Packet Tracer Help

[itsadmin2187]

Hi Everyone,

I am redesigning our network to the PT design attached, but I cannot ping anything out of the L2 switches and cannot figure out why. I have literally spent 12 hours staring at the configurations and am getting ready to start over, but thought maybe someone might see something wrong.

To summarize the design. We have 2 buildings. Both buildings will have a VLAN 40 and 125 for our datacenter, a VLAN for drops, a VLAN for phones, and a VLAN for Wifi. We have redundant lines that we plan on configuring for etherchannel and redundant ISP connections (not shown). At the moment nothing is able to get an IP Address since they cannot reach the DHCP server, but even if I set a static IP I cannot ping, so I believe it has something to do with the "BACKBONE" L3 switches. I have not yet fully configured OSPF, since I ran into this issue, but I plan to configure that as well down the line. I am studying for my CCNA and understand quite a bit, but I think I am missing something here, so for the sake of learning, an explanation would be appreciated.

I would truly appreciate someone taking a look at PT and see if I configured something incorrectly.

Thank you

Cisco wouldn't let me attach the PKT file, so below is the link to it on Google Drive.

https://drive.google.com/open?id=1e6iVzZjks-EYbd0Bmd-Q3TDhEiyYG7Vq

-Jon 

[Diana Karolina Rojas]

Hello,

I found a mistake in your configuration, you need to configure the layer 2 vlans in your "Backbone" otherwise the interface vlan will never come to "up" "up" state.

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Best Regards,

[Deepak Kumar · Accepted solution]

Hi,

You made many issues with the configuration of the Backbone switch configuration.

Below are the highlighted. 

A). No Layer 2 VLAN configuration. I found only L3 SVI was created on both Backbone switches. 

B). Duplicate IP address on both Backbone Switches under the SVI configurations.

C). Wrong port configuration where your DHCP server is attached to Switch "OPS.BACKBONE". If your server can't understand the VLANs then you must configure a port as Access.

How to Tshoot your issue:

No Layer 2 VLAN configuration. I found only L3 SVI was created on both Backbone switches.

VSO.BACKBONE#sho vlan

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/4, Fa0/5, Fa0/6, Fa0/7
                                                Fa0/8, Fa0/9, Fa0/10, Fa0/11
                                                Fa0/12, Fa0/13, Fa0/14, Fa0/15
                                                Fa0/16, Fa0/17, Fa0/18, Fa0/19
                                                Fa0/20, Fa0/21, Fa0/22
40   DATA                             active    Fa0/2, Fa0/3
1002 fddi-default                     active    
1003 token-ring-default               active    
1004 fddinet-default                  active    
1005 trnet-default                    active    

VLAN Type  SAID       MTU   Parent RingNo BridgeNo Stp  BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1    enet  100001     1500  -      -      -        -    -        0      0
40   enet  100040     1500  -      -      -        -    -        0      0
1002 fddi  101002     1500  -      -      -        -    -        0      0   
1003 tr    101003     1500  -      -      -        -    -        0      0   
1004 fdnet 101004     1500  -      -      -        ieee -        0      0   
1005 trnet 101005     1500  -      -      -        ibm  -        0      0   

Loopback0              2.2.2.2         YES manual up                    up 
Vlan1                  172.16.254.105  YES manual up                    up 
Vlan40                 10.16.40.1      YES manual up                    up 
Vlan41                 10.16.41.1      YES manual down                  down 
Vlan42                 10.16.42.1      YES manual down                  down 
Vlan43                 10.16.43.1      YES manual down                  down 
Vlan44                 10.16.44.1      YES manual down                  down 
Vlan45                 10.16.45.1      YES manual down                  down 
Vlan50                 10.16.50.1      YES manual down                  down 
Vlan60                 10.16.60.1      YES manual down                  down 
Vlan125                10.16.125.1     YES manual down                  down 
Vlan141                10.16.141.1     YES manual down                  down 
Vlan142                10.16.142.1     YES manual down                  down 
Vlan143                10.16.143.1     YES manual down                  down 
Vlan144                10.16.144.1     YES manual down                  down 
Vlan145                10.16.145.1     YES manual down                  down 
Vlan241                10.16.241.1     YES manual down                  down 
Vlan242                10.16.242.1     YES manual down                  down 
Vlan243                10.16.243.1     YES manual down                  down 
Vlan244                10.16.244.1     YES manual down                  down 
Vlan245                10.16.245.1     YES manual down                  down

Here you can see that There is no VLAN existing and SVI is showing DOWN.

