Topology Table Information

TABLE 4 . 3 Topology Table Information
Status
Route—Adjacent Router’s
Address (Metrics) Number of Successors Feasible Distance
P 172.10.10.0/24 via 172.1.2.6
(3611648/3609600) via 172.5.6.6
(4121600/3609600) via 172.6.7.6
(5031234/3609600)
1 (RouterC) 3611648

The route with the best metric contains the lowest metric value and is chosen as the primary
route. If there is more than one route to a destination, the route with the second-lowest metric
will be chosen as the feasible successor, as long as the advertised distance of the potential feasible
successor is not greater than the feasible distance of the successor. Primary routes are
moved to the routing table after selection. More than one route can be made a primary route
in order to load-balance.
TABLE 4 . 3 Topology Table Information
Status
Route—Adjacent Router’s
Address (Metrics) Number of Successors Feasible Distance
P 172.10.10.0/24 via 172.1.2.6
(3611648/3609600) via 172.5.6.6
(4121600/3609600) via 172.6.7.6
(5031234/3609600)
1 (RouterC) 3611648
Enhanced Interior Gateway Routing Protocol 123
EIGRP uses the same metrics as IGRP (by default, bandwidth and delay). Those metrics are:
 Bandwidth
 Delay
 Reliability
 Load
Just as with IGRP, there is no specific calculation for the maximum transmission
unit (MTU) as a metric. The MTU, however, is used as a tiebreaker for
equal metric paths.
Bandwidth and delay are the two metrics used by default. The other metrics can be configured
manually. When you configure reliability, load, and MTU, this can cause the topology
table to be calculated more often.