Enhanced Interior Gateway Protocol (EIGRP) is a Cisco
proprietary distance vector routing protocol. It is based on
the Diffusing Update Algorithm (DUAL), which is a method of
finding loop-free paths through a network. Directly
connected routers running EIGRP form neighbor adjacencies in
order to propagate best-path and alternate-path routing
information for configured and learned routes.
The tables defined within the MIB are closely aligned with how
the router command-line interface for EIGRP displays
information on EIGRP configurations, i.e., the topology table
contains objects associated with the EIGRP topology commands,
and the peer table contains objects associated withe EIGRP
neighbor commands, etc.
There are five main tables within this mib:
EIGRP VPN table
Contains information regarding which virtual private
networks (VPN) are configured with EIGRP.
EIGRP traffic statistics table
Contains counter & statistcs regarding specific types of
EIGRP packets sent and related collective information
per VPN and per autonomous system (AS).
EIGRP topology table
Contains information regarding EIGRP routes received in
updates and originated locally. EIGRP sends and
receives routing updates from adjacent routers running
EIGRP with which it formed a peer relationship.
EIGRP peer (neighbor) table
Contains information about neighbor EIGRP routers with
which peer adjacencies have been established. EIGRP
uses a Hello protocol to form neighbor relationships
with directly connected routers also running EIGRP.
EIGRP interfaces table
Contains information and statistics on each of the
configured to run.
The Wide-Metrics feature calculates all metrics in 64-bit
under named mode EIGRP. Since the RIB can only hold 32-bit,
we divide the wide metrics by RIB-scale (range 1-255,
default value 128) to convert it to a 32-bit value
before assiging it to RIB metrics.