What configuration was missed on Both Switches:

VSO.BACKBONE(config)#vlan 40
VSO.BACKBONE(config-vlan)#vlan 41
VSO.BACKBONE(config-vlan)#vlan 42
VSO.BACKBONE(config-vlan)#vlan 43
VSO.BACKBONE(config-vlan)#vlan 44
VSO.BACKBONE(config-vlan)#vlan 45
VSO.BACKBONE(config-vlan)#vlan 50
VSO.BACKBONE(config-vlan)#vlan 60
VSO.BACKBONE(config-vlan)#vlan 125
VSO.BACKBONE(config-vlan)#vlan 141
VSO.BACKBONE(config-vlan)#vlan 142
VSO.BACKBONE(config-vlan)#vlan 143
VSO.BACKBONE(config-vlan)#vlan 144
VSO.BACKBONE(config-vlan)#vlan 145
VSO.BACKBONE(config-vlan)#vlan 241
VSO.BACKBONE(config-vlan)#vlan 242
VSO.BACKBONE(config-vlan)#vlan 243
VSO.BACKBONE(config-vlan)#vlan 244
VSO.BACKBONE(config-vlan)#vlan 245
VSO.BACKBONE(config-vlan)#exit

B). Duplicate IP address on both Backbone Switches under the SVI configurations.

Loopback0              2.2.2.2         YES manual up                    up 
Vlan1                  172.16.254.104  YES manual up                    up 
Vlan40                 10.16.40.1      YES manual up                    up 
Vlan41                 10.16.41.1      YES manual up                    up 
Vlan42                 10.16.42.1      YES manual up                    up 
Vlan43                 10.16.43.1      YES manual up                    up 
Vlan44                 10.16.44.1      YES manual up                    up 
Vlan45                 10.16.45.1      YES manual up                    up 
Vlan50                 10.16.50.1      YES manual up                    up 
Vlan60                 10.16.60.1      YES manual up                    up 
Vlan125                10.16.125.1     YES manual up                    up 
Vlan141                10.16.141.1     YES manual up                    up 
Vlan142                10.16.142.1     YES manual up                    up 
Vlan143                10.16.143.1     YES manual up                    up 
Vlan144                10.16.144.1     YES manual up                    up 
Vlan145                10.16.145.1     YES manual up                    up 
Vlan241                10.16.241.1     YES manual up                    up 
Vlan242                10.16.242.1     YES manual up                    up 
Vlan243                10.16.243.1     YES manual up                    up 
Vlan244                10.16.244.1     YES manual up                    up 
Vlan245                10.16.245.1     YES manual up                    up
OPS.BACKBONE#   

Loopback0              2.2.2.2         YES manual up                    up 
Vlan1                  172.16.254.105  YES manual up                    up 
Vlan40                 10.16.40.1      YES manual up                    up 
Vlan41                 10.16.41.1      YES manual up                    up 
Vlan42                 10.16.42.1      YES manual up                    up 
Vlan43                 10.16.43.1      YES manual up                    up 
Vlan44                 10.16.44.1      YES manual up                    up 
Vlan45                 10.16.45.1      YES manual up                    up 
Vlan50                 10.16.50.1      YES manual up                    up 
Vlan60                 10.16.60.1      YES manual up                    up 
Vlan125                10.16.125.1     YES manual up                    up 
Vlan141                10.16.141.1     YES manual up                    up 
Vlan142                10.16.142.1     YES manual up                    up 
Vlan143                10.16.143.1     YES manual up                    up 
Vlan144                10.16.144.1     YES manual up                    up 
Vlan145                10.16.145.1     YES manual up                    up 
Vlan241                10.16.241.1     YES manual up                    up 
Vlan242                10.16.242.1     YES manual up                    up 
Vlan243                10.16.243.1     YES manual up                    up 
Vlan244                10.16.244.1     YES manual up                    up 
Vlan245                10.16.245.1     YES manual up                    up
VSO.BACKBONE#  

What configuration was missed:

You must be assigned a unique IP address on each device.

VSO.BACKBONE#  
Interface VLAN 40
NO IP address

Wrong port configuration where your DHCP server is attached to Switch "OPS.BACKBONE".

interface FastEthernet0/1
 switchport access vlan 40
 switchport trunk encapsulation dot1q
 switchport mode trunk
 switchport nonegotiate

This port must be configured as Access port:

What configuration was missed:

interface FastEthernet0/1
 switchport access vlan 40
 switchport mode access

I hope this will clear all points.

Regards,

Deepak Kumar

[itsadmin2187]

Ahh... it all makes perfect sense now.

I configured VTP for the backbone L3 switches, configured DHCP to start handing out addresses at X.X.X.10, and changed the SVI IP Addresses on one switch to X.X.X.2. I had the DHCP interface configured to access, since that is what I would normally do if it was connected to a layer 2 switch, but I am not very familiar with Layer 3 switching, thus all of this confusion. It all makes sense now. The switch does both layer 2 and 3 as needed/configured. I also configured the etherchannels without issue and am able to ping across the network. 

Thank you for your help!

-JD

[itsadmin2187]

FYI, Very thorough! I appreciate all of the information, which helped me understand Layer 3 switching. I hopefully will be configuring this on the network within the next month and hopefully will not have too many issues.

Thanks again.

-JD