Home Lab Gear: Cisco SG300-10 Layer 3 switch gets even better

Home Lab Gear: Cisco SG300-10 Layer 3 switch gets even better

This is a guest post by Andy Grant.

Vladan has previously covered this great little SMB switch from Cisco in his post My homelab – The Network design with Cisco SG 300 – a Layer 3 switch for €199.

Cisco has just released the long awaited firmware revision version 1.1.  Notable improvements include Cisco Discovery Protocol (CDP) support and a full CLI.

For those of you who are not familiar with CDP, it provides network topology information to connected devices.   This can be greatly beneficial to determine what port a VMNIC is connected to on the switch.

The CDP information is displayed by clicking the little information box beside the physical adapter when browsing the network configuration of a host.

By default, all vSwitches are set to listen for CDP messages.  This provides a one-way street for determining network topology.  vSphere does support listening and advertising CDP messages.

To determine the current CDP setting:

TSM/COS: esxcfg-vswitch -b  vSwitch0

vMA: vixcfg-vswitch -b  vSwitch0



To enable both listen and advertise:

TSM/COS: esxcfg-vswitch -B both  vSwitch0

vMA: vixcfg-vswitch -B both  vSwitch0

After enabling CDP “both” on the vSwitch, the SG300 will provide the following:








Review the release notes and known issues before updating.  Full changelog here https://supportforums.cisco.com/docs/DOC-17092

Happy labbing :)

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