Filtering by Referencing ACLs
To filter EIGRP routes by matching them using ACLs, the ACL must match a route with a permit clause to then allow the route to be advertised, and match the route with a deny clause to filter the route. Before getting into how an ACL matches a route, first it is important to review what can be examined based on the configuration of an IP ACL.
EIGRP distribute lists support the use of standard IP ACLs. The syntax of both numbered and named standard ACLs allows a configuration of one dotted-decimal number and its corresponding wildcard (WC) mask. When used for packet filtering, this number is compared to the source IP address of the packet. When referenced by the distribute-list command for the purpose of EIGRP route ...
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