- Configuration Example 1: Redistributing Classful Routes into OSPF with the Default Type and Metric
- Configuration Example 2: Redistributing Classful Routes into OSPF with the Default Type and Specific Metric
- Configuration Example 3: Redistributing Classful Routes into OSPF as Type 1 Routes Using a Specific Metric
- Configuration Example 4: Redistributing Subnet Routes into OSPF as Type 1 Routes Using a Specific Metric
- Configuration Example 5: Redistributing Subnet Routes into OSPF as Type 1 Routes Using a Specific Metric and Route Tag
- Configuration Example 6: Controlling the Routes to Be Redistributed Based on IP Address
- Configuration Example 7: Modifying the Metric of Redistributed Routes Using a Route Map
- Configuration Example 8: Modifying the Metric Type of Redistributed Routes Using a Route Map
- Configuration Example 9: Modifying the Tag Value of Redistributed Routes Using a Route Map
- Configuration Example 10: Controlling Route Redistribution Based on Tag Values
- Troubleshooting
This chapter is from the book
This chapter is from the book
This chapter is from the book
Configuration Example 3: Redistributing Classful Routes into OSPF as Type 1 Routes Using a Specific Metric
Routes are redistributed in OSPF as either type 1 (E1) routes or type 2 (E2) routes, with type 2 being the default. A type 1 route has a metric that is the sum of the internal OSPF cost and the external redistributed cost. A type 2 route has a metric equal only to the redistributed cost, as shown in Figure 14-2. If routes are redistributed into OSPF as type 2 then every router in the OSPF domain will see the same cost to reach the external networks. If routes are redistributed into OSPF as type 1, then the cost to reach the external networks could vary from router to router.
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Figure 14-2 OSPF Routes Are Redistributed as Either Type 1 or Type 2
Routes
Modify the configuration on Router B so that the EIGRP routes are redistributed as type 1 routes.
Router B router ospf 1 redistribute eigrp 1 metric 66 metric-type 1
Verification
Verify that the EIGRP routes have been redistributed into OSPF as type 1 routes with a metric of 66.
rtrB#show ip ospf database external
OSPF Router with ID (2.2.2.2) (Process ID 1)
Type-5 AS External Link States
LS age: 149
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 5.0.0.0 (External Network Number )
Advertising Router: 2.2.2.2
LS Seq Number: 80000008
Checksum: 0xA638
Length: 36
Network Mask: /8
Metric Type: 1 (Comparable directly to link state metric)
TOS: 0
Metric: 66
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 158
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 145.5.0.0 (External Network Number )
Advertising Router: 2.2.2.2
LS Seq Number: 80000008
Checksum: 0x4706
Length: 36
Network Mask: /16
Metric Type: 1 (Comparable directly to link state metric)
TOS: 0
Metric: 66
Forward Address: 0.0.0.0
External Route Tag: 0
LS age: 168
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 205.5.5.0 (External Network Number )
Advertising Router: 2.2.2.2
LS Seq Number: 80000008
Checksum: 0x10B
Length: 36
Network Mask: /24
Metric Type: 1 (Comparable directly to link state metric)
TOS: 0
Metric: 66
Forward Address: 0.0.0.0
External Route Tag: 0
Verify that the cost of these routes as seen by Router A is the sum of the redistributed metric and the OSPF cost to reach Router B.
rtrA#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
O E1 205.5.5.0/24 [110/1628] via 10.1.1.2, 00:05:36, Serial0/1
O E1 5.0.0.0/8 [110/1628] via 10.1.1.2, 00:05:36, Serial0/1
O E1 145.5.0.0/16 [110/1628] via 10.1.1.2, 00:05:36, Serial0/1
10.0.0.0/30 is subnetted, 1 subnets
C 10.1.1.0 is directly connected, Serial0/1