An engineer is moving all of an organization's Cisco IOS XE BGP routers to the address-family identifier format. Which command should be used to perform this upgrade quickly with the minimum service disruption?
I've tested it in my lab and it indeed works:
(config)#router bgp 3351
(config-router)#bgp upgrade-cli
You are about to upgrade to the hierarchical AFI syntax of bgp commands
Are you sure? [yes]: yes
So, it's option B.
R1(config)#router bgp 61000
R1(config-router)#bgp upgrade-cli
You are about to upgrade to the hierarchical AFI syntax of bgp commands
Are you sure ? [yes]:
To upgrade a Network Layer Reachability Information (NLRI) formatted router configuration file to the address-family identifier (AFI) format and set the router command-line interface (CLI) to use only AFI commands, use the bgp upgrade-cli command in router configuration mode.
https://www.cisco.com/c/en/us/td/docs/ios/iproute_bgp/command/reference/irg_book/irg_bgp1.html#:~:text=or%20peer%20group.-,bgp%20upgrade%2Dcli,-To%20upgrade%20a
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