Enable an Existing IP Interface

If the IP address for an existing IP interface is changed, the change to the address is treated as a deletion of one of the management addresses and an addition of a new management address by LLDP. Note that in the following instructions, VLAN 2 is configured with IP address 15.0.0.1 and is enabled for the extreme-ethernet interface 0/1.

1. At switch 1, change the IP address of VLAN 2 to 16.0.0.1:

   SEFOS# configure terminal
   SEFOS(config)# interface vlan 2
   SEFOS(config-if)# shutdown
   SEFOS(config-if)# ip address 16.0.0.1 255.255.255.0
   SEFOS(config-if)# no shutdown
   SEFOS(config-if)# end

   The following list describes the impact of the change in the IP address:

   • The entry corresponding to the old IP address of VLAN 2 is deleted from the LLDP management address table.

   • The entry corresponding to 16.0.0.1 is created.

   • The TLV transmission status of 16.0.0.1 is disabled by default.

2. Review the IP addresses that are configured for the system and TLV transmission status of the addresses.

   SEFOS# show lldp local mgmt-addr
   Management Address            TxEnabledPorts
   ------------------            --------------
   12.0.0.1                    Ex0/1
   16.0.0.1

   The TxEnabledPorts value for management address 16.0.0.1 does not display any interfaces. The newly configured IP address 16.0.0.1, has not advertised through extreme-ethernet interface, Ex0/1, and the entry corresponding to IP address 15.0.0.1 was deleted from the remote table.

3. At switch 2, review the learned neighbor information on the interface.

   SEFOS# show lldp neighbors extreme-ethernet 0/1 detail
   ...
   Management Addresses        :
   IfId        SubType    Address        OID
   ----        -------    -------        ---
   1009        IPv4        12.0.0.1        1 3 6 1 2 1 2 2 1 1
   ...

   The entry corresponding to IP address 15.0.0.1 was removed from the list of management addresses.