Configuration Guide: EIGRP Classic to Named Mode Conversion

From: EIGRP Classic to Named Mode Conversion

• The EIGRP Classic to Named Mode Conversion feature allows you to upgrade Enhanced Interior Gateway Routing Protocol (EIGRP) classic mode configurations to named mode configurations without causing network flaps or requiring the EIGRP process to restart. This feature supports both IPv4 and IPv6.
• You must use the eigrp upgrade-cli command to convert EIGRP configurations from classic mode to named mode. If multiple classic mode configurations exist, you must use this command per EIGRP autonomous system number in classic mode.
• The eigrp upgrade-cli command blocks the router from accepting any other command until the conversion is complete (the console is locked). The time taken to complete the conversion depends on the size of the configuration. However, the conversion is a one-time activity.
• The eigrp upgrade-cli command is available only under EIGRP classic router configuration mode. Therefore, you can convert configurations from classic mode to named mode but not vice-versa.
• After conversion, the running configuration on the device will show only named mode configurations; you will be unable to see any classic mode configurations. To revert to classic mode configurations, you can reload the router without saving the running configuration to the startup configuration.
• After conversion, the copy startup-config running-config command will fail because you cannot have both the classic and named mode for the same autonomous system.
• After conversion, all neighbors (under the converted router EIGRP) will undergo graceful restart and sync all routes.
• The Enhanced Interior Gateway Routing Protocol (EIGRP) can be configured using either the classic mode or the named mode. The classic mode is the old way of configuring EIGRP. In classic mode, EIGRP configurations are scattered across the router mode and the interface mode. The named mode is the new way of configuring EIGRP; this mode allows EIGRP configurations to be entered in a hierarchical manner under the router mode.
• Each named mode configuration can have multiple address families and autonomous system number combinations. In the named mode, you can have similar configurations across IPv4 and IPv6. We recommend that you upgrade to EIGRP named mode because all new features, such as Wide Metrics, IPv6 VRF Lite, and EIGRP Route Tag Enhancements, are available only in EIGRP named mode.
• Use the eigrp upgrade-cli command to upgrade from classic mode to named mode.
• If multiple classic configurations exist, you must use this command per autonomous system number. You must use this command separately for IPv4 and IPv6 configurations.
• With this feature, you can move an entire classic mode configuration to a router named mode configuration, and consequently, all configurations under interfaces will be moved to the address-family interface under the appropriate address family and autonomous-system number. 
• After conversion, the show running-config command will show only named mode configurations; you will not see any old classic mode configurations.

R1(config)#router eigrp 100
R1(config-router)#eigrp upgrade-cli ?
  WORD  EIGRP Virtual-Instance Name

R1(config-router)#eigrp upgrade-cli LAB
Configuration will be converted from router eigrp 100 to router eigrp LAB.
Are you sure you want to proceed? ? [yes/no]: yes
R1(config)#
EIGRP: Conversion of router eigrp 100 to router eigrp LAB - Completed.