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CIS 185 CCNP ROUTE Ch. 4 Manipulating Routing Updates Part 1 - Route Redistribution

CIS 185 CCNP ROUTE Ch. 4 Manipulating Routing Updates Part 1 - Route Redistribution. Rick Graziani Cabrillo College graziani@cabrillo.edu Last Updated: Fall 2017. Objectives. Using multiple IP routing protocols Implementing route redistribution Controlling routing update traffic.

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CIS 185 CCNP ROUTE Ch. 4 Manipulating Routing Updates Part 1 - Route Redistribution

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  1. CIS 185 CCNP ROUTECh. 4 Manipulating Routing UpdatesPart 1 - Route Redistribution Rick Graziani Cabrillo College graziani@cabrillo.edu Last Updated: Fall 2017

  2. Objectives • Using multiple IP routing protocols • Implementing route redistribution • Controlling routing update traffic

  3. Multiple Routing Protocols on a Network

  4. Why Run Multiple Routing Protocols? • When migrating from an older Interior Gateway Protocol (IGP) to a new IGP. • In mixed-router vendor environments, such as EIGRP and OSPF. • When the use of a new protocol is desired, but the old routing protocol is still being implemented. • When some departments do not want to change support a new routing protocol.

  5. Selecting the Best Route in a Redistribution Environment 1 • Cisco routers use the following two parameters to select the best path: • Administrative distance: • Trustworthiness of the routing source • Modifying the administrative distance to influence the route-selection process is discussed later • When using route redistribution, you might occasionally need to modify a protocol’s administrative distance so that it is preferred and to prevent routing loops. (later) • Routing metric: • Best path

  6. Multiple Routing Protocols Solutions • Summarization • Redistribution between routing protocols • Route filtering

  7. Route Redistribution

  8. Routing protocols were not designed to interoperate with one another using different: • Metrics • Reactions to topology changes • Timers • Processes • Routers using different routing protocols can exchange routing information. • Route redistribution is the capability of boundary routers connecting different routing domains to exchange and advertise routing information between those routing domains.

  9. One-wayroute redistribution - one protocol receives the routes from another) • Two-way route redistribution - both protocols receive routes from each other. • Boundary routers: • Routers that perform redistribution • Borders two or more ASs or routing domains. • Note: The term boundary router is also sometimes used to describe a router running a classful routing protocol (like RIP) that has interfaces in more than one classful network.

  10. Redistribution is always performed outbound • The router doing redistribution does not change its routing table. • R1 (boundary router) participates in both: • OSPF • EIGRP • Two-way redistribution does not affect the routing table on R1 • However: • R2 will learn about redistributed EIGRP networks (via OSPF) • R3 will learn about redistributed OSPF networks (via EIGRP) • Only networks in R1’s routing table can be redistributed.

  11. My best path to 192.100.10.0 is this way. R2 and R3 are running both OSPF and EIGRP Configuring Redistribution 192.168.10.0 R3 R1 OSPF Routing Loop! EIGRP R2 My best path to 192.100.10.0 is this way. • Incompatible routing information • Each routing protocol uses different metrics. • EIGRP uses slowest BW and cumulative Delay • OSPF use cumulative BW • Metrics cannot be translated exactly into a different protocol • Path selection may not be optimal. • Potential Routing loops – Depending on how redistribution is used, routers can send routing information received from one AS back into the AS. (Route Feedback) • Inconsistent convergence times: • Different routing protocols converge at different rates. • These potential trouble spots can be avoided with careful planning and implementation.

  12. Concepts of Redistribution

  13. Multiple Routing Processes • Cisco routers support up to 30 dynamic routing processes on a single router. • Most routing protocols allow an administrator to configure multiple processes of the same routing algorithm • RIP and BGP are notable exceptions. Not usually recommended RTA#show running-config router ospf 24 network 10.2.0.0 0.0.255.255 area 0 ! router ospf 46 network 192.168.2.0 0.0.0.255 area 2 ! router eigrp 53 network 172.16.0.0 network 172.17.0.0 ! router eigrp 141 network 10.0.0.0 network 192.168.3.0 Not usually recommended

  14. Route redistribution - The process of exchanging routing information between routing protocols. • EIGRP routing domain learns about networks in OSPF routing domain. • OSPF routing domain learns about networks in EIGRP routing domain. • Done by a boundary router which participates in both routing protocols.

