CCNP Route Lab 5-1 , Configure and Verify Path Control
Topology
Objectives
- Configure and verify policy-based routing.
- Select the required tools and commands to configure policy-based routing operations.
- Verify the configuration and operation by using the proper show and debug commands.
Background
You want to experiment with policy-based routing (PBR) to see how it is implemented and to study how it could be of value to your organization. To this end, you have interconnected and configured a test network with four routers. All routers are exchanging routing information using EIGRP.
Note: This lab uses Cisco 1841 routers with Cisco IOS Release 12.4(24)T1, and the Advanced IP Services image c1841 -advipservicesk9-mz.124-24.T1 .bin. You can use other routers (such as 2801 or 2811) and Cisco IOS Software versions if they have comparable capabilities and features. Depending on the router and software version, the commands available and output produced might vary from what is shown in this lab.
Required Resources
- 4 routers (Cisco 1841 with Cisco IOS Release 12.4(24)T1 Advanced IP Services or comparable)
- Serial and console cables
Step 1: Prepare the routers for the lab.
Cable the network as shown in the topology diagram. Erase the startup configuration, and reload each router to clear previous configurations.
Step 2: Configure router hostname and interface addresses.
a. Using the addressing scheme in the diagram, create the loopback interfaces and apply IP addresses to these and the serial interfaces on R1, R2, R3, and R4. On the serial interfaces connecting R1 to R3 and R3 to R4, specify the bandwidth as 64 Kb/s and set a clock rate on the DCE using the clock rate 64000 command. On the serial interfaces connecting R1 to R2 and R2 to R3, specify the bandwidth as 128 Kb/s and set a clock rate on the DCE using the clock rate 128000 command.
You can copy and paste the following configurations into your routers to begin.
Note: Depending on the router model, interfaces might be numbered differently than those listed. You might need to alter them accordingly.
Router R1
hostname R1 ! interface Lo1 description R1 LAN ip address 192.168.1.1 255.255.255.0 ! interface Serial0/0/0 description R1 --> R2 ip address 172.16.12.1 255.255.255.248 clock rate 128000 bandwidth 128 no shutdown ! interface Serial0/0/1 description R1 --> R3 ip address 172.16.13.1 255.255.255.248 bandwidth 64 no shutdown ! end
Router R2
hostname R2 ! interface Lo2 description R2 LAN ip address 192.168.2.1 255.255.255.0 ! interface Serial0/0/0 description R2 --> R1 ip address 172.16.12.2 255.255.255.248 bandwidth 128 no shutdown interface Serial0/0/1 description R2 --> R3 ip address 172.16.23.2 255.255.255.248 clock rate 128000 bandwidth 128 no shutdown ! end
Router R3
hostname R3 ! interface Lo3 description R3 LAN ip address 192.168.3.1 255.255.255.0 ! interface Serial0/0/0 description R3 --> R1 ip address 172.16.13.3 255.255.255.248 clock rate 64000 bandwidth 64 no shutdown ! interface Serial0/0/1 description R3 --> R2 ip address 172.16.23.3 255.255.255.248 bandwidth 128 no shutdown ! interface Serial0/1/0 description R3 --> R4 ip address 172.16.34.3 255.255.255.248 clock rate 64000 bandwidth 64 no shutdown ! end
Router R4
hostname R4 ! interface Lo4 description R4 LAN A ip address 192.168.4.1 255.255.255.128 ! interface Lo5 description R4 LAN B ip address 192.168.4.129 255.255.255.128 ! interface Serial0/0/0 description R4 --> R3 ip address 172.16.34.4 255.255.255.248 bandwidth 64 no shutdown ! end
b. Verify the configuration with the show ip interface brief, show protocols, and show interfaces description commands. The output from router R3 is shown here as an example.
