r6#sh ip route 22.214.171.124
Routing entry for 126.96.36.199/16
Known via “ospf 100”, distance 110, metric 20, type extern 2, forward metric 1
Last update from 188.8.131.52 on FastEthernet0/0, 00:29:54 ago
Routing Descriptor Blocks:
* 184.108.40.206, from 220.127.116.11, 00:29:54 ago, via FastEthernet0/0
Route metric is 20, traffic share count is 1
If we change the above route from an OSPF E2 to an OSPF E1 route, what will the route metric be?
Highlight for answer: 21. E1 routes compute the OSPF metric “end-to-end”, whereas E2 routes only compute the OSPF metric from the ASBR onwards. In the output above the ‘forward metric’ represents the metric to reach the ASBR. When the route is converted to an E1, the forward cost is added to the existing metric to form the E1 metric.