An engineer is performing an ISSU upgrade on the Cisco MDS 9000 Series Switch. What is the impact on the control plane of the switch?
An engineer is performing an ISSU upgrade on the Cisco MDS 9000 Series Switch. What is the impact on the control plane of the switch?
When performing an ISSU (In-Service Software Upgrade) on the Cisco MDS 9000 Series Switch, the control plane is disrupted but only for a brief period. Specifically, the control plane will be down for less than 80 seconds. This brief downtime allows the switch to load the new firmware onto the standby supervisor, perform a switchover, and bring the new firmware into operation with minimal interruption. The data plane continues to operate during this period, ensuring no disruption to existing data traffic.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/6_2/upgrade/guides/nx-os/upgrade.html "Nondisruptive upgrades on these fabric switches disrupts the control plane for not more than 80 seconds. The software upgrade might be disruptive if the upgrade progresses beyond when it can be stopped gracefully or if a failure occurs."
A is correct
A is correct Nondisruptive upgrades on these fabric switches disrupts the control plane for not more than 80 seconds. The software upgrade might be disruptive if the upgrade progresses beyond when it can be stopped gracefully or if a failure occurs. Note During the upgrade the control plane is down, but the data plane remains up. New devices are not able to log in to the fabric through the control plane, but existing devices do not experience any disruption of traffic through the data plane https://community.cisco.com/t5/storage-networking/how-can-issu-be-nondisruptive-for-mds-9148-or-9396/td-p/3354960#:~:text=Nondisruptive%20upgrades%20on%20these%20fabric,the%20data%20plane%20remains%20up.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/upgrade/guide/b_Cisco_Nexus_9000_Series_NX-OS_Software_Upgrade_and_Downgrade_Guide_Release_7x/b_Cisco_Nexus_9000_Series_NX-OS_Software_Upgrade_and_Downgrade_Guide_Release_7x_chapter_010.html "The data plane traffic is not disrupted during the ISSU process. In other words, the data plane forwards the packets while the control plane is being upgraded, any servers that are connected to the Cisco Nexus 9000 and 3100 Series switches do not see any traffic disruption. The control plane downtime during the ISSU process is approximately less than 120 seconds."
i will go with C, single supervisor MDS 9000 will reload...i dont think cisco will commit on any time though.
Dataplane is unaffected, but the control plane needs to perform a switchover for dual SUPs and will need to reboot for single SUPs. https://www.cisco.com/c/en/us/support/docs/storage-networking/mds-9000-nx-os-san-os-software/118952-technote-mds9k-00.html