CCNPv6 ROUTE
Chapter 3 Lab 3-3, OSPF Virtual Links and Area Summarization
I purposed this blog post for easy referencing who Labbing CCNP OSPF route .All Sources is according to CCNP lab manual . I'm also a learner who trying to get CCNP Certi . Cheer All bro .
Objectives
- Configure multi-area OSPF on a router.
- Verify multi-area behavior.
- Create an OSPF virtual link.
- Summarize an area.
- Generate a default route into OSPF.
Step 2: Add interfaces into OSPF.
Note: The default behavior of OSPF for loopback interfaces is to advertise a 32-bit host route. To ensure that the full /24 network is advertised, use the ip ospf network point-to-point command. Change the network type on the loopback interfaces so that they are advertised with the correct subnet.
Step 3: Create a virtual link
Q : What would happen if routes could pass between areas without going through the backbone?
Ans : Routing loops might occur because any route could get advertised to different areas. By passing through the backbone, type 3 LSAs are generated by their respective areas and not sent back in
Q : When are virtual links useful?
Ans : Virtual links are useful when there needs to be a temporary extension of the backbone, either because the backbone became discontinuous or a new area got added onto an existing area.
Q : Why are virtual links a poor long-term solution?
Ans : Virtual links are a poor long-term solution because they add processing overhead and basically extend the backbone area onto routers where it might not belong. They can also add a lot of complexity to troubleshooting.
Step 4: Summarize an area
Loopbacks 100 through 103 can be summarized into one supernet of 192.168.100.0 /22.
Step 5: Generate a default route into OSPF.
You can simulate loopback 30 on R1 to be a connection to the Internet. You do not need to advertise this specific network to the rest of the network. Instead, you can just have a default route for all unknown traffic to go to R1.
Use the following Tcl script to verify connectivity to all addresses in the topology
R1# tclsh
R1(tcl)#
foreach address {
10.1.1.1
10.1.2.1
10.1.3.1
10.1.12.1
10.1.12.2
10.1.23.2
10.1.23.3
172.30.30.1
192.168.100.1
192.168.101.1
192.168.102.1
192.168.103.1
} {
ping $address }
Challenge: Configure OSPF Authentication
Configure OSPF MD5 authentication on the link between R2 and R3, using key ID 1 and the password cisco. Record the commands used below.
Enter the following configuration commands on R2 and R3:
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 cisco
Final Configuration For Lab and used c3725-advsecurityk9-mz.124-19b image for GNS 3 Lab
R1#sh running-config
Building configuration...
Current configuration : 1257 bytes
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
ip cef
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
no ip domain lookup
ip domain name lab.local
!
interface Loopback1
description Engineering Department
ip address 10.1.1.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback30
ip address 172.30.30.1 255.255.255.252
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.1 255.255.255.0
clock rate 64000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router ospf 1
log-adjacency-changes
network 10.1.1.0 0.0.0.255 area 0
network 10.1.12.0 0.0.0.255 area 0
default-information originate always
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
end
======================================================
R2#sh running-config
Building configuration...
Current configuration : 1317 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
ip cef
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
p domain lookup
ip domain name lab.local
!
interface Loopback2
description Marketing Department
ip address 10.1.2.1 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.12.2 255.255.255.0
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
ip address 10.1.23.2 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 cisco
clock rate 64000
!
router ospf 1
log-adjacency-changes
area 23 virtual-link 192.168.103.1
network 10.1.2.0 0.0.0.255 area 0
network 10.1.12.0 0.0.0.255 area 0
network 10.1.23.0 0.0.0.255 area 23
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
end
=====================================================
R3#sh running-config
Building configuration...
Current configuration : 1739 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
no aaa new-model
memory-size iomem 5
ip cef
!
ip auth-proxy max-nodata-conns 3
ip admission max-nodata-conns 3
!
no ip domain lookup
ip domain name lab.local
!
interface Loopback3
description Accounting Department
ip address 10.1.3.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback100
ip address 192.168.100.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback101
ip address 192.168.101.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback102
ip address 192.168.102.1 255.255.255.0
ip ospf network point-to-point
!
interface Loopback103
ip address 192.168.103.1 255.255.255.0
ip ospf network point-to-point
!
interface FastEthernet0/0
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/0
ip address 10.1.23.3 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 cisco
clock rate 2000000
!
interface FastEthernet0/1
no ip address
shutdown
duplex auto
speed auto
!
interface Serial0/1
no ip address
shutdown
clock rate 2000000
!
router ospf 1
log-adjacency-changes
area 23 virtual-link 10.1.2.1
area 100 range 192.168.100.0 255.255.252.0
network 10.1.3.0 0.0.0.255 area 23
network 10.1.23.0 0.0.0.255 area 23
network 192.168.100.0 0.0.3.255 area 100
!
ip forward-protocol nd
!
no ip http server
no ip http secure-server
!
control-plane
!
line con 0
exec-timeout 0 0
privilege level 15
logging synchronous
line aux 0
exec-timeout 0 0
privilege level 15
logging synchronous
line vty 0 4
login
!
end
With Regards,
Zaw Min Htann