R3# show ip interface brief Interface IP-Address OK? Method Status Protocol FastEthernet0/0 unassigned YES manual administratively down down FastEthernet0/1 unassigned YES unset administratively down down Serial0/0/0 172.16.13.3 YES manual up up Serial0/0/1 172.16.23.3 YES manual up up Serial0/1/0 172.16.34.3 YES manual up up Serial0/1/1 unassigned YES unset administratively down down Loopback3 192.168.3.1 YES manual up up R3# show protocols Global values: Internet Protocol routing is enabled FastEthernet0/0 is administratively down, line protocol is down FastEthernet0/1 is administratively down, line protocol is down Serial0/0/0 is up, line protocol is up Internet address is 172.16.13.3/29 Serial0/0/1 is up, line protocol is up Internet address is 172.16.23.3/29 Serial0/1/0 is up, line protocol is up Internet address is 172.16.34.3/29 Serial0/1/1 is administratively down, line protocol is down Loopback3 is up, line protocol is up Internet address is 192.168.3.1/24 R3# show interfaces description Interface Status Protocol Description Fa0/0 admin down down Fa0/1 admin down down Se0/0/0 up up R3 --> R1 Se0/0/1 up up R3 --> R2 Se0/1/0 up up R3 --> R4 Se0/1/1 admin down down Lo3 up up R3 LAN
Step 3: Configure basic EIGRP.
a. Implement EIGRP AS 1 over the serial and loopback interfaces as you have configured it for the other EIGRP labs.
b. Advertise networks 172.16.12.0/29, 172.16.13.0/29, 172.16.23.0/29, 172.16.34.0/29, 192.168.1.0/24, 192.168.2.0/24, 192.168.3.0/24, and 192.168.4.0/24 from their respective routers.
You can copy and paste the following configurations into your routers.
Router R1
router eigrp 1 network 192.168.1.0 network 172.16.12.0 0.0.0.7 network 172.16.13.0 0.0.0.7 no auto-summary
Router R2
router eigrp 1 network 192.168.2.0 network 172.16.12.0 0.0.0.7 network 172.16.23.0 0.0.0.7 no auto-summary
Router R3
router eigrp 1 network 192.168.3.0 network 172.16.13.0 0.0.0.7 network 172.16.23.0 0.0.0.7 network 172.16.34.0 0.0.0.7 no auto-summary
Router R4
router eigrp 1 network 192.168.4.0 network 172.16.34.0 0.0.0.7 no auto-summary
You should see EIGRP neighbor relationship messages being generated.
Step 4: Verify EIGRP connectivity.
a. Verify the configuration by using the show ip eigrp neighbors command to check which routers have EIGRP adjacencies.
R1# show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 172.16.13.3 Se0/0/1 12 00:00:58 127 2280 0 16 0 172.16.12.2 Se0/0/0 13 00:01:20 8 1140 0 17 R2# show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 1 172.16.23.3 Se0/0/1 10 00:01:30 15 1140 0 17 0 172.16.12.1 Se0/0/0 11 00:01:43 14 1140 0 180 R3# show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 2 172.16.34.4 Se0/1/0 10 00:02:51 27 2280 0 3 0 172.16.13.1 Se0/0/0 12 00:03:08 45 2280 0 19 1 172.16.23.2 Se0/0/1 12 00:03:13 12 1140 0 16 R4# show ip eigrp neighbors IP-EIGRP neighbors for process 1 H Address Interface Hold Uptime SRTT RTO Q Seq (sec) (ms) Cnt Num 0 172.16.34.3 Se0/0/0 13 00:03:33 40 2280 0 15
Did you receive the output you expected?
The output should be similar to that shown above.
b. Run the following Tcl script on all routers to verify full connectivity.
R1# tclsh
foreach address {
172.16.12.1
172.16.12.2
172.16.13.1
172.16.13.3
172.16.23.2
172.16.23.3
172.16. 34.3
172.16. 34. 4
192.168.1.1
192.168. 2.1
192.168. 3.1
192.168. 4.1
192.168. 4.129
} { ping $address }
You should get ICMP echo replies for every address pinged. Make sure to run the Tcl script on each router.
Step 5: Verify the current path.
Before you configure PBR, verify the routing table on R1.
a. On R1, use the show ip route command. Notice the next-hop IP address for all networks discovered by EIGRP.
