Configuring Fc Routing And Forwarding; Overview; Routing Table And Fib Table - HP FlexFabric 5700 Series Configuration Manual

Configuring FC routing and forwarding

Overview

Routing and forwarding in an FC SAN is achieved through FCF switches. When an FCF switch receives
a packet, an FCF switch performs the following operations:
• Selects an optimal route based on the destination address.
Forwards the packet to the next FCF switch in the path until the packet reaches the last FCF switch.
•
The last FCF switch forwards the packet to the destination node.
Routing provides the path information that guides the forwarding of packets.

Routing table and FIB table

An FCF switch determines the best routes by using its routing table and sends those routes to the FIB table,
which guides packet forwarding. An FCF switch maintains one routing table and one FIB table for each
VSAN.
Routing table contents
The routing table saves the routes discovered by various routing protocols. Routes in a routing table
include the following types:
• Direct routes—Routes discovered by link layer protocols.
Static routes—Routes manually configured by the administrator.
•
FSPF routes—Routes discovered by the Fabric Shortest Path First (FSPF) protocol.
•
To display brief information about a routing table, use the display fc routing-table command as follows:
<Sysname> display fc routing-table vsan 1
Routing Table: VSAN 1
Destinations : 6
Destination/mask
0x020000/8
0x120000/8
0xfffc01/24
0xfffffa/24
0xfffffc/24
0xfffffd/24
...
A route entry includes the following key items:
Destination—Destination address of an FC frame.
•
• mask—Together with the destination address, specifies the domain address of the destination node
or FCF switch. A logical AND operation between the destination address and the network mask
yields the domain address of the destination node or FCF switch. For example, if the destination
address is 0x010001 and the mask is 0xFF0000, the domain address of the destination node or
Routes : 6
Protocol Preference
FSPF 20
STATIC 10
DIRECT 0
DIRECT 0
DIRECT 0
DIRECT 0
52
Cost Interface
265 Vfc1
0 Vfc2
0 InLoop0
0 InLoop0
0 InLoop0
0 InLoop0