6.7.11 Lab – Configure Cisco IOS Resilience Management and Reporting Answers

Lab – Configure Cisco IOS Resilience Management and Reporting (Answers Version)

Answers Note: Red font color or gray highlights indicate text that appears in the instructor copy only.

Topology

Addressing Table

Blank Line, No additional information

Objectives

Part 1: Configure Basic Device Settings

Part 2: Configure SNMPv3 Security using an ACL.

Part 3: Configure a router as a synchronized time source for other devices using NTP.

Part 4: Configure syslog support on a router.

Background / Scenario

The router is a critical component in any network. It controls the movement of data into and out of the network and between devices within the network. It is particularly important to protect network routers because the failure of a routing device could make sections of the network, or the entire network, inaccessible. Controlling access to routers and enabling reporting on routers is critical to network security and should be part of a comprehensive security policy.

In this lab, you will build a multi–router network and configure the routers and hosts. You will configure SNMP, NTP, and syslog support to monitor router configuration changes.

Note: The routers used with hands-on labs are Cisco 4221 with Cisco IOS XE Release 16.9.6 (universalk9 image). The switches used in the labs are Cisco Catalyst 2960+ with Cisco IOS Release 15.2(7) (lanbasek9 image). Other routers, switches, and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and the output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of the lab for the correct interface identifiers.

Note: Before you begin, ensure that the routers and the switches have been erased and have no startup configurations.

Required Resources

3 Routers (Cisco 4221 with Cisco XE Release 16.9.6 universal image or comparable with a Security Technology Package license)

2 Switches (Cisco 2960+ with Cisco IOS Release 15.2(7) lanbasek9 image or comparable)

2 PCs (Windows OS with a terminal emulation program, such as PuTTY or Tera Term installed)

Console cables to configure Cisco networking devices

Ethernet cables as shown in the topology

Instructions

Part 1:Configure Basic Device Settings

In this part, set up the network topology and configure basic settings, such as interface IP addresses.

Step 1:Cable the network.

Attach the devices, as shown in the topology diagram, and cable as necessary.

Step 2:Configure basic settings for each router.

Open configuration window

1. Console into the router and enable privileged EXEC mode.

Router> enable

Router# configure terminal

2. Configure host names as shown in the topology.

R1(config)# hostname R1

3. Configure interface IP addresses as shown in the IP Addressing Table.

R1(config)# interface g0/0/0

R1(config-if)# ip address 10.1.1.1 255.255.255.0

R1(config-if)# no shutdown

R1(config)# interface g0/0/1

R1(config-if)# ip address 192.168.1.1 255.255.255.0

R1(config-if)# no shutdown

4. To prevent the router from attempting to translate incorrectly entered commands as though they were host names, disable DNS lookup. R1 is shown here as an example.

R1(config)# no ip domain-lookup

Step 3:Configure OSPF routing on the routers.

1. Use the router ospf command in global configuration mode to enable OSPF on R1.

R1(config)# router ospf 1

2. Configure the network statements for the networks on R1. Use an area ID of 0.

R1(config-router)# network 192.168.1.0 0.0.0.255 area 0

R1(config-router)# network 10.1.1.0 0.0.0.3 area 0

3. Configure OSPF on R2 and R3.

R2(config)# router ospf 1

R2(config-router)# network 10.1.1.0 0.0.0.3 area 0

R2(config-router)# network 10.2.2.0 0.0.0.3 area 0

R3(config)# router ospf 1

R3(config-router)# network 10.2.2.0 0.0.0.3 area 0

R3(config-router)# network 192.168.3.0 0.0.0.255 area 0

4. Issue the passive-interface command to change the G0/0/1 interface on R1 and R3 to passive.

R1(config)# router ospf 1

R1(config-router)# passive-interface g0/0/1

R3(config)# router ospf 1

R3(config-router)# passive-interface g0/0/1

Step 4:Verify OSPF neighbors and routing information.

1. Issue the show ip ospf neighbor command to verify that each router lists the other routers in the network as neighbors.

