavvia.
install all nxos bootflash:nxos.<version number>.binMostra esempio
L'esempio utilizza la versione 10.4.2 di NX-OS.
cs1# install all nxos bootflash:nxos.10.4.2.bin Installer will perform compatibility check first. Please wait. Installer is forced disruptive Verifying image bootflash:/nxos.10.4.2.bin for boot variable "nxos". [] 100% -- SUCCESS Verifying image type. [] 100% -- SUCCESS Preparing "nxos" version info using image bootflash:/nxos.10.4.2.bin. [] 100% -- SUCCESS Preparing "bios" version info using image bootflash:/nxos.10.4.2.bin. [] 100% -- SUCCESS Performing module support checks. [] 100% -- SUCCESS Notifying services about system upgrade. [] 100% -- SUCCESS Compatibility check is done: Module Bootable Impact Install-type Reason ------ -------- --------------- ------------ --------- 1 yes Disruptive Reset Default upgrade is not hitless Images will be upgraded according to following table: Module Image Running-Version(pri:alt) New-Version Upg-Required ------- --------- ---------------------------------------- ------------------- ------------ 1 nxos 10.4(1) 10.4(2) Yes 1 bios xx.xx.:xx.xx xxx No Switch will be reloaded for disruptive upgrade. Do you want to continue with the installation (y/n)? [n] y Install is in progress, please wait. Performing runtime checks. [] 100% -- SUCCESS Setting boot variables. [] 100% -- SUCCESS Performing configuration copy. [] 100% -- SUCCESS Module 1: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. [] 100% -- SUCCESS Finishing the upgrade, switch will reboot in 10 seconds.
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Verifica la nuova versione di NX-OS dopo il riavvio dello switch:
show version
Mostra esempio
cs1# show version Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (C) 2002-2025, Cisco and/or its affiliates. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under their own licenses, such as open source. This software is provided "as is," and unless otherwise stated, there is no warranty, express or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or GNU General Public License (GPL) version 3.0 or the GNU Lesser General Public License (LGPL) Version 2.1 or Lesser General Public License (LGPL) Version 2.0. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://opensource.org/licenses/gpl-3.0.html and http://www.opensource.org/licenses/lgpl-2.1.php and http://www.gnu.org/licenses/old-licenses/library.txt. Software BIOS: version 01.14 NXOS: version 10.4(2) [Feature Release] Host NXOS: version 10.4(2) BIOS compile time: 11/25/2024 NXOS image file is: bootflash:///nxos64-cs.10.4.2.F.bin NXOS compile time: 11/30/2023 12:00:00 [12/14/2023 05:25:50] NXOS boot mode: LXC Hardware cisco Nexus9000 C9332D-GX2B Chassis Intel(R) Xeon(R) CPU D-1633N @ 2.50GHz with 32802156 kB of memory. Processor Board ID FLMXXXXXXXX Device name: cs1 bootflash: 115802886 kB Kernel uptime is 5 day(s), 2 hour(s), 13 minute(s), 21 second(s) Last reset at 3580 usecs after Thu Jun 5 15:55:08 2025 Reason: Reset Requested by CLI command reload System version: 10.4(2) Service: plugin Core Plugin, Ethernet Plugin Active Package(s): cs1#
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Aggiorna l'immagine EPLD utilizzando i seguenti comandi:
show version module 1 epldinstall epld bootflash:n9000-epld.<version>.img module allDopo l'esecuzione dell'ultimo comando, lo switch si riavvia.