  15. Redistribution Concepts and Processes I run both EIGRP and OSPF. Router(config-router)# redistributefrom-protocol [process-id] Note: Other parameters may be required and will be discussed. • The redistribution command (“take routes from”) • Configured on the boundary router. • Participates in both routing protocols. • Independent of any one protocol • Various complexities depending on the routing protocols and the options.

  16. Redistributing from OSPF into EIGRP

  17. Our Topology OSPF 1 EIGRP 1 • Boundary router R2-E-O is running: • EIGRP for 172.30.0.0 subnets and 172.31.0.0 network • OSPF for 172.16.0.0 subnets and 172.17.0.0 network • 192.168.1.0 or 10.0.0.0 not currently included in either routing protocol (more on this later)

  18. Redistribution into EIGRP redistributeprotocol [process-id | as-number] [metricbw delay reliability load mtu ] [match {internal | nssa-external | external 1| external 2}] [tagtag-value] [route-map name] • The syntax differs slightly depending on the routing protocol into which routes will be redistributed.

  19. redistributeprotocol [process-id | as-number] [metricbw delay reliability load mtu ] [match {internal | nssa-external | external 1| external 2}] [tagtag-value] [route-map name] • protocol - The source of routing information. Includes RIP, OSPF, EIGRP, IS-IS, BGP, connected, and static. • process-id, as-number - If redistributing a routing protocol that uses a process-id or ASN on the router global config command, use this parameter to refer to that process or ASN value. • metric - A keyword after which follows the four metric components (bandwidth, delay, reliability, link load), plus the MTU associated with the route. • match - If redistributing from OSPF, this keyword lets you match internal OSPF routes, external (by type), and NSSA external routes, essentially filtering which routes are redistributed. • tag - Assigns a unitless integer value to the route, which can be later matched by other routers using a route-map. • route-map - Apply the logic in the referenced route-map to filter routes, set metrics, and set route tags.

  20. Current configurations R1-E router eigrp 1 network 172.30.0.0 network 172.31.0.0 auto-summary R2-E-O router eigrp 1 network 172.30.0.0 auto-summary router ospf 1 network 172.16.0.0 0.0.0.3 area 0 R3-O router ospf 1 network 172.16.0.0 0.0.255.255 area 0 R4-O router ospf 1 network 172.16.0.0 0.0.255.255 area 0 network 172.17.0.0 0.0.255.255 area 0

  21. What networks do I know about and how did I learn about them? What do you expect to see? Directly Connected and any EIGRP networks – NO OSPF networks R1-E# show ip route C 172.31.0.0/16 is directly connected, Loopback31 172.30.0.0/16 is variably subnetted, 6 subnets, 3 masks C 172.30.2.0/24 is directly connected, FastEthernet0/1 C 172.30.3.0/24 is directly connected, Loopback0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.0.0/16 is a summary, 00:02:41, Null0 C 172.30.1.0/24 is directly connected, FastEthernet0/0 C 172.30.4.0/24 is directly connected, Loopback1 R1-E#

  22. What do you expect to see? What networks do I know about and how did I learn about them? EIGRP and OSPF networks R2-E-O# show ip route O 172.17.0.0/16 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks O 172.16.0.4/30 [110/845] via 172.16.0.1, 00:02:32, Serial0/1 C 172.16.0.0/30 is directly connected, Serial0/1 O 172.16.1.0/24 [110/782] via 172.16.0.1, 00:02:32, Serial0/1 O 172.16.2.0/24 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 D 172.31.0.0/16 [90/20640000] via 172.30.0.1, 00:03:46, Serial0/0 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks D 172.30.2.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.3.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.1.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.4.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.0.0.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0 R2-E-O#

  23. What do you expect to see? What networks do I know about and how did I learn about them? Only OSPF networks – NO EIGRP networks R3-O# show ip route O 172.17.0.0/16 [110/65] via 172.16.0.6, 00:09:06, Serial0/2 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks C 172.16.0.4/30 is directly connected, Serial0/2 C 172.16.0.0/30 is directly connected, Serial0/1 C 172.16.1.0/24 is directly connected, FastEthernet0/0 O 172.16.2.0/24 [110/65] via 172.16.0.6, 00:09:06, Serial0/2 R3-O#

  24. What do you expect to see? What networks do I know about and how did I learn about them? Only OSPF networks – NO EIGRP networks R4-O# show ip route C 172.17.0.0/16 is directly connected, FastEthernet0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks C 172.16.0.4/30 is directly connected, Serial0/0 O 172.16.0.0/30 [110/128] via 172.16.0.5, 00:09:52, Serial0/0 O 172.16.1.0/24 [110/65] via 172.16.0.5, 00:09:52, Serial0/0 C 172.16.2.0/24 is directly connected, FastEthernet0/0 R4-0#

