Physical Topology to Logical Topology
Knowing how to convert a physical topology into a logical topology that suits your demand is the first thing you have to do for your network to get up and run. In practical most of the networks are connected like this:
As you can see, all the routers are connected to two switches Sw1 & Sw2. If the network is large enough, Sw1 & Sw2 should belong to Core layer which requires high speed switching because they have to do hardest work in the network. They should be powerful to mitigate congestion if occurs. Redundancy is also very important in this layer by providing multiple paths so that when a link goes down packets can still travel to the destination. Sw3 & Sw4 requires less power to proceed traffic and they should belong to Distribution layer. The last layer, which is not presented here is the Access Layer where switches are connected directly to the end users/terminals. In fact Sw3 and Sw4 can be used in Access Layer if the network is not large.
So how can we convert a physical topology to a logical topology as shown below?
The answer is we will need to use VLAN, trunking, subinterfaces to achieve this. Let’s start with the first section of R1-R2-R6.
Note: You can download the Initial Config & Final Config of this lab here (open with Packet Tracer v5.3.3 or above): http://www.rstut.com/download/Physical_Topology_to_Logical_Topology.zip. We tested and all the configuration in this lab worked very well.
Section R1-R2-R6
We see all three routers R1, R2 & R6 use fa0/0 interfaces to connect to each other in this section and they all are connected to Sw1 in the physical topology so we only need to assign VLAN 126 to three corresponding ports on Sw1.
| SW1: interface range fa0/1 – 2, fa0/6 switchport access vlan 126 |
After typing above commands we will see a message like this:
| % Access VLAN does not exist. Creating vlan 126 |
That means SW1 does not have Vlan 126 previously so it created one automatically.
Of course we will assign IP addresses on these routers and “no shut” them so that we can ping among them:
| R1: interface fa0/0 ip address 10.10.126.1 255.255.255.0 no shutdown |
R2: interface fa0/0 ip address 10.10.126.2 255.255.255.0 no shutdown |
R6: interface fa0/0 ip address 10.10.126.6 255.255.255.0 no shutdown |
Now we can ping between them successfully:
| R1#ping 10.10.126.2
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 10.10.126.2, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 0/0/1 ms |
The first ping fails because whenever a router first sends a packet to a next-hop that has no entry in the ARP table, it has to send out an ARP Request first and wait for a reply. That waiting time causes the first packet to be dropped.
Section R2-R3
From the physical topology we learn that fa0/1 of R2 is connecting to Sw2 while fa0/0 of R3 is connecting to Sw1. Therefore if we want to connect these two interfaces we have to configure a trunking link between Sw1 & Sw2. In this part we only set fa0/23 of Sw1 & Sw2 as trunk links while turning off other switch-to-switch ports to make the explanation simple.
|
Sw1 & Sw2: interface fa0/23 |
Fa0/1 of R2 is connecting to SW2 so we configure Vlan 23 on this switch:
| Sw2: interface fa0/2 switchport access vlan 23 no shutdown |
Configure IP address on fa0/1 of R2:
| R2: interface fa0/1 ip address 10.10.23.2 255.255.255.0 no shutdown |
We see on R3, interface fa0/0 is connected to 2 different networks (one is R2-R3, the other is R3-R4-R5) so we have to use sub-interface on R3.
| R3: interface fa0/0 no shut interface fa0/0.23 encapsulation dot1q 23 ip address 10.10.23.3 255.255.255.0 |
on Sw1 we have to declare the port connected to R3 as trunk as we are using subinterface on R3.
| Sw1: interface fa0/3 switchport trunk encapsulation dot1q switchport mode trunk |
Notice that SW1 still does not have Vlan 23 because we set trunking on fa0/3 so we have to manually createVlan 23 on SW1:
| Sw1(config)#vlan 23 |
Note: If we don’t create Vlan 23 on Sw1, it will drop frames belong to Vlan 23 sent to it.
In the next part we will continue learning how to configure Section R3-R4-R5 & Section R6-R7-R8
good article. thanks
Great
Nice Practice
How many lab questions do you get in the LAB exam?
Best material do study for CCIE LAB and Writen exam:
http://cafecomredes.blogspot.com.br/2014/12/materiais-ccie-r-workbook-video-aulas.html
🙂
Hey guys,
Here you can download almost all Cisco Press Books:
http://cafecomredes.blogspot.com.br/2015/05/colecao-cisco-press-download.html
Bye
shouldn’t we add vlan 345 on SW1 port 0/3?
sorry what i meant is Sw1(config)#vlan345
CCIE R&S Practice Labs ……………can someone make this in Packet Tracer…would be great
oh man! thanks you for the easy to understand explanation..U see i downloaded IOU-WEB VM v22 RSv5 UD for INE lab. I didn’t have the slightest idea how to go about in doing the lab especially the physical topology setup until and read this…thanks!
Excellent material as always! Good read and refresher!
http://wikisend.com/download/726086/physical2logical-topoplogy.pkt
Worked out succesfully !
Hi Guys,
Is anyone interested in discussing the CCIE R&S dumps.
Skpe id – asha02839
Hi Guys,
Is anyone interested in discussing the CCIE R&S Lab dumps.
