Vlan – Multiple IP Addresses on VLAN Interface (SVI)

interfaceip addresssubnetvlan

Let's say that there is a SVI for VLAN 100 and it's been assigned the first usable IP address in subnet 192.168.1.0/24. There is a host on VLAN 100 with an IP address of 192.168.1.130. We need to change the subnet on the SVI to a /25, but we need to do it without causing a significant disruption to the host or changing it's IP address.

How would you do it?

Best Answer

  1. Add a secondary IP address to the SVI in the same subnet that is in your new target range.
  2. Change the the subnet mask and default gateway on the host.
  3. Promote the secondary IP address to primary with the new subnet mask and remove the old primary.
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