  25. Hey! I don’t see any of the networks in the OSPF domain! What happened? • No change for R1-E! • No OSPF networks • Let’s see what happened (or didn’t happen)… I will redistribute my OSPF learned networks (and OSPF network command networks) into EIGRP, telling my EIGRP neighbors about these networks R2-E-O(config)# router eigrp 1 R2-E-O(config-router)# redistribute ospf 1 R1-E# show ip route C 172.31.0.0/16 is directly connected, Loopback31 172.30.0.0/16 is variably subnetted, 6 subnets, 3 masks C 172.30.2.0/24 is directly connected, FastEthernet0/1 C 172.30.3.0/24 is directly connected, Loopback0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.0.0/16 is a summary, 00:02:41, Null0 C 172.30.1.0/24 is directly connected, FastEthernet0/0 C 172.30.4.0/24 is directly connected, Loopback1 R1-E#

  26. Should R2’s routing table change? No R2-E-O# show ip route O 172.17.0.0/16 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks O 172.16.0.4/30 [110/845] via 172.16.0.1, 00:02:32, Serial0/1 C 172.16.0.0/30 is directly connected, Serial0/1 O 172.16.1.0/24 [110/782] via 172.16.0.1, 00:02:32, Serial0/1 O 172.16.2.0/24 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 D 172.31.0.0/16 [90/20640000] via 172.30.0.1, 00:03:46, Serial0/0 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks D 172.30.2.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.3.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.1.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.4.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.0.0.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0 R2-E-O#

  27. BW/DLY BW redistribute protocol[process-id | as-number] [metricbw delay reliability load mtu ] default-metric bw delay reliability load mtu • When redistributing into EIGRP from another routing protocol you must convert the other routing protocol’s metric (OSPF’s cost, bandwidth) into EIGRP’s metric (BW, DLY, Reliability and Load). • This metric, referred to as the seed or default metric, is defined during redistribution configuration. • Three methods: • Metric parameter with redistribute command • Sets the default for all redistribute commands • Default-metric command • Sets the default for all redistribute commands • Route-map • Sets different metrics for routes learned from a single source

  28. 10000 100 255 1 OSPF 1 EIGRP 1 EIGRP 2 router eigrp 1 network 172.20.0.0 redistribute ospf 1 redistribute eigrp 2 default-metric 10000 100 255 1 1500 redistribute rip metric 50000 500 255 1 1500 50000 500 255 1 RIP • default-metriccommand is used where the metric parameter is not being applied in the redistribute command. • metric parameter takes precedence over the default-metriccommand • Note: The metric will give all redistributed networks the same starting metric. • This is known as the seed metric

  29. 1000 33 255 1 R2-E-O(config)# router eigrp 1 R2-E-O(config-router)# redistribute ospf 1 R2-E-O(config-router)# default-metric 1000 33 255 1 1500 BW DLY RLY Load MTU OR R2-E-O(config)# router eigrp 1 R2-E-O(config-router)# redistribute ospf 1 metric 1000 33 255 1 1500 BW DLY RLY Load MTU • Note: • MTU is NOT one of the EIGRP metrics (never has been, never will be) • MTU is included because it is tracked through the path to find the smallest MTU.

  30. Great! Now I see all the networks in the OSPF domain but as EIGRP routes. R1-E# show ip route D EX 172.17.0.0/16 [170/3080448] via 172.30.0.2, 00:01:50, Serial0/0 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks D EX 172.16.0.4/30 [170/3080448] via 172.30.0.2, 00:01:50, Serial0/0 D EX 172.16.0.0/30 [170/3080448] via 172.30.0.2, 00:01:50, Serial0/0 D EX 172.16.1.0/24 [170/3080448] via 172.30.0.2, 00:01:50, Serial0/0 D EX 172.16.2.0/24 [170/3080448] via 172.30.0.2, 00:01:50, Serial0/0 C 172.31.0.0/16 is directly connected, Loopback31 172.30.0.0/16 is variably subnetted, 6 subnets, 3 masks C 172.30.2.0/24 is directly connected, FastEthernet0/1 C 172.30.3.0/24 is directly connected, Loopback0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.0.0/16 is a summary, 00:12:08, Null0 C 172.30.1.0/24 is directly connected, FastEthernet0/0 C 172.30.4.0/24 is directly connected, Loopback1 • EX: External Route (redistributed) • 170: Administrative distance (90 for EIGRP internal routes) • R1-E has the same metric (3080448) for all external EIGRP networks (from the OSPF domain)

