After configuring a Shortel ST1D switch, I connected the LAN1 Port from Shoretel ST1D to my Cisco 4507R switch. I attempted to ping the IP that I set specifically on the ST1D switch and I wasn't able to reach that IP.


-I ran a show mac address-table | i on the port that I plugged into and found the mac address.

-I took that and ran a show arp | i *mac address* and found that the new Shoretel ST1D switch registered with a completely different IP assigned by DHCP.

-I found out right after that we have a DHCP server sitting behind that switch which would hand out IP's to whatever device connects to that switch.

My question is, why would DHCP assign an IP even though I specifically directed the Shoretel switch to assign that particular IP to itself? Why would DHCP take priority over a static IP address?

--A side note, I checked to make sure the static IP that is on the shoretel switch configuration was not taken by any other device prior to plugging into the Cisco 4507R switch.--

Here is the Shoretel switch configuration if it helps:

Current system configuration:
 DHCP                    = enabled
 FTP user name           = anonymous
 FTP password            = tskl
 Ethernet address        = 00:10:49:X:X:X -omitted-
 Service IP address      =
 IP subnet mask          =
 Server IP address       =
 Controlling Server IP address =
 Gateway IP address      =
 Image Server address    =
 DNS IP address          =
 Time server IP address  = 0.shor.pool.ntp.org 1.shor.po
 Ethernet link set       = no link
 Ethernet link requested = automatic
 Domain name             =

1 Answer 1


On the very first line of the configuration, you have DHCP enabled, so the switch will configure itself via DHCP:

Current system configuration:
 DHCP                    = enabled

If you want to statically assign the switch address, then you should disable DHCP on the switch.

  • Thanks Ron. Sometimes the most obvious things are staring right at you. lol
    – Craken
    May 10, 2019 at 0:20
  • That happens to all of us. Fortunately, you provided enough information to be able to see the problem.
    – Ron Maupin
    May 10, 2019 at 0:22

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