R1# show ip ospf neighbor

Neighbor IDPriStateDead TimeAddressInterface

10.2.2.21FULL/BDR00:00:3710.1.1.2GigabitEthernet0/0/0

2. Issue the show ip route command to verify that all networks display in the routing table on all routers.

R1# show ip route

Codes: L – local, 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, H – NHRP, l – LISP

a – application route

+ – replicated route, % – next hop override, p – overrides from PfR

Gateway of last resort is not set

10.0.0.0/8 is variably subnetted, 3 subnets, 2 masks

C10.1.1.0/30 is directly connected, GigabitEthernet0/0/0

L10.1.1.1/32 is directly connected, GigabitEthernet0/0/0

O10.2.2.0/30 [110/2] via 10.1.1.2, 00:01:11, GigabitEthernet0/0/0

192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks

C192.168.1.0/24 is directly connected, GigabitEthernet0/0/1

L192.168.1.1/32 is directly connected, GigabitEthernet0/0/1

O192.168.3.0/24 [110/3] via 10.1.1.2, 00:01:07, GigabitEthernet0/0/0

Step 5:Configure PC host IP settings.

Configure a static IP address, subnet mask, and default gateway for PC-A and PC-C as shown in the IP Addressing Table.

Step 6:Verify connectivity between PC-A and PC-C.

1. Ping from R1 to R3.

If the pings are not successful, troubleshoot the basic device configurations before continuing.

2. Ping from PC-A, on the R1 LAN, to PC-C, on the R3 LAN.

If the pings are not successful, troubleshoot the basic device configurations before continuing.

Note: If you can ping from PC-A to PC-C you have demonstrated that OSPF routing is configured and functioning correctly. If you cannot ping but the device interfaces are up and IP addresses are correct, use the show run, show ip ospf neighbor, and show ip route commands to help identify routing protocol-related problems.

Step 7:Save the basic running configuration for each router.

Save the basic running configuration for the routers as text files on your PC. These text files can be used to restore configurations later in the lab.

Close configuration window

Part 2:Configure SNMPv3 Security using an ACL.

Simple Network Management Protocol (SNMP) enables network administrators to monitor network performance, mange network devices, and troubleshoot network problems. SNMPv3 provides secure access by authenticating and encrypting SNMP management packets over the network. You will configure SNMPv3 using an ACL on R1.

Step 1:Configure an ACL on R1 that will restrict access to SNMP on the 192.168.1.0 LAN.

Open configuration window

1. Create a standard access-list named PERMIT-SNMP.

R1(config)# ip access-list standard PERMIT-SNMP

2. Add a permit statement to allow only packets on R1’s LAN.

R1(config-std-nacl)# permit 192.168.1.0 0.0.0.255

R1(config-std-nacl)# exit

Step 2:Configure the SNMP view.

Configure a SNMP view called SNMP-RO to include the ISO MIB family.

R1(config)# snmp-server view SNMP-RO iso included

Step 3:Configure the SNMP group.

Call the group name SNMP-G1, and configure the group to use SNMPv3 and require both authentication and encryption by using the priv keyword. Associate the view you created in Step 2 to the group, giving it read only access with the read parameter. Finally specify the ACL PERMIT-SNMP, configured in Step 1, to restrict SNMP access to the local LAN.

R1(config)# snmp-server group SNMP-G1 v3 priv read SNMP-RO access PERMIT-SNMP

Step 4:Configure the SNMP user.

Configure an SNMP-Admin user and associate the user to the SNMP-G1 group you configured in Step 3. Set the authentication method to SHA and the authentication password to Authpass. Use AES-128 for encryption with a password of Encrypass.

R1(config)# snmp-server user SNMP-Admin SNMP–G1 v3 auth sha Authpass priv aes 128 Encrypass

R1(config)# end

Step 5:Verify your SNMP configuration.

1. Use the show snmp group command in privilege EXEC mode to view the SNMP group configuration. Verify that your group is configured correctly.

Note: If you need to make changes to the group, use the command no snmp group to remove the group from the configuration and then re-add it with the correct parameters.

R1# show snmp group

groupname: ILMIsecurity model:v1

contextname: <no context specified>storage-type: permanent

readview : *ilmiwriteview: *ilmi

notifyview: <no notifyview specified>

row status: active

groupname: ILMIsecurity model:v2c

contextname: <no context specified>storage-type: permanent

readview : *ilmiwriteview: *ilmi

notifyview: <no notifyview specified>

row status: active

groupname: SNMP-G1security model:v3 priv

contextname: <no context specified>storage-type: nonvolatile

readview : SNMP-ROwriteview: <no writeview specified>

notifyview: <no notifyview specified>

row status: activeaccess-list: PERMIT-SNMP

2. Use the command show snmp user to view the SNMP user information.

Note: The snmp-server user command is hidden from view in the configuration for security reasons. However, if you need to make changes to a SNMP user, you can issue the command no snmp-server user to remove the user from the configuration, and then re-add the user with the new parameters.