  31. R2-E-O# show ip eigrp top P 172.16.0.0/30, 1 successors, FD is 2568448 viaRedistributed (2568448/0) • R2 redistributed into EIGRP the routes learned via OSPF and its own directly connected network 172.16.0.0/30. • But not 192.168.1.0/24 and 10.0.0.0/8 • This is because 172.16.0.0/30 is an OSPF enabled interface (network statement) • Redistribute command, redistributes the following: • All routes in the routing table learned by that routing protocol • All connected routes of interfaces on which that routing protocol is enabled • Otherwise must be redistributed another way (connected or static) – coming

  32. What about the 10.0.0.0/24 network? How can I redistribute it into EIGRP? R2-E-O(config)# router ospf 1 R2-E-O(config-router)# network 10.0.0.0 0.0.0.255 area 0 R2-E-O# show ip route 10.0.0.0/24 is subnetted, 1 subnets C 10.0.0.0 is directly connected, FastEthernet0/1 No change to routing table • Two ways to redistribute 10.0.0.0/24 network. • Redistribute Connected • Add OSPF network command • Also propagates 10.0.0.0/24 throughout OSPF domain

  33. The 10.0.0.0 network is now included as one of my EIGRP routes. R1-E# show ip route D EX 10.0.0.0 [170/3080448] via 172.30.0.2, 00:01:33, Serial0/0 R4-0# show ip route O 10.0.0.0 [110/129] via 172.16.0.5, 00:04:02, Serial0/0 • 10.0.0.0 is now redistributed into the EIGRP domain with the rest of the OSPF networks.

  34. What about the 192.168.1.0 network? How can I redistribute it into EIGRP? R2-E-O(config)# router eigrp 1 R2-E-O(config-router)# redistribute connected metric 1000 33 255 1 1500 R1-E# show ip route 10.0.0.0/24 is subnetted, 1 subnets D EX 10.0.0.0 [170/3080448] via 172.30.0.2, 00:01:57, Serial0/0 D EX 192.168.1.0/24[170/3080448] via 172.30.0.2, 00:01:57, Serial0/0 R1-E# • 192.168.1.0/24 is redistributed into EIGRP as a connected network. • metric option is not required for this command (default 0, but beyond the scope of this pres.) • 192.168.1.0/24 is redistributed into the EIGRP domain using the default metric but it is NOT propagated throughout OSPF domain

  35. R2: Currently router eigrp 1 network 172.30.0.0 auto-summary redistribute ospf 1 default-metric 1000 33 255 1 1500 redistribute connected 1000 33 255 1 1500 ! router ospf 1 network 10.0.0.0 0.0.0.255 area 0 network 172.16.0.0 0.0.0.3 area 0

  36. Redistributing from EIGRP into OSPF

  37. BW/DLY BW redistributeprotocol [process-id | as-number] [metric {metric-value | transparent}] [metric-type type-value] [match {internal | external 1| external 2 | nssa-external}][tagtag-value] [route-map map-tag] [subnets] • Several similarities and differences to redistributing into EIGRP. • In this case we must convert the EIGRP metric to the Cisco OSPF metric of Bandwidth.

  38. redistributeprotocol [process-id | as-number] [metric {metric-value | transparent}] [metric-type type-value] [match {internal | external 1| external 2 | nssa-external}][tagtag-value] [route-map map-tag] [subnets] • Metric - Defines the cost metric assigned to the route in the Type 5 (or Type 7 if NSSA) LSA. metric transparent when taking from another OSPF process, pass through the metric with the route. • metric-type {1 | 2} - Defines the external metric type of 1 (E1 routes) or 2 (E2 routes). • Match - If redistributing from OSPF, this keyword lets you match internal OSPF routes, external (by type), and NSSA external routes, essentially filtering which routes are redistributed. • Tag - Assigns a unitless integer value to the route, which can be later matched by other routers using a route-map. • route-map - Apply the logic in the referenced route-map to filter routes, set metrics, and set route tags. • Subnets - Redistribute subnets of classful networks. Without this parameter, only routes for classful networks are redistributed. (This behavior is particular to the OSPF redistribute command.)

