I am trying to set up a network topology in Cisco Packet Tracer, but I’m experiencing issues with VLAN trunking and connectivity between core and distribution switches. Here are the details of my setup and the steps I’ve taken so far:
Network Topology:
- Core Switches: Core1 (192.168.0.1) and Core2 (192.168.0.2)
- Distribution Switches: Dist1 (192.168.1.1) and Dist2 (192.168.1.2)
- All switches are Cisco 3560-24PS
Connections:
- Core1 FastEthernet0/1 connected to Core2 FastEthernet0/1
- Core1 FastEthernet0/2 connected to Dist1 FastEthernet0/1
- Core1 FastEthernet0/3 connected to Dist2 FastEthernet0/1
- Core2 FastEthernet0/2 connected to Dist1 FastEthernet0/2
- Core2 FastEthernet0/3 connected to Dist2 FastEthernet0/2
- Dist1 FastEthernet0/3 connected to Dist2 FastEthernet0/3
Configurations:
Core1 Configuration:
enable
configure terminal
hostname Core1
interface range fastethernet 0/1-24
no shutdown
exit
interface fastethernet 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/2
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/3
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface vlan 1
ip address 192.168.0.1 255.255.255.0
no shutdown
exit
end
write memory
Core2 Configuration:
enable
configure terminal
hostname Core2
interface range fastethernet 0/1-24
no shutdown
exit
interface fastethernet 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/2
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/3
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface vlan 1
ip address 192.168.0.2 255.255.255.0
no shutdown
exit
end
write memory
Dist1 Configuration:
enable
configure terminal
hostname Dist1
interface range fastethernet 0/1-24
no shutdown
exit
interface fastethernet 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/2
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/3
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface vlan 1
ip address 192.168.1.1 255.255.255.0
no shutdown
exit
end
write memory
Dist2 Configuration:
enable
configure terminal
hostname Dist2
interface range fastethernet 0/1-24
no shutdown
exit
interface fastethernet 0/1
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/2
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface fastethernet 0/3
switchport trunk encapsulation dot1q
switchport mode trunk
exit
interface vlan 1
ip address 192.168.1.2 255.255.255.0
no shutdown
exit
end
write memory
Issues:
- Core1 and Core2 can ping each other successfully.
- Dist1 and Dist2 can ping each other successfully.
- Dist1 and Dist2 cannot ping Core1 or Core2.
- I’ve tried disabling port security and ACLs, but the issue persists.
Verification Commands:
- show ip interface brief
- show vlan brief
- show interface trunk
- show running-config
Observations:
- All interfaces are up and in the correct VLANs.
- Trunk links seem to be configured correctly.
- There are no ACLs blocking traffic.
Request:
I need help identifying why Dist1 and Dist2 cannot ping Core1 and Core2. Is there something wrong with my trunking configuration or VLAN setup? Any advice or troubleshooting steps would be greatly appreciated.
Thank you in advance for your help!