CCNP
Lab Documentation:
In this below
network scenario there are five manageable routers named R1, R2, R3, R4, R5
where different types of configuration has been done and one switch also
connected but there is nothing
configuration has been done in switch. In the below Scenario R1 router works as
a ASBR (Autonomous System Border Router) because it is connected with the
others routes where OSPF protocol has not been configured. R2 & R3 Router
works as a ABR (Area Border Router) because these routers are border router for
Area 0 to Area 10 and Area 0 to Area 20. Following configuration has been done
in below Router
On router 1.
1. Host name has
been changed in R1. R1(config)#R1(config)#hostname
R1R1(config)#hostname R1
2. Ip address
172.30.0.1 /24 has been assign on interface fa 0/0.
R1(config)#interface
FastEthernet0/0
R1(config)#ip
address 172.30.0.1 255.255.255.0
R1(config)#no
shutdown
3. Static routing
has been done for Null0
R1(config)#
ip route 172.16.0.0 255.255.255.0
Null0
R1(config)#
ip route 172.16.1.0 255.255.255.0
Null0
R1(config)#
ip route 172.16.2.0 255.255.255.0
Null0
R1(config)#
ip route 172.16.3.0 255.255.255.0
Null0
On Router 2.
1. Host name has
been changed in R2 using same command used by R1 Router.
2. Ip address
172.30.0.2 / 24 has been assign for int fa 0/0
3. Ip address
172.30.10.2 / 24 has been assign for int se 0/0
4. Bandwidth has
been fixed at 500kbps using this command R2(config-if)#bandwidth
500
On Router 3.
1. Host name has
been changed in R3 using same command used by R1 Router.
2. Ip address
172.30.0.3 / 24 has been assign for int fa 0/0
3. Ip add ress
172.30.20.3 /24 has been assign for int
se 0/0
4. Bandwidth has
been fixed at 500kbps using same command used by R2 router
On Router 4.
1. Host name has
been changed in R4 router using same command used by R1 Router
2. Four Loopback ip
address has been assign in Router 4 using below command
R4(config)#interface
loopback1
R4(config)#ip address 10.20.0.1 255.255.255.0
R4(config)#interface
loopback2
R4(config)#ip address 10.20.1.1 255.255.255.0
R4(config)#interface
loopback3
R4(config)#ip address 10.20.3.1 255.255.255.0
R4(config)#interface
loopback4
R4(config)#ip address 10.20.4.1 255.255.255.0
3. Ip address
172.30.20.4 / 24 has been assign for int se 0/0 with 500 kbps bandwidth.
On Router 5.
1. Host name has
been changed in R5 router using same command used by R1 Router
2. Four Loopback ip
address has been assign in Router 5 using same command used by R4 router.
(Here
R5 router used 10.10.0.0 / 24 to 10.10.3.0 network for loopback interface)
3. Ip address
172.30.20.4 / 24 has been assign for int se 0/0 with 500 kbps bandwidth.
Objective:-
1. Configure OSPF for the above network diagram. R1 will act as an
ASBR by redistributing a series of static routes into the OSPF network. These
routes should NOT increment their metric as they pass through the network and
should have an initial OSPF cost of 200. All routers should have a router-id
reflecting their hostname; you should be able to ping this router-id throughout
the entire OSPF network.
Explanation of Objective:
#config t
#router ospf 1 (Configuring OSPF)
#router id 1.1.1.1 (Assigning Hard Code Router ID) if we don’t assign hard
code router ID manually highest loopback ip address
will be the router ID, if there is no loopback IP address Highest physical Ip
address will be the Router ID.
#network 172.30.0.1
0.0.0.0 area 0 (Assigning specific interface ip
address for OSPF)
#network 1.1.1.1
0.0.0.0 area 0 (using this command Router
broadcast Router ID 1.1.1.1 to the OSPF network
#default metric 200 (this command is used to stop the increment their metric)
Let’s make an loopback interface for each router to able to
ping this routed Id throughout the entire OSPF network.
#config t
#int loopback 1
#ip address 1.1.1.1
255.255.255.255
Note: use the area 0
for ABR router and use their own area Number in remaining router to advertise
the router ID on ospf network
2. after completing the initial step of the lab, one of the routers
in Area 0 will become the DR and one will become the BDR for the Ethernet
segment. Which router will become the DR and BDR? Write DR and BDR next to the
respective router below.
o R1
o R2
o R3
Answer:
Router 3 become the DR and Router 2 become the BDR after the completing the
initial step of the lab.
Let’s
make DR and BDR next to the respective router R1, R2, R3 using the following
command.
R1#config t
#int fa 0/0
#ip ospf priority 255
R2#conf t
#int fa 0/0
#ip ospf priority 254
By default interface priority value has been set 1, Highest
priority value will be the DR router. O priority value doesn’t go in to the DR
/ BDR election process.
3. Ensure R1 becomes the DR on the Ethernet segment in Area 0. R2
and R3 should not become a DR or BDR for the Ethernet segment in Area 0. After
this change is made, what type of neighbor relationship should exist between R1
and R2? What about R2 and R3?
Let’s
make R1 as a DR router let’s make R2 and R3 router not a DR / BDR router using
following command.
R2#conf t
#int fa 0/0
#ip ospf priority 0
R3#conf t
#int fa 0/0
#ip ospf priority 0
Now in the above network scenario R1 will become the DR
router because its priority vale has 255 and R2 and R3 doesn’t go in to the DR
/ BDR election process because its priority value has been set 0.
Answer
after change is made the Relationship between R1 and R2 exist Full / DR and the relationship between R2 and
R3 exist 2way / DOTHER.
4. Implement summarization at the ABRs in the network to make the
routing tables throughout the network as efficient as possible.
Let’s summarize the ABR router to make the
routing tables throughout the network as efficient as possible.
To summarize the routing tables use the below
command.
R2#conf t
#router ospf 1
#area 10 range
10.10.0.0 255.255.252.0
R3#conf t
#router ospf 1
#area 20 range
10.20.0.0 255.255.252.0
|
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5. Implement summarization at the ASBR. The summary route should have
the same attributes as the original, individual routes redistributed into the
network.
Nothing different to summarize on ABR router
and ASBR router conceptually but its command is totally different from each
other. To summarize on ASBR router use the following command.
R1#config t
#router ospf 1
#summary-address
172.16.0.0 255.255.252.0
6. The organization plans to
upgrade to Gigabit Ethernet in the coming months. OSPF should accurately
calculate its metric assuming Gigabit Ethernet will be the fastest link in the
network.
This
is too much tricky question. Here in the above network scenario fast Ethernet
has been used which can carry the data up to 100Mbps. So its metric is 1 which
comes from 100 / Mbps. If we set the auto-cost reference bandwidth 1000 its
metric will be 10. After one month later organization will upgrade gigabit
Ethernet at that time its metric will be 1 which comes from 1000 / Mbps.
To
change the reference bandwidth use the following command
R1#conf t
#ruter ospf 1
#auto-cost reference
bandwidth 1000
Configure
in all router using above mention same command.
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