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SmartConnect User’s Guide
BMD00082, February 2009 Chapter 3: Switch Virtualization
37
ServerMobility
The ServerMobility
™
feature allows server IP addresses to be assigned based on their physical
location in a blade server chassis. If a server fails, a replacement server can assume the identity
of the failed unit. The replacement can be a new blade server placed into the slot of the failed
unit, or it can be a backup server in another slot, that is activated to take over for the failed
server.
The ServerMobility feature uses DHCP option 82 to support fixed server address allocation.
When the switch relays a server’s DHCP request, it inserts the chassis ID, slot number, and
port number into the request, as follows:
The chassis ID is encoded in the Agent circuit ID sub-option, in hexadecimal format,
as follows:
59:49:00:c1:56:5f:11:db:a8:dd:ca:d0:a4:b3:de:4a
The slot number and port number are encoded in the Agent remote ID sub-option,
in hexadecimal format. The following example shows how Slot 1 and Port Number 2 are
configured in the Agent remote ID:
01:0:0:0:02
The DHCP server must be configured to supply a reserved IP address for each server, based on
the option 82 information.
Note – The ServerMobility feature operates independently of the SmartConnect features that
may be installed on the chassis. ServerMobility should not be enabled on the switch if Smart-
Connect server failover features have already been enabled on the chassis management system.
Configuring a Backup Server Port
If one server is configured as the backup to another server, the administrator may wish the two
servers to use the same IP address, even though they are in different slots. To address this
issue, configure a port as the backup port of another (active) port on the switch. The agent
remote ID sub-option for packets received on the backup port will use the port number of its
active port. If the active server goes down, the backup server will receive the same IP address
as the active server.
The following configuration guidelines apply to ServerMobility backup ports:
Both the active port and the backup port must have the ServerMobility feature enabled.
The active port and the backup port must be in the same VSG.