What is E2 route in OSPF?
OSPF External Routes (E2) are advertised into OSPF Autonomous System with a particular cost and the cost is not changed throughout the AS. The routes are learned via redistribution of other routing protocol or static route or a connected subnet. By default, all OSPF routes learned via redistribution are of E2 type.
What does this E2 mean in the routing table?
E2 or External Type2 Routes – If 2 external type 2 routes exist with the same metric to the same destination the route with the lowest metric to the ASBR will is used.
What are OSPF E1 and E2 routes?
Routes will be advertised as E1 routes. E2 routes have a default fixed cost of 20 associated with them, but this value can be changed with the metric keyword. The metric will not change as the route is propagated throughout the OSPF area. E1 routes will have internal area costs added to the seed metric.
IS-IS routing protocol administrative distance?
By default, OSPF has a default administrative distance of 110 and RIP has a default administrative distance of 120. Administrative distance values can, however, usually be adjusted manually by a network administrator….Cisco.
| Routing protocol | Administrative distance |
|---|---|
| Internal EIGRP | 90 |
| IGRP | 100 |
| OSPF | 110 |
| IS-IS | 115 |
How does OSPF choose best path?
If there are multiple routes to a network with the same route type, the OSPF metric calculated as cost based on the bandwidth is used for selecting the best route. The route with the lowest value for cost is chosen as the best route.
What is the administrative distance of external OSPF routes?
110
By default, OSPF has a default administrative distance of 110 and RIP has a default administrative distance of 120. Administrative distance values can, however, usually be adjusted manually by a network administrator.
How external routes are advertised generally E1 or E2 )? How do you change from E2 to E1?
E2 routes have a default fixed cost of 20 associated with them, but this value can be changed with the metric keyword. The metric will not change as the route is propagated throughout the OSPF area. E1 routes will have internal area costs added to the seed metric.