R1# show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 172.16.0.0/29 is subnetted, 4 subnets D 172.16.34.0 [90/41024000] via 172.16.13.3, 00:05:18, Serial0/0/1 D 172.16.23.0 [90/21024000] via 172.16.12.2, 00:05:18, Serial0/0/0 C 172.16.12. 0 is directly connected, Serial0/0/0 C 172.16.13.0 is directly connected, Serial0/0/1 192.168.4.0/25 is subnetted, 2 subnets D 192.168.4.0 [90/41152000] via 172.16.13.3, 00:05:06, Serial0/0/1 D 192.168.4.128 [90/41152000] via 172.16. 13.3, 00:05:06, Serial0/0/1 C 192.168.1.0/24 is directly connected, Loopback1 D 192.168.2.0/24 [90/20640000] via 172.16.12.2, 00:05:18, Serial0/0/0 D 192.168.3.0/24 [90/21152000] via 172.16.12.2, 00:05:18, Serial0/0/0
b. On R4, use the traceroute command to the R1 LAN address and source the ICMP packet from R4 LAN A and LAN B.
Note: You can specify the source as the interface address (for example 192.168.4.1) or the interface designator (for example, Fa0/0).
R4# traceroute 192.168.1.1 source 192.168.4.1 Type escape sequence to abort. Tracing the route to 192.168.1.1 1 172.16.34.3 12 msec 12 msec 16 msec 2 172.16.23.2 20 msec 20 msec 20 msec 3 172.16.12.1 28 msec 24 msec * R4# traceroute 192.168.1.1 source 192.168.4.129 Type escape sequence to abort. Tracing the route to 192.168.1.1 1 172.16.34.3 12 msec 12 msec 16 msec 2 172.16.23.2 20 msec 20 msec 20 msec 3 172.16.12.1 28 msec 24 msec *
Notice that the path taken for the packets sourced from the R4 LANs are going through R3 –> R2 –> R1.
Why are the R4 interfaces not using the R3 –> R1 path?
Because the serial interfaces between routers R1 and R3 have been configured with a lower bandwidth of 64 Kb/s, giving it a higher metric. All other serial interfaces are using the bandwidth setting of 128 Kb/s. R3 chooses to send all packets to R2 because of its lower metric.
c. On R3, use the show ip route command and note that the preferred route from R3 to R1 LAN 192.168.1.0/24 is via R2 using the R3 exit interface S0/0/1.
R3# show ip route Codes: C - connected, S - static, 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 i - IS-IS, su - IS-IS summary, 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 172.16.0.0/29 is subnetted, 4 subnets C 172.16.34.0 is directly connected, Serial0/1/0 C 172.16.23.0 is directly connected, Serial0/0/1 D 172.16.12.0 [90/21024000] via 172.16.23.2, 00:15:07, Serial0/0/1 C 172.16.13.0 is directly connected, Serial0/0/0 192.168.4.0/25 is subnetted, 2 subnets D 192.168.4.0 [90/40640000] via 172.16.34.4, 00:14:55, Serial0/1/0 D 192.168.4.128 [90/40640000] via 172.16.34.4, 00:14:55, Serial0/1/0 D 192.168.1.0/24 [90/21152000] via 172.16.23.2, 00:15:07, Serial0/0/1 D 192.168.2.0/24 [90/20640000] via 172.16.23.2, 00:15:07, Serial0/0/1 C 192.168.3.0/24 is directly connected, Loopback3
d. On R3, use the show interfaces serial 0/0/0 and show interfaces s0/0/1 commands.
R3# show interfaces s0/0/0 Serial0/0/0 is up, line protocol is up Hardware is GT96K Serial Description: R3 --> R1 Internet address is 172.16.13.3/29 MTU 1500 bytes, BW 64 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) CRC checking enabled Last input 00:00:00, output 00:00:00, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/1/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 48 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 771 packets input, 53728 bytes, 0 no buffer Received 489 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 768 packets output, 54404 bytes, 0 underruns 0 output errors, 0 collisions, 6 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out 1 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up R3# show interfaces s0/0/1 Serial0/0/1 is up, line protocol is up Hardware is GT96K Serial Description: R3 --> R2 Internet address is 172.16.23.3/29 MTU 1500 bytes, BW 128 Kbit/sec, DLY 20000 usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) CRC checking enabled Last input 00:00:00, output 00:00:01, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: weighted fair Output queue: 0/1000/64/0 (size/max total/threshold/drops) Conversations 0/1/256 (active/max active/max total) Reserved Conversations 0/0 (allocated/max allocated) Available Bandwidth 1158 kilobits/sec 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 894 packets input, 65653 bytes, 0 no buffer Received 488 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 895 packets output, 66785 bytes, 0 underruns 0 output errors, 0 collisions, 6 interface resets 0 unknown protocol drops 0 output buffer failures, 0 output buffers swapped out 1 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up
Notice that the bandwidth of the serial link between R3 and R1 (S0/0/0) is set to 64 Kb/s, while the bandwidth of the serial link between R3 and R2 (S0/0/1) is set to 128 Kb/s.
e. Confirm that R3 has a valid route to reach R1 from its serial 0/0/0 interface using the show ip eigrp topology 192.168.1.0 command.