R1# show snmp user

User name: SNMP-Admin

Engine ID: 8000000903007079B3923640

storage-type: nonvolatileactive

Authentication Protocol: SHA

Privacy Protocol: AES128

Group-name: SNMP-G1

Close configuration window

Part 3:Configure a Synchronized Time Source Using NTP.

R2 will be the master NTP clock source for routers R1 and R3.

Note: R2 could also be the master clock source for switches S1 and S3, but it is not necessary to configure them for this lab.

Step 1:Set Up the NTP Master using Cisco IOS commands.

R2 is the master NTP server in this lab. All other routers and switches learn the time from it, either directly or indirectly. For this reason, you must ensure that R2 has the correct Coordinated Universal Time set.

Open configuration window

1. Use the show clock command to display the current time set on the router.

R2# show clock

*18:18:25.443 UTC Sun Jan 31 2021

2. To set the time on the router, use the clock set time command.

R2# clock set 11:17:00 Jan 31 2021

R2#

*Jan 31 11:17:00.001: %SYS-6-CLOCKUPDATE: System clock has been updated from 18:19:03 UTC Sun Jan 31 2021 to 11:17:00 UTC Sun Jan 31 2021, configured from console by console.

Jan 31 11:17:00.001: %PKI-6-AUTHORITATIVE_CLOCK: The system clock has been set.

3. Configure NTP authentication by defining the authentication key number, hashing type, and password that will be used for authentication. The password is case sensitive.

R2# config t

R2(config)# ntp authentication-key 1 md5 NTPpassword

4. Configure the trusted key that will be used for authentication on R2.

R2(config)# ntp trusted-key 1

5. Enable the NTP authentication feature on R2.

R2(config)# ntp authenticate

6. Configure R2 as the NTP master using the ntp master stratum-number command in global configuration mode. The stratum number indicates the distance from the original source. For this lab, use a stratum number of 3 on R2. When a device learns the time from an NTP source, its stratum number becomes one greater than the stratum number of its source.

R2(config)# ntp master 3

Step 2:Configure R1 and R3 as NTP clients using the CLI.

1. Issue the debug ntp all command to see NTP activity on R1 as it synchronizes with R2. Review the debug messages as you proceed through this step.

R1# debug ntp all

NTP events debugging is on

NTP core messages debugging is on

NTP clock adjustments debugging is on

NTP reference clocks debugging is on

NTP packets debugging is on

2. Configure NTP authentication by defining the authentication key number, hashing type, and password that will be used for authentication.

R1# config t

R1(config)# ntp authentication-key 1 md5 NTPpassword

R1(config)#

*Jan 31 18:41:23.707: NTP Core(INFO): keys initilized.

*Jan 31 18:41:23.712: NTP Core(NOTICE): proto: precision =usec

*Jan 31 18:41:23.712: %NTP : Drift Read Failed (String Error).

*Jan 31 18:41:23.712: NTP Core(DEBUG): drift value read: 0.000000000

*Jan 31 18:41:23.712: NTP Core(NOTICE): ntpdPPM

*Jan 31 18:41:23.712: NTP Core(NOTICE): trans state : 1

*Jan 31 18:41:23.712: NTP: Initialized interface GigabitEthernet0/0/0

*Jan 31 18:41:23.712: NTP: Initialized interface GigabitEthernet0/0/1

*Jan 31 18:41:23.712: NTP: Initialized interface LIIN0

R1(config)#

*Jan 31 18:41:23.713: NTP Core(INFO): more memory added for keys.

*Jan 31 18:41:23.713: NTP Core(INFO): key (1) added.

3. Configure the trusted key that will be used for authentication. This command provides protection against accidentally synchronizing the device to a time source that is not trusted.

R1(config)# ntp trusted-key 1

R1(config)#

*Jan 31 18:43:56.191: NTP Core(INFO): key (1) marked as trusted.

