QuestionQ516

Layer 3 Technologies

Question Image

Refer to the exhibit. An engineer must redistribute networks 192.168.10.0/24 and 192.168.20.0/24 from EIGRP into OSPF, with a metric that is added across multiple hops, starting an external route at 20. The engineer observes that the external metric remains fixed and does not increase at each hop. Which configuration resolves this issue?

  • A R2(config)#access-list 10 permit 192.168.10.0 0.0.0.255 R2(config)#access-list 10 permit 192.168.20.0 0.0.0.255 ! R2(config)#route-map RD permit 10 R2(config-route-map)#match ip address 10 R2(config-route-map)#set metric 20 R2(config-route-map)#set metric-type type-2 ! R2(config)#router ospf 10 R2(confjg-router)#redistribute eigrp 10 subnets route-map RD
  • B R2(config)#access-list 10 permit 192.168.10.0 0.0.0.255 R2(config)#access-list 10 permit 192.168.20.0 0.0.0.255 ! R2(config)#route-map RD permit 10 R2(config-route-map)#match ip address 10 R2(config-route-map)#set metric 20 R2(config-route-map)#set metric-type type-1 ! R2(config)#router ospf 10 R2(config-router)#redistribute eigrp 10 subnets route-map RD
  • C R1(config)#access-list 10 permit 192.168.10.0 0.0.0.255 R1(config)#access-list 10 permit 192.168.20.0 0.0.0.255 ! R1(config)#route-map RD permit 10 R1(config-route-map)#match ip address 10 R1(config-route-map)#set metric 20 R1(config-route-map)#set metric-type type-1 ! R1(config)#router ospf 10 R1(config-router)#redistribute eigrp 10 subnets route-map RD
  • D R1(config)#access-list 10 permit 192.168.10.0 0.0.0.255 R1(config)#access-list 10 permit 192.168.20.0 0.0.0.255 ! R1(config)#route-map RD permit 10 R1(config-route-map)#match ip address 10 R1(config-route-map)#set metric 20 R1(config-route-map)#set metric-type type-2 ! R1(config)#router ospf 10 R1(config-router)#redistribute eigrp 10 subnets route-map RD
Explanation

An OSPF external Type 1 (E1) route adds its external seed metric to the internal OSPF cost of reaching the ASBR, so a seed metric of 20 increases as the route is reached through additional OSPF hops. Redistribution must occur on R2, the router connecting EIGRP 10 to OSPF 10. External Type 2 (E2) would retain only the fixed external metric.

Learn more

Community Discussion

No comments yet. Be the first to start the discussion!