Mostra esempio
L'esempio utilizza la versione EPLD 10.4(2)F
cs1# show version module 1 epld EPLD Device Version --------------------------------------- MI FPGA 0x7 IO FPGA 0x17 MI FPGA2 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2 cs1# install epld bootflash:n9000-epld.10.4.2.F.img module all Compatibility check: Module Type Upgradable Impact Reason ------ ------------------ ----------------- --------- ----------- 1 SUP Yes disruptive Module Upgradable Retrieving EPLD versions.... Please wait. Images will be upgraded according to following table: Module Type EPLD Running-Version New-Version Upg-Required ------- ------ ----------------- ----------------- ------------ ------------ 1 SUP MI FPGA 0x07 0x07 No 1 SUP IO FPGA 0x17 0x19 Yes 1 SUP MI FPGA2 0x02 0x02 No The above modules require upgrade. The switch will be reloaded at the end of the upgrade Do you want to continue (y/n) ? [n] y Proceeding to upgrade Modules. Starting Module 1 EPLD Upgrade Module 1 : IO FPGA [Programming] : 100.00% ( 64 of 64 sectors) Module 1 EPLD upgrade is successful. Module Type Upgrade-Result -------- ----- -------------- 1 SUP Success EPLDs upgraded. Module 1 EPLD upgrade is successful.-
Dopo il riavvio dello switch, accedi e verifica che la nuova versione di EPLD sia stata caricata correttamente:
show version module 1 epld
Mostra esempio
cs1# show version module 1 epld EPLD Device Version --------------------------------------- MI FPGA 0x7 IO FPGA 0x19 MI FPGA2 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2
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Per i passaggi successivi, utilizzi l'interfaccia a riga di comando (CLI) dello switch per immettere i comandi.
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Copia l'immagine NX-OS e EPLD sul primo switch:
copy <protocol>: bootflash: vrf managementEsempio
cs1# *copy sftp: bootflash: vrf management* Enter source filename: */code/nxos.10.6.3.F.bin* Enter hostname for the sftp server: *172.19.2.1* Enter username: *user1* Outbound-ReKey for 172.19.2.1:22 Inbound-ReKey for 172.19.2.1:22 user1@172.19.2.1's password: sftp> *progress* Progress meter enabled sftp> *get /code/nxos.10.6.3.F.bin /bootflash/nxos.10.6.3.F.bin* /code/nxos.10.6.3.F.bin 100% 1261MB 9.3MB/s 02:15 sftp> *exit* Copy complete, now saving to disk (please wait)... Copy complete. cs1# *copy sftp: bootflash: vrf management* Enter source filename: */code/n9000-epld.10.6.3.F.img* Enter hostname for the sftp server: *172.19.2.1* Enter username: *user1* Outbound-ReKey for 172.19.2.1:22 Inbound-ReKey for 172.19.2.1:22 user1@172.19.2.1's password: sftp> *progress* Progress meter enabled sftp> *get /code/n9000-epld.10.6.3.F.img /bootflash/n9000-epld.10.6.3.F.img* /code/n9000-epld.10.6.3.F.img 100% 161MB 9.5MB/s 00:16 sftp> *exit* Copy complete, now saving to disk (please wait)... Copy complete.
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Verifica la versione di NX-OS in esecuzione:
show versionEsempio
cs1# *show version* Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (C) 2002-2020, Cisco and/or its affiliates. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under their own licenses, such as open source. This software is provided "as is," and unless otherwise stated, there is no warranty, express or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or GNU General Public License (GPL) version 3.0 or the GNU Lesser General Public License (LGPL) Version 2.1 or Lesser General Public License (LGPL) Version 2.0. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://opensource.org/licenses/gpl-3.0.html and http://www.opensource.org/licenses/lgpl-2.1.php and http://www.gnu.org/licenses/old-licenses/library.txt. Software BIOS: version 08.38 NXOS: version 10.6.3(F) BIOS compile time: 05/29/2020 NXOS image file is: bootflash:///nxos.10.6.3.F.bin NXOS compile time: 4/28/2020 21:00:00 [04/29/2020 02:28:31] Hardware cisco Nexus9000 C9336C-FX2 Chassis Intel(R) Xeon(R) CPU E5-2403 v2 @ 1.80GHz with 8154432 kB of memory. Processor Board ID FOC20291J6K Device name: cs1 bootflash: 53298520 kB Kernel uptime is 0 day(s), 0 hour(s), 3 minute(s), 42 second(s) Last reset at 157524 usecs after Mon Nov 2 18:32:06 2020 Reason: Reset Requested by CLI command reload System version: 9.3(4) Service: plugin Core Plugin, Ethernet Plugin Active Package(s): cs1#
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Installa le immagini NX-OS ed EPLD.
