問題文
Before upgrading one node of a pair, an engineer wants the traffic to leave that node in a controlled way, without editing the routing policy and without waiting for a real failure. Which action achieves that, and what does the pair report while the action is in force?
選択肢
- Delete the definition of the peer on that node, so that the groups above the default one lose their peer and become ineligible, and put the definition back after the upgrade has finished.
- Put that node into the software upgrade mode, which suspends the exchange with the peer so that the groups stay active on both nodes and the traffic is shared between them while the upgrade runs, with no group above the default one marked ineligible and no failure code raised anywhere.
- Shut down the interfaces that carry the transit traffic of that node, which the pair reports with the code for a failure in the hardware, so the node is taken out of service as a whole and the peer becomes the owner of each group while it is ineligible.
- Put that node into the software upgrade mode, which introduces a device failure carrying the code for a software upgrade, so every group above the default one becomes ineligible there and its traffic moves to the peer.