R3# show ip eigrp topology 192.168.1.0 IP-EIGRP (AS 1): Topology entry for 192.168.1.0/24 State is Passive, Query origin flag is 1, 1 Successor(s), FD is 21152000 Routing Descriptor Blocks: 172.16.23.2 (Serial0/0/1), from 172.16.23.2, Send flag is 0x0 Composite metric is (21152000/20640000), Route is Internal Vector metric: Minimum bandwidth is 128 Kbit Total delay is 45000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 2 172.16.13.1 (Serial0/0/0), from 172.16.13.1, Send flag is 0x0 Composite metric is (40640000/128256), Route is Internal Vector metric: Minimum bandwidth is 64 Kbit Total delay is 25000 microseconds Reliability is 255/255 Load is 1/255 Minimum MTU is 1500 Hop count is 1
As indicated, R4 has two routes to reach 192.168.1.0. However, the metric for the route to R1 (172.16.13.1) is much higher (40640000) than the metric of the route to R2 (21152000), making the route through R2 the successor route.
Step 6: Configure PBR to provide path control.
Now you will deploy source-based IP routing by using PBR. You will change a default IP routing decision based on the EIGRP-acquired routing information for selected IP source-to-destination flows and apply a different next-hop router.
Recall that routers normally forward packets to destination addresses based on information in their routing table. By using PBR, you can implement policies that selectively cause packets to take different paths based on source address, protocol type, or application type. Therefore, PBR overrides the router’s normal routing behavior.
Configuring PBR involves configuring a route map with match and set commands and then applying the route map to the interface.
The steps required to implement path control include the following:
- Choose the path control tool to use. Path control tools manipulate or bypass the IP routing table. For PBR, route-map commands are used.
- Implement the traffic-matching configuration, specifying which traffic will be manipulated. The match commands are used within route maps.
- Define the action for the matched traffic using set commands within route maps.
- Apply the route map to incoming traffic.
As a test, you will configure the following policy on router R3:
- All traffic sourced from R4 LAN A must take the R3 –> R2 –> R1 path.
- All traffic sourced from R4 LAN B must take the R3 –> R1 path.
a. On router R3, create a standard access list called PBR-ACL to identify the R4 LAN B network.
R3(config)# ip access-list standard PBR-ACL R3(config-std-nacl)# remark ACL matches R4 LAN B traffic R3(config-std-nacl)# permit 192.168.4.128 0.0.0.127 R3(config-std-nacl)# exit
b. Create a route map called R3-to-R1 that matches PBR-ACL and sets the next-hop interface to the R1 serial 0/0/1 interface.
R3(config)# route-map R3-to-R1 permit R3(config-route-map)# match ip address PBR-ACL R3(config-route-map)# set ip next-hop 172.16.13.1 R3(config-route-map)# exit
c. Apply the R3-to-R1 route map to the serial interface on R3 that receives the traffic from R4. Use the ip
policy route-map command on interface S0/1/0.
R3(config)# interface s0/1/0 R3(config-if)# ip policy route-map R3-to-R1 R3(config-if)# end
d. On R3, display the policy and matches using the show route-map command.
R3# show route-map route-map R3-to-R1, permit, sequence 10 Match clauses: ip address (access-lists): PBR-ACL Set clauses: ip next-hop 172.16.13.1 Policy routing matches: 0 packets, 0 bytes
Note: There are currently no matches because no packets matching the ACL have passed through R3 S0/1/0.
Step 7: Test the policy.
Now you are ready to test the policy configured on R3. Enable the debug ip policy command on R3 so that you can observe the policy decision-making in action. To help filter the traffic, first create a standard ACL that identifies all traffic from the R4 LANs.
a. On R3, create a standard ACL which identifies all of the R4 LANs.