L'immagine EPLD non viene aggiornata automaticamente quando esegui l'aggiornamento a NX-OS 10.6(3)F e versioni successive. Dopo aver completato l'aggiornamento e dopo il riavvio dello switch, devi eseguire di nuovo lo stesso comando di aggiornamento install all.
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La seconda fase di aggiornamento verifica, ma salta l'aggiornamento di NX-OS; viene aggiornata solo l'immagine EPLD.
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Quando hai già eseguito l'aggiornamento a NX-OS 10.6(3)F e versioni successive, entrambe le immagini vengono aggiornate contemporaneamente.
+ L'installazione del file immagine fa sì che questo venga caricato ogni volta che lo switch viene riavviato.
+ L'esempio seguente mostra un aggiornamento da NX-OS 10.4(2)F a 10.6(3)F. Il primo passaggio esegue l'aggiornamento di NX-OS e il secondo passaggio esegue l'aggiornamento dell'immagine EPLD.
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install all nxos bootflash:nxos.<version number>.bin
+ .Esempio
Details
cs1# *install all nxos bootflash:nxos.10.6.3.F.bin* <---- 1st pass updates NX-OS only Installer will perform compatibility check first. Please wait. Installer is forced disruptive Verifying image bootflash:/nxos.10.6.3.F.bin for boot variable "nxos". [####################] 100% -- SUCCESS Verifying image type. [####################] 100% -- SUCCESS Preparing "nxos" version info using image bootflash:/nxos.10.6.3.F.bin. [####################] 100% -- SUCCESS Preparing "bios" version info using image bootflash:/nxos.10.6.3.F.bin. [####################] 100% -- SUCCESS Performing module support checks. [####################] 100% -- SUCCESS Notifying services about system upgrade. [####################] 100% -- SUCCESS Compatibility check is done: Module Bootable Impact Install-type Reason ------ -------- --------------- ------------ --------- 1 yes Disruptive Reset Default upgrade is not hitless Images will be upgraded according to following table: Module Image Running-Version(pri:alt) New-Version Upg-Required ------- --------- ---------------------------------------- -------------------- ------------ 1 nxos 10.4(2)(F) 10.6(3)(F) yes 1 bios v05.47(04/28/2022):v05.47(04/28/2022) v05.53(01/22/2025) yes Switch will be reloaded for disruptive upgrade. Do you want to continue with the installation (y/n)? [n] *y* Install is in progress, please wait. Performing runtime checks. [####################] 100% -- SUCCESS Setting boot variables. [####################] 100% -- SUCCESS Performing configuration copy. [####################] 100% -- SUCCESS Module 1: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. [####################] 100% -- SUCCESS [####################] 100% -- SUCCESS Finishing the upgrade, switch will reboot in 10 seconds. cs1# *install all nxos bootflash:nxos.10.6.3.F.bin* <---- 2nd pass updates EPLD image only Installer will perform compatibility check first. Please wait. Installer is forced disruptive Verifying image bootflash:/nxos.10.6.3.F.bin for boot variable "nxos". [####################] 100% -- SUCCESS Verifying EPLD/FPGA image //bootflash/nxos.10.6.3.F.bin. [####################] 100% -- SUCCESS Verifying image type. [####################] 100% -- SUCCESS Preparing "nxos" version info using image bootflash:/nxos.10.6.3.F.bin. [####################] 100% -- SUCCESS Preparing "bios" version info using image bootflash:/nxos.10.6.3.F.bin. [####################] 100% -- SUCCESS Performing module support checks. [####################] 100% -- SUCCESS Notifying services about system upgrade. [####################] 100% -- SUCCESS Compatibility check is done: Module bootable Impact Install-type Reason ------ -------- -------------- ------------ ------ 1 yes disruptive reset default upgrade is not hitless 27 yes disruptive none default upgrade is not hitless Images will be upgraded according to following table: Module Image Running-Version(pri:alt) New-Version Upg-Required -------- --------------------- ------------------------------------- ----------------- ------------ 