Hi,
I'm trying to configure a trunk link between a Cisco C3550 (FastEthernet) and a C2960G (Gigabit) Catalyst switch, but I'm having issues. We have 5 subnets in our network infrastructure:
Subnet1: 172.16.0.0 255.255.255.192 - Production Mgmt Servers/devices
Subnet2: 192.168.0.0 255.255.255.0 - Production virtual servers
Subnet3: 172.16.0.64 255.255.255.192 - DR Mgmt Servers/devices
Subnet4: 192.168.100.0 255.255.255.0 - DR virtual servers
Subnet5: 192.168.1.0 255.255.255.0 - PCs/Laptops
The switch IPs are:
Prod-SW-01: 172.16.0.1
DR-SW-01: 172.16.0.65
I have configured 4 VLANs on each switch:
int vlan 100
int vlan 101
int vlan 200
int vlan 201
On the C2960G (Prod-SW-01), I have configured the downlink port as follows:
interface GigabitEthernet1/0/24
description Trunk to DR-SW-01
switchport trunk allowed vlan 100,101,200,201
switchport mode trunk
speed 100
duplex full
On the C3550 (DR-SW-01), I have configured the uplink port as follows:
interface FastEthernet1/0/24
description Trunk to Prod-SW-01
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100,101,200,201
switchport mode trunk
speed 100
duplex full
From the C3550 switch (DR-SW-01), I can ping devices on VLAN 100 and 101.
From the C2960G on VLAN 100, I can ping telnet to the switch, but cannot ping any directly connected device on VLAN200 (172.16.0.64/26).
The only thing I can see that's different is that the C3550, being an older switch prompts me to configure a VLAN encapsulation type when I attempt to make a port a trunk. The C2960G does not require this. I'm not sure if this is the problem!
Any ideas how I should go about this, change this or troubleshoot this?
Thanks,
Fin