4. Enable the NTP authentication feature.

R1(config)# ntp authenticate

R1(config)#

*Jan 31 18:44:33.482: NTP Core(INFO): 0.0.0.0 C01C 0C clock_step

5. R1 and R3 will become NTP clients of R2. Use the command ntp server hostname. The host name can also be an IP address.

Note: The command ntp update-calendar may be necessary to periodically updates the calendar with the NTP time for other IOS images.

R1(config)# ntp server 10.1.1.2

R1(config)#

*Jan 31 18:45:29.714: NTP message sent to 10.1.1.2, from interface ‘GigabitEthernet0/0/0’ (10.2.2.1).

*Jan 31 18:45:29.715: NTP message received from 10.1.1.2 on interface ‘GigabitEthernet0/0/0’ (10.2.2.1).

*Jan 31 18:45:29.716: NTP Core(DEBUG): ntp_receive: message received

*Jan 31 18:45:29.716: NTP Core(DEBUG): ntp_receive: peer is 0x80007FA135BB32F8, next action is 1.

*Jan 31 18:45:29.716: NTP Core(DEBUG): Peer becomes reachable, poll set to 6.

*Jan 31 18:45:29.716: NTP Core(INFO): 10.1.1.2 8014 84 reachable

*Jan 31 18:45:29.716: NTP Core(INFO): 10.1.1.2 962A 8A sys_peer

R1(config)#

*Jan 31 18:45:29.716: NTP: step(0xFFFF9D56.B5A1C9F4): local_offset = 0x00000000.00000000, curtime = 0xE3C17949.B74BC8A0

*Jan 31 11:44:32.426: NTP Core(NOTICE): time reset -25257.290500 s

*Jan 31 11:44:32.426: NTP Core(NOTICE): trans state : 4

*Jan 31 11:44:32.426: NTP Core(INFO): 0.0.0.0 C62C 0C clock_step

*Jan 31 11:44:32.426: NTP Core(INFO): 0.0.0.0 C03C 0C clock_step

*Jan 31 11:44:33.423: NTP message sent to 10.1.1.2, from interface ‘GigabitEthernet0/0/0’ (10.2.2.1).

*Jan 31 11:44:33.424: NTP message received from 10.1.1.2 on interface ‘GigabitEthernet0/0/0’ (10.2.2.1).

*Jan 31 11:44:33.424: NTP Core(DEBUG): ntp_receive: message received

*Jan 31 11:44:33.424: NTP Core(DEBUG): ntp_receive: peer is 0x80007FA135BB32F8, next action is 1.

*Jan 31 11:44:33.424: NTP Core(DEBUG): Peer becomes reachable, poll set to 6.

*Jan 31 11:44:33.424: NTP Core(INFO): 10.1.1.2 8034 84 reachable

*Jan 31 11:44:33.425: NTP Core(INFO): 10.1.1.2 964A 8A sys_peer

6. Issue the undebug all or the no debug ntp all command to turn off debugging.

R1# undebug all

7. Verify that R1 has made an association with R2 with the show ntp associations command. You can also use the more verbose version of the command by adding the detail argument. It might take some time for the NTP association to form.

R1# show ntp associations

addressref clockstwhenpoll reachdelayoffsetdisp

~10.1.1.2127.127.1.13146430.000-2800733939.7

*sys.peer, # selected, +candidate, -outlyer, x falseticker, ~ configured

8. Verify the time on R1 after it has made an association with R2.

R1# show clock

*11:49:27.709 UTC Sun Jan 31 2021

9. Repeat the NTP configurations to configure R3 as an NTP client.

Close configuration window

Part 4:Configure syslog Support on R1 and PC-A.

Step 1:Install and start the syslog server.

Free or trial versions of syslog server can be downloaded from the Internet. Use a web browser to search for “free windows syslog server” and refer to the software documentation for more information. Your instructor may also recommend a suitable syslog server for classroom use.

If a syslog server is not currently installed on the host, download a syslog server and install it on PC-A. If it is already installed, go to the next step.

Step 2:Configure R1 to log messages to the syslog server using the CLI.

1. Start the syslog server.
2. Verify that you have connectivity between R1 and PC-A by pinging the R1 G0/0/1 interface IP address 192.168.1.1. If it is not successful, troubleshoot as necessary before continuing.
3. NTP was configured in a previous part to synchronize the time on the network. Displaying the correct time and date in syslog messages is vital when using syslog to monitor a network. If the correct time and date of a message is not known, it can be difficult to determine what network event caused the message.