R3# conf t Enter configuration commands, one per line. End with CNTL/Z. R3(config)# access-list 1 permit 192.168.4.0 0.0.0.255 R3(config)# exit
b. Enable PBR debugging only for traffic that matches the R4 LANs.
R3# debug ip policy ? <1-199> Access list dynamic dynamic PBR <cr> R3# debug ip policy 1 Policy routing debugging is on for access list 1
c. Test the policy from R4 with the traceroute command, using R4 LAN A as the source network.
R4# traceroute 192.168.1.1 source 192.168.4.1 Type escape sequence to abort. Tracing the route to 192.168.1.1 1 172.16.34.3 0 msec 0 msec 4 msec 2 172.16.23.2 0 msec 0 msec 4 msec 3 172.16.12.1 4 msec 0 msec *
Notice the path taken for the packet sourced from R4 LAN A is still going through R3 –> R2 –> R1.
As the traceroute was being executed, router R3 should be generating the following debug output.
R3# *Feb 23 06:59:20.931: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, policy rejected -- normal forwarding *Feb 23 06:59:29.935: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, policy rejected -- normal forwarding *Feb 23 06:59:29.939: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, policy rejected -- normal forwarding *Feb 23 06:59:29.939: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding *Feb 23 06:59:38.943: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding *Feb 23 06:59:38.947: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding *Feb 23 06:59:38.947: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding *Feb 23 06:59:47.951: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding *Feb 23 06:59:47.955: IP: s=192.168.4.1 (Serial0/1/0), d=192.168.1.1, len 28, FIB policy rejected(no match) - normal forwarding
Why is the traceroute traffic not using the R3 –> R1 path as specified in the R3-to-R1 policy?
It does not take the PBR-specified path because LAN A does not meet the criteria specified in the PBRACL access list.
d. Test the policy from R4 with the traceroute command, using R4 LAN B as the source network.
R4# traceroute 192.168.1.1 source 192.168.4.129 Type escape sequence to abort. Tracing the route to 192.168.1.1 1 172.16.34.3 12 msec 12 msec 16 msec 2 172.16.13.1 28 msec 28 msec *
Now the path taken for the packet sourced from R4 LAN B is R3 –> R1, as expected.
The debug output on R3 also confirms that the traffic meets the criteria of the R3-to-R1 policy.
R3# *Feb 23 07:07:46.467: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, policy match *Feb 23 07:07:46.467: IP: route map R3-to-R1, item 10, permit *Feb 23 07:07:46.467: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1 (Se rial0/0/0), len 28, policy routed *Feb 23 07:07:46.467: IP: Serial0/1/0 to Serial0/0/0 172.16.13.1 *Feb 23 07:07:55.471: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, policy match *Feb 23 07:07:55.471: IP: route map R3-to-R1, item 10, permit *Feb 23 07:07:55.471: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1 (Se rial0/0/0), len 28, policy routed *Feb 23 07:07:55.471: IP: Serial0/1/0 to Serial0/0/0 172.16.13.1 *Feb 23 07:07:55.471: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, policy match *Feb 23 07:07:55.471: IP: route map R3-to-R1, item 10, permit *Feb 23 07:07:55.475: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1 (Se rial0/0/0), len 28, policy routed *Feb 23 07:07:55.475: IP: Serial0/1/0 to Serial0/0/0 172.16.13.1 *Feb 23 07:07:55.475: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, FIB policy match *Feb 23 07:07:55.475: IP: s=192. 168.4.129 (Serial0/1/0), d=192.168.1.1, g= 172.16.13.1, len 28, FIB policy routed *Feb 23 07:08:04.483: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, FIB policy match *Feb 23 07:08:04.483: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, g= 172.16.13.1, len 28, FIB policy routed *Feb 23 07:08:04.491: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, le n 28, FIB policy match *Feb 23 07:08:04.491: IP: s=192.168.4.129 (Serial0/1/0), d=192.168.1.1, g= 172.16.13.1, len 28, FIB policy routed
e. On R3, display the policy and matches using the show route-map command.
R3# show route-map route-map R3-to-R1, permit, sequence 10 Match clauses: ip address (access-lists): PBR-ACL Set clauses: ip next-hop 172.16.13.1 Policy routing matches: 12 packets, 384 bytes
Note: There are now matches to the policy because packets matching the ACL have passed through R3 S0/1/0.
