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Problem Description
A U-Country E customer upgrades an OSN3500 network element from version R9C03 to version V2R11C00, and the service is interrupted for 20 minutes during the upgrade process. The service resumed after all the boards were upgraded to version R11.
Warning MessageNone
ProcessingBefore upgrading, configure static Arp on the network element, and then perform the upgrade operation.
Root CauseBecause the network elements were using dynamic ARP before the upgrade, when the master control of this network element has been upgraded to version R11C00 and the single board is still in version R9C03, the network element cannot respond to the ARP request message when the ARP table entries of the opposite end are aging and the ARP request message is sent. At this time, ARP protocol messages could not be interoperated, ARP table entries were aged, and the service was interrupted. The service is resumed until all the boards are upgraded to R11C00 version.
Recommendations and SummaryFor packet service, the master control and the single board version must be the same, otherwise it may lead to the service failure of the whole network element. When the master is R9C03 version and the single board is R11C00 version, it will also lead to service failure.
After configuring static ARP, the packet service will have millisecond damage due to the loss of static ARP during the upgrade process.
After configuring static ARP, the packet service will have millisecond damage due to the loss of static ARP during the upgrade process.
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