  39. BW/DLY BW=20 BW=20 redistributeprotocol [process-id | as-number] [metric {metric-value | transparent}] [metric-type type-value] [match {internal | external 1| external 2 | nssa-external}][tagtag-value] [route-map map-tag] [subnets] • Defaults when redistributing into OSPF: • When redistributing networks from all other sources the default metric is 20. • External metric type 2 (metric does not change throughout OSPF routing domain) • Only redistributes routes of classful (Class A, B, and C) networks, and not for subnets

  40. R2: Currently router eigrp 1 network 172.30.0.0 auto-summary redistribute ospf 1 default-metric 1000 33 255 1 1500 redistribute connected 1000 33 255 1 1500 ! router ospf 1 network 10.0.0.0 0.0.0.255 area 0 network 172.16.0.0 0.0.0.3 area 0 • Where we left off…

  41. What do you expect to see? EIGRP and OSPF networks What networks do I know about and how did I learn about them? R2-E-O# show ip route O 172.17.0.0/16 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks O 172.16.0.4/30 [110/845] via 172.16.0.1, 00:02:32, Serial0/1 C 172.16.0.0/30 is directly connected, Serial0/1 O 172.16.1.0/24 [110/782] via 172.16.0.1, 00:02:32, Serial0/1 O 172.16.2.0/24 [110/846] via 172.16.0.1, 00:02:32, Serial0/1 D 172.31.0.0/16 [90/20640000] via 172.30.0.1, 00:03:46, Serial0/0 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks D 172.30.2.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.3.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.1.0/24 [90/20514560] via 172.30.0.1, 01:22:36, Serial0/0 D 172.30.4.0/24 [90/20640000] via 172.30.0.1, 01:22:36, Serial0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.0.0.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0

  42. R2-E-O# show ip ospf data OSPF Router with ID (192.168.1.1) (Process ID 1) Router Link States (Area 0) Link ID ADV Router Age Seq# Checksum Link count 172.16.1.1 172.16.1.1 85 0x80000005 0x006220 5 172.30.0.6 172.30.0.6 2000 0x80000006 0x006BB4 4 192.168.1.1 192.168.1.1 1117 0x80000003 0x009742 3 R2-E-O# • No External Type 5 LSAs • No EIGRP networks being redistributed into OSPF

  43. R2-E-O(config)# router ospf 1 R2-E-O(config-router)# redistribute eigrp 1 % Only classful networks will be redistributed R2-E-O(config-router)# R2-E-O# show ip ospf data <Router Link States omitted> Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 172.31.0.0 192.168.1.1 9 0x80000001 0x0094D4 0 R2-E-O# • By default, only classful networks will be redistributed from EIGRP into OSPF. • Subnets will not be redistributed • Supernets will also be redistributed (such as 173.0.0.0/8)

  44. Remember, routes are only Redistributed if they are in the Routing table R2-E-O# show ip route O 172.17.0.0/16 [110/846] via 172.16.0.1, 00:03:56, Serial0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks O 172.16.0.4/30 [110/845] via 172.16.0.1, 00:03:56, Serial0/1 C 172.16.0.0/30 is directly connected, Serial0/1 O 172.16.1.0/24 [110/782] via 172.16.0.1, 00:03:56, Serial0/1 O 172.16.2.0/24 [110/846] via 172.16.0.1, 00:03:56, Serial0/1 D 172.31.0.0/16 [90/20640000] via 172.30.0.1, 00:18:29, Serial0/0 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks D 172.30.2.0/24 [90/20514560] via 172.30.0.1, 01:37:19, Serial0/0 D 172.30.3.0/24 [90/20640000] via 172.30.0.1, 01:37:19, Serial0/0 C 172.30.0.0/30 is directly connected, Serial0/0 D 172.30.1.0/24 [90/20514560] via 172.30.0.1, 01:37:19, Serial0/0 D 172.30.4.0/24 [90/20640000] via 172.30.0.1, 01:37:19, Serial0/0 10.0.0.0/24 is subnetted, 1 subnets C 10.0.0.0 is directly connected, FastEthernet0/1 C 192.168.1.0/24 is directly connected, FastEthernet0/0

