The above diagram shows a small sample network with the stack of Catalyst 3750s providing inter−VLAN
routing between the various segments.
The following are the three user defined VLANs:
VLAN 2 − user VLAN• VLAN 3 − server VLAN• VLAN 10 − management VLAN•
The default gateway configured on each server and host device should be the corresponding VLAN interface
IP address on the stack of 3750s. For example, for servers, the default gateway is 10.1.3.1. The Catalyst 2950
is trunked to the top Catalyst 3750 switch (stack master) and the Catalyst 2848G is trunked to the bottom
Catalyst 3750 switch (stack member).
The default route for the stack is pointing to the Cisco 7200VXR router. The stack of 3750s uses this default
route to route traffic destined for the Internet. Therefore, traffic for which the 3750s does not have a routing
table entry is sent to the 7200VXR for proccessing.
Practical Tips
In this diagram, the management VLAN is separate from the user or server VLAN. This VLAN is
different from the user or server VLAN. This is done to prevent the management of switches from
being affected by potential broadcast/packet storms in the user or server VLAN.
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Cisco − Configuring Inter−VLAN Routing with Catalyst 3750 Series Switches in a Stacked Configuration