Reference Guide

Fabric Services | 439
FC-ID: 24-bit port address. Consists of three parts:
• Domain: Address of the switch itself. There are only 239 addresses actually available for switches in
your SAN environment. The domain number allows each switch to have a unique identifier if you have
multiple interconnected switches in your environment.
• Area: Identifies a group of F_Ports. Each group of ports has a different area number, even if there is
only one port in the group.
• Port: Provides 256 addresses for identifying attached N_Ports and NL_Ports.
The following sequence explains the operation for the attached N_Port:
• N_Port sends a Fabric Login (FLOGI) as it requests a unique 24-bit address from the Fabric Login
Server.
• N_Port sends FLOGI to address 0xFFFFFE. Upon success, it obtains a valid address (FCID).
• N_Port sends a Port Login (PLOGI) to inform the Fabric Name Server of its personality and
capabilities, this includes WWNN, WWPN.
• N_Port sends PLOGI to address 0xFFFFFC to register this address with the name server.
Table 22-1. Display Name Server information
The following configurations are applicable only after configuring the switch mode to fabric services using
the
fc switch-mode fabric-services command. When the switch mode is set to fabric services, Fibre Channel
interfaces are set to shutdown and the
fcoe-map "default_full_fabric” is applied. Any previously configured
fcoe-map is removed and the
fcoe-map "default_full_fabric” cannot be removed from the Fibre Channel
interfaces.
Link State Database
The collection of neighbor, connected ports and cost of all the switches in a Fabric constitutes the link-state
database (LSDB).
show fc ns switch (Figure 22-10) Displays the local name server entries
show fc ns switch brief (Figure 22-11) Displays the local name server entries - brief version
show fc ns fabric (Figure 22-12) Displays the fabric name server entries
show fc ns fabric brief (Figure 22-13) Displays the fabric name server entries - brief version
show fc topology (Figure 22-21) Displays the topology information of the local switch
Table 22-2. LSDB Record
SwitchName WWN of a switch on the fabric.
PortOut Port number on the local switch that would be used to route a frame to the
named switch.
Hops The number of links between the local switch and the named switch.
Cost The overall link cost (in time) between the local switch and the named
switch. Cost is a function of hops and link speed