Verify that the timestamp service for logging is enabled on the router using the show run command. Use the following command if the timestamp service is not enabled.

Open configuration window

R1(config)# service timestamps log datetime msec

4. Configure the syslog service on the router to send syslog messages to the syslog server.

R1(config)# logging host 192.168.1.3

Step 3:Configure the logging severity level on R1.

Logging traps can be set to support the logging function. A trap is a threshold that when reached, triggers a log message. The level of logging messages can be adjusted to allow the administrator to determine what kinds of messages are sent to the syslog server. Routers support different levels of logging. The eight levels range from 0 (emergencies), indicating that the system is unstable, to 7 (debugging), which sends messages that include router information.

Note: The default level for syslog is 6, informational logging. The default for console and monitor logging is 7, debugging.

1. Use the logging trap command to determine the options for the command and the various trap levels available.

R1(config)# logging trap ?

<0-7>Logging severity level

alertsImmediate action needed(severity=1)

criticalCritical conditions(severity=2)

debuggingDebugging messages(severity=7)

emergenciesSystem is unusable(severity=0)

errorsError conditions(severity=3)

informationalInformational messages(severity=6)

notificationsNormal but significant conditions (severity=5)

warningsWarning conditions(severity=4)

<cr>

2. Define the level of severity for messages sent to the syslog server. To configure the severity levels, use either the keyword or the severity level number (0–7).

Note: The severity level includes the level specified and anything with a lower severity number. For example, if you set the level to 4, or use the keyword warnings, you capture messages with severity level 4, 3, 2, 1, and 0.

3. Use the logging trap command to set the severity level for R1.

R1(config)# logging trap warnings

Question:

What is the problem with setting the level of severity too high or too low?

Type your answers here.

Setting it too high (lowest level number) could generate logs that missed some very useful but not critical messages. Setting it too low (highest level number) could generate a large number of messages and fill up the logs with unnecessary information.

If the command logging trap critical were issued, which severity levels of messages would be logged?

Type your answers here.

Emergencies, alerts, and critical messages.

Step 4:Display the current status of logging for R1.

1. Use the show logging command to see the type and level of logging enabled.

R1# show logging

Syslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled)

No Active Message Discriminator.

No Inactive Message Discriminator.

Console logging: level debugging, 72 messages logged, xml disabled,

filtering disabled

Monitor logging: level debugging, 0 messages logged, xml disabled,

filtering disabled

Buffer logging:level debugging, 72 messages logged, xml disabled,

filtering disabled

Exception Logging: size (4096 bytes)

Count and timestamp logging messages: disabled

Persistent logging: disabled

No active filter modules.

Trap logging: level warnings, 54 message lines logged

Logging to 192.168.1.3(udp port 514, audit disabled,

link up),

3 message lines logged,

0 message lines rate-limited,

0 message lines dropped-by-MD,

xml disabled, sequence number disabled

filtering disabled

Logging Source-Interface:VRF Name:

<output omitted>

At what level is console logging enabled?

Type your answers here.

Level 7 – debugging

At what level is trap logging enabled?

Type your answers here.

Level 4 – warnings

What is the IP address of the syslog server?

Type your answers here.

192.168.1.3

What port is syslog using?

Type your answers here.

udp port 514

Step 5:Make changes to the router and monitor syslog results on the PC.

1. Verify that the syslog server is already started on PC-A. Start the server as necessary.
2. To verify that syslog server is logging the message, disable and enable R1’s G0/0/0 interface.

R1(config)# interface g0/0/0

R1(config-if)# shut

.Jan 31 12:02:50.376: %LINK-5-CHANGED: Interface GigabitEthernet0/0/0, changed state to administratively down

.Jan 31 12:02:51.376: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down

R1(config-if)# no shut

.Jan 31 12:03:11.302: %SYS-6-LOGGINGHOST_STARTSTOP: Logging to host 192.168.1.4 port 514 started – CLI initiated

.Jan 31 12:03:14.365: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up

.Jan 31 12:03:15.365: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up

.Jan 31 12:03:59.894: %OSPF-5-ADJCHG: Process 1, Nbr 10.2.2.2 on GigabitEthernet0/0/0 from LOADING to FULL, Loading Done