Router Interface Summary Table
| Router Interface Summary | ||||
| Router Model | Ethernet Interface #1 |
Ethernet Interface #2 |
Serial Interface #1 |
Serial Interface #2 |
| 1700 | Fast Ethernet 0 (Fa0) |
Fast Ethernet 1 (Fa1) |
Serial 0 (S0) | Serial 0/0/1 (S0/0/1) |
| 1800 | Fast Ethernet 0/0 (Fa0/0) |
Fast Ethernet 0/1 (Fa0/1) |
Serial 0/0/0 (S0/0/0) |
Serial 0/0/1 (S0/0/1) |
| 2600 | Fast Ethernet 0/0 (Fa0/0) |
Fast Ethernet 0/1 (Fa0/1) |
Serial 0/0 (S0/0) | Serial 0/1 (S0/1) |
| 2800 | Fast Ethernet 0/0 (Fa0/0) |
Fast Ethernet 0/1 (Fa0/1) |
Serial 0/0/0 (S0/0/0) |
Serial 0/0/1 (S0/0/1) |
| Note: To find out how the router is configured, look at the interfaces to identify the type of router and how many interfaces the router has. Rather than list all combinations of configurations for each router class, this table includes identifiers for the possible combinations of Ethernet and serial interfaces in the device. The table does not include any other type of interface, even though a specific router might contain one. For example, for an ISDN BRI interface, the string in parenthesis is the legal abbreviation that can be used in Cisco IOS commands to represent the interface. | ||||
Device Configurations (Instructor version)
Router R1
hostname R1 ! interface Lo1 description R1 LAN ip address 192.168.1.1 255.255.255.0 ! interface Serial0/0/0 description R1 --> R2 ip address 172.16.12.1 255.255.255.248 clock rate 128000 bandwidth 128 no shutdown !i nterface Serial0/0/1 description R1 --> R3 ip address 172.16.13.1 255.255.255.248 bandwidth 64 no shutdown ! router eigrp 1 network 192.168.1.0 network 172.16.12.0 0.0.0.7 network 172.16.13.0 0.0.0.7 no auto-summary ! end
Router R2
hostname R2 !i nterface Lo2 description R2 LAN ip address 192.168.2.1 255.255.255.0 ! interface Serial0/0/0 description R2 --> R1 ip address 172.16.12.2 255.255.255.248 bandwidth 128 no shutdown interface Serial0/0/1 description R2 --> R3 ip address 172.16.23.2 255.255.255.248 clock rate 128000 bandwidth 128 no shutdown ! router eigrp 1 network 192.168.2.0 network 172.16.12.0 0.0.0.7 network 172.16.23.0 0.0.0.7 no auto-summary ! end
Router R3
hostname R3 ! interface Lo3 description R3 LAN ip address 192.168.3.1 255.255.255.0 ! interface Serial0/0/0 description R3 --> R1 ip address 172.16.13.3 255.255.255.248 clock rate 64000 bandwidth 64 no shutdown ! interface Serial0/0/1 description R3 --> R2 ip address 172.16.23.3 255.255.255.248 bandwidth 128 no shutdown ! interface Serial0/1/0 description R3 --> R4 ip address 172.16.34.3 255.255.255.248 ip policy route-map R3-to-R1 clock rate 64000 bandwidth 64 no shutdown ! router eigrp 1 network 192.168.3.0 network 172.16.13.0 0.0.0.7 network 172.16.23.0 0.0.0.7 network 172.16.34.0 0.0.0.7 no auto-summary ! ip access-list standard PBR-ACL remark ACL matches R4 LAN B traffic permit 192.168.4.128 0.0.0.127 ! access-list 1 permit 192.168.4.0 0.0.0.255 ! route-map R3-to-R1 permit 10 match ip address PBR-ACL set ip next-hop 172.16.13.1 ! end
Router R4
hostname R4 ! interface Lo4 description R4 LAN A ip address 192.168.4.1 255.255.255.128 ! interface Lo5 description R4 LAN B ip address 192.168.4.129 255.255.255.128 ! interface Serial0/0/0 description R4 --> R3 ip address 172.16.34.4 255.255.255.248 bandwidth 64 no shutdown ! router eigrp 1 network 192.168.4.0 network 172.16.34.0 0.0.0.7 no auto-summary ! end
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