Information Technology Reference
In-Depth Information
Task 11: Configure Additional OSPF Features
Use the auto-cost reference-bandwidth command to adjust the reference bandwidth
value.
Step 1.
Increase the reference bandwidth to 10000 to simulate 10GigE speeds. Configure this
command on all routers in the OSPF routing domain.
R1(config-router)# auto-cost reference-bandwidth 10000
% OSPF: Reference bandwidth is changed.
Please ensure reference bandwidth is consistent across all routers.
R2(config-router)# auto-cost reference-bandwidth 10000
% OSPF: Reference bandwidth is changed.
Please ensure reference bandwidth is consistent across all routers.
R3(config-router)# auto-cost reference-bandwidth 10000
% OSPF: Reference bandwidth is changed.
Please ensure reference bandwidth is consistent across all routers.
Examine the routing table on the R1 router to verify the change in the OSPF cost metric.
Step 2.
Notice that the values are much larger cost values for OSPF routes:
R1# show ip route
<output omitted>
Gateway of last resort is 0.0.0.0 to network 0.0.0.0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.1.1.1/32 is directly connected, Loopback0
O 10.10.10.0/24 [110/39943] via 192.168.10.6, 00:01:01, Serial0/0/1
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.1.16/28 is directly connected, FastEthernet0/0
O 172.16.1.32/29 [110/39162] via 192.168.10.6, 00:00:51, Serial0/0/1
172.30.0.0/30 is subnetted, 1 subnets
C 172.30.1.0 is directly connected, Loopback1
192.168.10.0/30 is subnetted, 3 subnets
C 192.168.10.0 is directly connected, Serial0/0/0
C 192.168.10.4 is directly connected, Serial0/0/1
O 192.168.10.8 [110/39843] via 192.168.10.6, 00:01:01, Serial0/0/1
S* 0.0.0.0/0 is directly connected, Loopback1
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