Skpe id – asha02839
Hi Guys,
Is anyone interested in sharing the cost to buy ccie lab dumps.
Skpe id – asha02839
Hello Guys
Can anyone please assist me in setting up the the LAB .. if you need my e-mail: {email not allowed}
Anyone interested in buying pssleader dumps for written and lab.
Very special price with new updates as they come.
contact Skpe id – asha02839
new CCIE Dumps is comin
http://cciers.spoto.net
Hello Dears,
can anyone share CCIE labs for practices or can guide where I can find such files (config iou files, diagrams, answers and questions) ??
BR,
Hi guys, are this tut LAB practices any similar to the real exam? or are they actually part of the exam?
Thanks for your help. I passed my CCIE certification exam using https://www.lab4ccie.com/. I suggest the users to look the question answers and CCIE Data Center Lab very carefully. Some answers in the exams changed the sequence. You need read the questions very carefully.
Hello,
Someone reported that there is a NEW CONFIG in the CCIE Lab since the 25th of september 2017.
Did someone else got it ? Or is it a fake news ?
Thanks !
Coool for latest dumps, but how to have the PDF for rs lab ?
Anybody with passed Rs latest lab ?
Hi Chris can we you create a lab study group. i also preparing for my lab soon.
Really nice articles…enjoy…
https://ipcisco.com/ccie/
Hi, im preparing for CCIE R & S Lab exam.
can anyone send me materials? its much appreciated.
pack3tdr0p AT gmail DOT COM
thank you in advance
@NAN AThank you for sharing, I found that the information inside is really effective.
@NAN A
Any valid materials for CCIE lab exam?
asha02839
skype
W ww.cci
edumps.xyz?utm_source=bbs&utm_medium=bbs
I just passed the CCIE200-101 exam last week. I bought the topic here. The topic is true and effective. I have practiced most of the exam questions, but you have to remember the answer. You can’t just remember it. The options, I have encountered several questions in it, the options for the correct answer have been changed.
Looking for a exam material, but worried about finding a fake material site, I just passed the cisco exam, I used my actual experience to tell you that the material provided by url is effective and very stable, I use the material and I participate The exam questions at the exam were exactly the same, so I passed the exam very smoothly. I recommended this good exam material site to everyone and wish everyone a successful exam.
w ww.cci edum ps.xyz/ccna_d umps.php?utm_so urce=bbs
just passed the exam.
thx passhot dot com
Recently I bought Cisco Expert-Level Traning for CCIE from Cisco Network store.
Anyone interested to share the price, so I can give you the labs. There are 25 labs.
Hey CCIELab. I’m interested.
Hi SHP, you can send me email first to tuhink2019 at gmail dot com
Hi SHP, you can send me email first to tuhink2019 at gmail dot com
Hi SHP, please send me email to kunwar.binod56 at gmail dot com
share latest exam questions
look my name
Congratulations!!!
Hi guys
I went to the exam yesterday and it was successful!
SECTION 1: Layer 2 Technologies
Section-1.1: LAN Access
The following requirements were pre-configured:
● VTP is turned off in all switches.
● All required VLAN including access-ports configuration in all relevant switches are
provisioned.
● All required SVI interfaces in all relevant switches (including IP address and subnet
mask) are provisioned.
Configure the network in all sites as per the following requirements:
● Access-ports must immediately transition to the forwarding state upon link up, as long as they do not receive a BPDU. Use the minimal number of commands per switch to enable this feature.
● If an access-port receives a BPDU, it must automatically shutdown. Use the minimal number of commands per switch to enable this feature.
● Ports that were shutdown must attempt to automatically recover after 10 minutes.
● None of the switches may generate a TC (Topology Change) or a TCN (Topology Change Notification) when any of access ports goes down.
Cisco will change in 2020, the guys who want to take the exam should hurry.
So go to the exam as soon as possible!
Good luck!
P:pass
H:hot
I used the dump of the PH to pass the exam.
at PH dooooooooot com
Dear Mike,
Congratulations! I am preparing for CCIE RS Lab exam which I will write in August 2019,Please share your materials to me? elsh27gb @ gmail.com is my adders. thank you.
today i pass ccie rs 400-101 exam
Share the test bank for my exam
http:/**/c7.gg/fCXw8
Hi guys download the RnS v5 WEB IOU
“*ccielabcenter*com/free/iou-web-ccie-rs-h3-lab3/
Thanks Lee , downloaded the iou from the above link.
its working , also there are other free iou which i downloaded from website.
great job
mega link for VM (CCIE R&Sv5 ALL Labs Loaded
**mega.nz/#!7ixWCARQ!PfEe42IDKS9oY6JkhtwY3JXN7Z4hQ24vCAZPmyt-0Do
Downloaded vm from above link.
keep on sharing free materials, helping a lot in preparation.
lab 2.2 vm not available in the link.
pls share vm fro lab 2.2 lab also
##### CCIE R&S LAB 1 PDF #####
https://mega.nz/#!b24yAALK!h9ejClIPTs-FSUCMC2g3_SRV4rHFyFg4H4mV4OnQa5w
Hey mate thanks for sharing the lab 1.1 WB.
Kindly share the other wb also.