Example Of Subnet Routing - Lenovo RackSwitch G8264CS Application Manual

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Example of Subnet Routing

Consider the role of the G8264CS in the following configuration example:

Figure 40. Switch‐Based Routing Topology

Server subnet 1:

100.20.10.2-254

The switch connects the Gigabit Ethernet and Fast Ethernet LAGs from various

switched subnets throughout one building. Common servers are placed on another

subnet attached to the switch. A primary and backup router are attached to the

switch on yet another subnet.

Without Layer 3 IP routing on the switch, cross‐subnet communication is relayed

to the default gateway (in this case, the router) for the next level of routing

intelligence. The router fills in the necessary address information and sends the

data back to the switch, which then relays the packet to the proper destination

subnet using Layer 2 switching.

With Layer 3 IP routing in place on the switch, routing between different IP

subnets can be accomplished entirely within the switch. This leaves the routers free

to handle inbound and outbound traffic for this group of subnets.

Default router:

Server subnet 2:

131.15.15.2-254

Server subnet 3:

206.30.15.2-254

Chapter 22: Basic IP Routing