EIGRP - EIGRP Configuration Modes

8 important questions on EIGRP - EIGRP Configuration Modes

What are the major differences between EIGRP Classic Configuration Mode and Named Mode?

In Classic Configuration Mode most configuration is done under the EIGRP process and some is done on interface configuration level.

In Named mode a EIGRP process is configured, then an EIGRP Instance is configured. Under the instance settings are configured either directly like the Network command or under the Interface and Topology submodes.

How is the EIGRP Router ID configured?

Either dynamically, which is default and chooses highest UP loopback ip address and if not present highest UP interface ip addres.
Otherwise statically with the command: eigrp router-id 32bit number
Command is the same for both Classic Configuration and Named mode.

EIGRP has two possible Metric sets, which is used when?

EIGRP Classic metrics are used in EIGRP Classic Configuration
EIGRP Wide metrics are used in EIGRP Named Mode
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In EIGRP Timers do not have to match, but what is important about this when forming adjacencies?

The Hello must be received before the hold time reaches zero.

What are the 5 steps top configure EIGRP Authentication?

  1. Create keychain using command: Key Chain keychainname
  2. Identify key number: Key key-number
  3. Specify PSK: Key-String password
  4. Configure keychain on interface:
    IP Authentication Key-Chain EIGRP as-number keychainname
  5. Configure authentication mode on interface:
    IP Authentication Mode EIGRP as-number MD5

EIGRP Wide metrics are backwards compatible with EIGRP Classic metrics. What needs to be the case for adjacency to form between two routers using the different metrics?

The K values need to be configured the same and for Wide metrisc the K6 value mustn't be set.

What is the default maximum routes for EIGRP ECMP? And how can this be changed?

Default is 4 routes.
Can be changed using command: Maximum-paths number
Under EIGRP process in classic mode and under topology base submode in named mode.

When does a router sends a Stuck in Active query? And when does it declare the neighbor Stuck in Active?

When is sends a query to a neighbor but doesn't get a response it waits half the Active timer (90 seconds of 180 seconds) and then sends a Stuck in Active query.
If it doesn't respond within another 90 seconds the Active timer expires and the neighbor is deemed Stuck in Active and all routes for that neighbor are removed.

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