Advanced EIGRP - Route Manipulation

3 important questions on Advanced EIGRP - Route Manipulation

EIGRP can filter routes that are received on or advertised out an interface. What can the routes be matched against?

  1. Access Control Lists (ACLs)
  2. IP Prefix Lists
  3. Route Maps
  4. Gateway IP Addresses

How is route filtering configured in EIGRP?

Classic Mode:
Router EIGRP as-number
Distribute List {acl |Prefix Prefix list |Route-Map Route Map | Gateway prefix-list }  {In | Out} {Interface-id}

Named Mode:
Router EIGRP name
Address Family IPv4 Unicast Autonomous-system as-number
Topology Base
Distribute List {acl |Prefix Prefix list |Route-Map Route Map | Gateway prefix-list }  {In | Out} {Interface-id}

In EIGRP, what is Offset List and what is it used for?

It is a feature to change the metric for specific routes received or advertised on an interface.
The Offset list command is used in conjunction with an ACL to specify which routes are to be changed and the offset-value is the value added to the metric.

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