27 nxos 10.4(2)(F) 10.6(3)(F) no 27 bios v05.53(01/22/2025):v05.47(04/28/2022) v05.53(01/22/2025) no FPGA microcode will be upgraded according to following table: Module Type EPLD Running-Version Flashed-Version* New-Version Upg-Required ------ ---- ----------------- --------------- ---------------- ----------- ------------ 27 SUP MI FPGA 0x5 0x5 0x5 No 27 SUP IO FPGA 0x17 0x17 0x18 Yes If Running-Version and Flashed-Version are different it implies that the system has not yet been reloaded for the new version to take effect. EPLD Upgrade may result in multiple modules going offline. Switch will be reloaded for disruptive upgrade. Do you want to continue with the installation (y/n)? [n] *y* Install is in progress, please wait. Setting boot variables. [####################] 100% -- SUCCESS Performing configuration copy. [####################] 100% -- SUCCESS Performing configuration copy. [####################] 100% -- SUCCESS Module 1: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. Module 1: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. [####################] 100% -- SUCCESS Module 27: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. Module 27: Refreshing compact flash and upgrading bios/loader/bootrom. Warning: please do not remove or power off the module at this time. [####################] 100% -- SUCCESS EPLD/FPGA upgrade can take up to 4 mins. Performing EPLD/FPGA upgrade. [####################] 100% -- SUCCESS Install has been successful.
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Verifica la nuova versione di NX-OS dopo il riavvio dello switch:
show versionEsempio
cs1# *show version* Cisco Nexus Operating System (NX-OS) Software TAC support: http://www.cisco.com/tac Copyright (C) 2002-2020, Cisco and/or its affiliates. All rights reserved. The copyrights to certain works contained in this software are owned by other third parties and used and distributed under their own licenses, such as open source. This software is provided "as is," and unless otherwise stated, there is no warranty, express or implied, including but not limited to warranties of merchantability and fitness for a particular purpose. Certain components of this software are licensed under the GNU General Public License (GPL) version 2.0 or GNU General Public License (GPL) version 3.0 or the GNU Lesser General Public License (LGPL) Version 2.1 or Lesser General Public License (LGPL) Version 2.0. A copy of each such license is available at http://www.opensource.org/licenses/gpl-2.0.php and http://opensource.org/licenses/gpl-3.0.html and http://www.opensource.org/licenses/lgpl-2.1.php and http://www.gnu.org/licenses/old-licenses/library.txt. Software BIOS: version 05.33 NXOS: version 10.6.3(f) BIOS compile time: 09/08/2018 NXOS image file is: bootflash:///nxos.10.6.3.F.bin NXOS compile time: 11/4/2018 21:00:00 [11/05/2018 06:11:06] Hardware cisco Nexus9000 C9332C-GX2B Chassis Intel(R) Xeon(R) CPU E5-2403 v2 @ 1.80GHz with 8154432 kB of memory. Processor Board ID FOC20291J6K Device name: cs1 bootflash: 53298520 kB Kernel uptime is 0 day(s), 0 hour(s), 3 minute(s), 42 second(s) Last reset at 277524 usecs after Mon Nov 2 22:45:12 2020 Reason: Reset due to upgrade System version: 9.3(4) Service: plugin Core Plugin, Ethernet Plugin Active Package(s):
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Dopo il riavvio dello switch, accedi nuovamente e verifica che la nuova versione di EPLD sia stata caricata correttamente:
show version module 1 epldEsempio
cs2# *show version module 1 epld* EPLD Device Version --------------------------------------- MI FPGA 0x7 IO FPGA 0x19 MI FPGA2 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2 GEM FPGA 0x2
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Se stai installando NX-OS come parte di una nuova installazione del sistema AFX, ripeti questi passaggi per installare le immagini NX-OS ed EPLD sullo switch cs2.
Dopo aver installato NX-OS sullo/sui tuoi switch, installi RCF iniziando con il "Installa o aggiorna la panoramica RCF".