Close configuration window

3. Navigate to PC-A to view the syslog messages.

Router Interface Summary Table

Blank Line, No additional information

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. There is no way to effectively list all the 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 may contain one. An example of this might be 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 Configs

Router R1

R1# show run

Building configuration…

Current configuration : 1682 bytes

!

version 16.9

service timestamps debug datetime msec

service timestamps log datetime msec

platform qfp utilization monitor load 80

platform punt-keepalive disable-kernel-core

!

hostname R1

!

boot-start-marker

boot-end-marker

!

no aaa new-model

!

no ip domain lookup

!

login on-success log

!

subscriber templating

!

multilink bundle-name authenticated

!

spanning-tree extend system-id

!

redundancy

mode none

!

interface GigabitEthernet0/0/0

ip address 10.1.1.1 255.255.255.252

negotiation auto

!

interface GigabitEthernet0/0/1

ip address 192.168.1.1 255.255.255.0

negotiation auto

!

router ospf 1

passive-interface GigabitEthernet0/0/1

network 10.1.1.0 0.0.0.3 area 0

network 192.168.1.0 0.0.0.255 area 0

!

ip forward-protocol nd

no ip http server

ip http secure-server

!

ip access-list standard PERMIT-SNMP

permit 192.168.1.0 0.0.0.255

logging trap warnings

logging host 192.168.1.3

!

snmp-server group SNMP-G1 v3 priv read SNMP-RO access PERMIT-SNMP

snmp-server view SNMP-RO iso included

!

control-plane

!

line con 0

logging synchronous

transport input none

stopbits 1

line aux 0

stopbits 1

line vty 0 4

login

!

ntp authentication-key 1 md5 1439263B1C05393833272131 7

ntp authenticate

ntp trusted-key 1

ntp server 10.1.1.2

!

end

Router R2

R2# show run

Building configuration…

Current configuration : 1243 bytes

!

version 16.9

service timestamps debug datetime msec

service timestamps log datetime msec

platform qfp utilization monitor load 80

platform punt-keepalive disable-kernel-core

!

hostname R2

!

boot-start-marker

boot-end-marker

!

no aaa new-model

!

no ip domain lookup

!

login on-success log

!

subscriber templating

!

multilink bundle-name authenticated

!

spanning-tree extend system-id

!

redundancy

mode none

!

interface GigabitEthernet0/0/0

ip address 10.1.1.2 255.255.255.252

negotiation auto

!

interface GigabitEthernet0/0/1

ip address 10.2.2.2 255.255.255.252

negotiation auto

!

router ospf 1

network 10.1.1.0 0.0.0.3 area 0

network 10.2.2.0 0.0.0.3 area 0

!

ip forward-protocol nd

no ip http server

ip http secure-server

!

control-plane

!

line con 0

logging synchronous

transport input none

stopbits 1

line aux 0

stopbits 1

line vty 0 4

login

!

ntp authentication-key 1 md5 0228306B1B071C325B411B1D 7

ntp authenticate

ntp trusted-key 1

ntp master 3

!

end

Router R3

R3 show run

Building configuration…

Current configuration : 1452 bytes

!

version 16.9

service timestamps debug datetime msec

service timestamps log datetime msec

platform qfp utilization monitor load 80

platform punt-keepalive disable-kernel-core

!

hostname R3

!

boot-start-marker

boot-end-marker

!

no aaa new-model

!

no ip domain lookup

!

login on-success log

!

subscriber templating

!

multilink bundle-name authenticated

!

spanning-tree extend system-id

!

redundancy

mode none

!

interface GigabitEthernet0/0/0

ip address 10.2.2.1 255.255.255.252

negotiation auto

!

interface GigabitEthernet0/0/1

ip address 192.168.3.1 255.255.255.0

negotiation auto

!

router ospf 1

passive-interface GigabitEthernet0/0/1

network 10.2.2.0 0.0.0.3 area 0

network 192.168.3.0 0.0.0.255 area 0

!

ip forward-protocol nd

no ip http server

ip http secure-server

!

logging trap warnings

logging host 192.168.1.3

!

control-plane

!

line con 0

logging synchronous

transport input none

stopbits 1

line aux 0

stopbits 1

line vty 0 4

login

!

ntp authentication-key 1 md5 002A2736145A1815182E5E4A 7

ntp authenticate

ntp trusted-key 1

ntp server 10.1.1.2

!

end

• Recommend