EIGRP Named-Mode

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EIGRP Has 2 modes
        1. EIGRP Classic Mode //we use Autonomous number to run
        2. EIGRP Named Mode //we use any Name to run

EIGRP Named Mode has multiple Features:
        *It support 64 bit metric Calculation
        *It measure Delay in Pico Second
        *It has multiple sub address family to work
      *Work for interface no need to go in global mode, under Router EIGRP named mode we can do interface based changes related to EIGRP
        *Authentication also we can also apply under router EIGRP process
        *EIGRP Named Mode support Fast re-route feature
        *Under EIGRP Named mode we need to define Autonomous number

So let’s do some practical and we will also see what commands we run in Classic mode and what we have in named mode for the same

Run EIGRP & Inject Few interfaces

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
Network 10.0.0.0	address-family ipv4 autonomous-system 10
Network 192.168.0.0 255.255.0.0	network 10.0.0.0
Exit	network 192.168.0.0 255.255.0.0
.	exit

Change Timers of EIGRP on interface F2/0

Classic Mode	Named Mode
interface fastEthernet 2/0	router eigrp CCIE
ip hello-interval eigrp 10 5	address-family ipv4 autonomous-system 10
ip hold-time eigrp 10 15	af-interface fastEthernet 2/0
Exit	hello-interval 5
.	hold-time 15
.	Exit

MD5 Authentication on interface F2/0

Classic Mode	Named Mode
key chain CCIE	key chain CCIE
key 1	key 1
key-string CCIE	key-string CCIE
Exit	Exit
interface fastEthernet 2/0	router eigrp CCIE
ip authentication mode eigrp 10 md5	address-family ipv4 autonomous-system 10
ip authentication key-chain eigrp 10 CCIE	af-interface fastEthernet 2/0
Exit	authentication mode md5
.	authentication key-chain CCIE
.	Hmac-SHA Authentication on interface F2/0

Hmac-SHA Authentication on interface F2/0

Classic Mode	Named Mode
does not support	router eigrp CCIE
.	address-family ipv4 autonomous-system 10
.	af-interface fastEthernet 2/0
.	authentication mode hmac-sha-256 CCIE
.	exit

Passive interface feature

Classic Mode	Named Mode
router eigrp 10	router eigrp CCIE
passive-interface fastEthernet 2/0	address-family ipv4 autonomous-system 10
Exit	af-interface fastEthernet 2/0
.	passive-interface
.	no split-horizon
.	Exit

Split-Horizon Feature

Classic Mode	Named Mode
interface fastEthernet 2/0	router eigrp CCIE
no ip split-horizon eigrp 10	address-family ipv4 autonomous-system 10
Exit	af-interface fastEthernet 2/0
.	no split-horizon
.	Exit

Stub Feature

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
Network 10.0.0.0	address-family ipv4 autonomous-system 10
Network 192.168.0.0 255.255.0.0	eigrp stub
Exit	Exit

Change AD values for internal routes and external routes

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
distance eigrp 90 170	address-family ipv4 autonomous-system 10
Exit	topology base
.	distance eigrp 90 170
.	Exit

Filtering of prefixes using Distribute-List

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
distribute-list route-map new in fastEthernet 2/0	address-family ipv4 autonomous-system 10
Exit	topology base
.	distribute-list route-map new in fastEthernet 2/0
.	Exit

Change Maximum Path for best routes

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
maximum-paths 4	topology base
Exit	address-family ipv4 autonomous-system 10
.	topology base
.	maximum-paths 4
.	Exit

Control from how many hops you want to receive the update

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
metric maximum-hops 10	address-family ipv4 autonomous-system 10
Exit	topology base
.	metric maximum-hops 10
.	Exit

Equal cost load-Balancing feature

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
offset-list 1 in 3680 f2/0	address-family ipv4 autonomous-system 10
Exit	topology base
.	offset-list 1 in 3680 f2/0
.	Exit

Unequal-Cost Load-Balancing Feature

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
variance 2	address-family ipv4 autonomous-system 10
Exit	topology base
.	variance 2
.	Exit

Redistribution Process

Classic Mode	Named Mode
Router eigrp 10	router eigrp CCIE
redistribute ospf 1 metric 1000 1 255 1 1500	address-family ipv4 autonomous-system 10
Exit	topology base
.	redistribute ospf 1 metric 1000 1 255 1 1500
.	Exit

EIGRP Named Mode has a best Feature Fast Re-route

Using this feature router install best and backup path in CEF directly and when best path goes down it never take time to shift the traffic to other backup link, without this feature whenever primary link goes down router run DUAL to make the route best and then it start using new path and this make some delay in traffic forwarding.
EIGRP Classic Mode does not support this feature.

So let’s see how we can use Fast Re-route feature

So here is the output of CEF before using Fast Re-route feature

Now we will enable this feature for all the routes
        *router eigrp CCIE
        *address-family ipv4 autonomous-system 12
        *topology base
        *fast-reroute per-prefix all
        *exit

here is the output after enabling fast-reroute feature. And we can see the attached next-hop also, in case of primary link fails it will shift traffic instantly to repaired next-hop

We can also control this behavior , as of now we are enabling for all the prefixes if we want to control this behavior we can use a route-map for selected prefixes instead of using all keyword in fast-reroute command

               Check out our Complete EIGRP Video on Youtube