  45. I only see the class B 172.31.0.0/16 network in the EIGRP domain. R3-O# show ip route O 172.17.0.0/16 [110/65] via 172.16.0.6, 00:01:16, Serial0/2 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks C 172.16.0.4/30 is directly connected, Serial0/2 C 172.16.0.0/30 is directly connected, Serial0/1 C 172.16.1.0/24 is directly connected, FastEthernet0/0 O 172.16.2.0/24 [110/65] via 172.16.0.6, 00:01:16, Serial0/2 O E2 172.31.0.0/16 [110/20] via 172.16.0.2, 00:01:16, Serial0/1 10.0.0.0/24 is subnetted, 1 subnets O 10.0.0.0 [110/65] via 172.16.0.2, 00:01:17, Serial0/1 R3-O# • Only the class B network 172.31.0.0/16 is redistributed into OSPF

  46. R3-O# show ip ospf data <Router Link States omitted> Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 172.31.0.0 192.168.1.1 88 0x80000001 0x0094D4 0 R3-O# • External Type 5 LSA

  47. I will add the subnets option. R2-E-O(config)# router ospf 1 R2-E-O(config-router)# redistribute eigrp 1 subnets No warning message “Only classful networks will be redistributed” • Subnets – Subnets are now included in the redistribution.

  48. R2-E-O# show ip ospf data Type-5 AS External Link States Link ID ADV Router Age Seq# Checksum Tag 172.30.0.0 192.168.1.1 79 0x80000001 0x008EDE 0 172.30.1.0 192.168.1.1 79 0x80000001 0x0095D3 0 172.30.2.0 192.168.1.1 79 0x80000001 0x008ADD 0 172.30.3.0 192.168.1.1 79 0x80000001 0x007FE7 0 172.30.4.0 192.168.1.1 79 0x80000001 0x0074F1 0 172.31.0.0 192.168.1.1 220 0x80000001 0x0094D4 0 R2-E-O# • R2 now includes Type 5 LSAs for subnets

  49. R3-O# show ip route O 172.17.0.0/16 [110/65] via 172.16.0.6, 00:13:41, Serial0/2 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks C 172.16.0.4/30 is directly connected, Serial0/2 C 172.16.0.0/30 is directly connected, Serial0/1 C 172.16.1.0/24 is directly connected, FastEthernet0/0 O 172.16.2.0/24 [110/65] via 172.16.0.6, 00:13:41, Serial0/2 O E2 172.31.0.0/16 [110/20] via 172.16.0.2, 00:13:41, Serial0/1 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks O E2 172.30.2.0/24 [110/20] via 172.16.0.2, 00:00:12, Serial0/1 O E2 172.30.3.0/24 [110/20] via 172.16.0.2, 00:00:12, Serial0/1 O E2 172.30.0.0/30 [110/20] via 172.16.0.2, 00:00:12, Serial0/1 O E2 172.30.1.0/24 [110/20] via 172.16.0.2, 00:00:14, Serial0/1 O E2 172.30.4.0/24 [110/20] via 172.16.0.2, 00:00:14, Serial0/1 10.0.0.0/24 is subnetted, 1 subnets O 10.0.0.0 [110/65] via 172.16.0.2, 00:00:14, Serial0/1 BW=20 Now I see all networks and subnets from the EIGRP domain. External OSPF routes are E2 with a default cost of 20. metric-type E2 - The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route.

  50. BW=20 BW=20 R4-0# show ip route C 172.17.0.0/16 is directly connected, FastEthernet0/1 172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks C 172.16.0.4/30 is directly connected, Serial0/0 O 172.16.0.0/30 [110/128] via 172.16.0.5, 00:04:02, Serial0/0 O 172.16.1.0/24 [110/65] via 172.16.0.5, 00:04:02, Serial0/0 C 172.16.2.0/24 is directly connected, FastEthernet0/0 O E2 172.31.0.0/16 [110/20] via 172.16.0.5, 00:04:02, Serial0/0 172.30.0.0/16 is variably subnetted, 5 subnets, 2 masks O E2 172.30.2.0/24 [110/20] via 172.16.0.5, 00:01:46, Serial0/0 O E2 172.30.3.0/24 [110/20] via 172.16.0.5, 00:01:46, Serial0/0 O E2 172.30.0.0/30 [110/20] via 172.16.0.5, 00:01:46, Serial0/0 O E2 172.30.1.0/24 [110/20] via 172.16.0.5, 00:01:46, Serial0/0 O E2 172.30.4.0/24 [110/20] via 172.16.0.5, 00:01:46, Serial0/0 10.0.0.0/24 is subnetted, 1 subnets O 10.0.0.0 [110/129] via 172.16.0.5, 00:04:04, Serial0/0 External OSPF routes are E2 with a default cost of 20. metric-type 2 - The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route.

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