EIGRP Named Mode

General information on “EIGRP Named Mode”:

• Traditional method is called the “classic mode”
• Problem of classic mode: Some things are configured globally, some things are configured per interface and the configuration syntax under the interface is fragmented (unlike in OSPF where everything begins with “ip ospf”)
• Named EIGRP “fixes” this problem by configuring everything globally und a single EIGRP instance with subgroups
• Another advantage is that a single IPv4 AS and a single IPv6 AS can be configured under the same EIGRP instance (with different AS numbers)
• Routers within the same AS can use both versions (classic and named) and form adjacencies
• When using named mode, EIGRP automatically uses wide metrics (optimization for links greater than 1G)
• When configuring an IPv6 AS, EIGRP is automatically enabled on all IPv6-configured interfaces

Configuration considerations:

• An existing EIGRP classic mode configuration can be converted/upgraded to EIGRP named mode
• All configuration done under af-interface default subgroup will be inherited by all interfaces

“EIGRP Named Mode” CLI configuration commands:

## Converting EIGRP classic mode to EIGRP named mode
Router(config)# router eigrp <asn>
Router(config-router)# eigrp upgrade-cli [NAME]

## Configuring an EIGRP named mode process
Router(config)# router eigrp [NAME]
Router(config-router)# address-family [ipv4 | ipv6] autonomous-system <asn>