M A N A G E M E N T C O N S O L E
Data Device Corporation
FC-76000 Manual
www.ddc-web.com
Rev A-01/10-0
21
4.2.5.4.1 Port Speed Select
The port speed selections 1 and 2 are self explanatory and allow the two banks to be
independently configured for either 1G (1.0625 Gbps) or 2G (2.125 Gbps) speed.
The selected speed must match that of the FC equipment connected to the switch.
4.2.5.4.2 Address Mask 0 Bit Check
Selection 3 (Address Mask 0 bit Check) enables or disables the switch from checking
that the masked off bits of the DID field of a received frame are zero. If this check is
enabled the switch will NOT route frames whose masked off bits are non-zero. If this
check is disabled the switch will ignore the state of masked off DID bits. For example,
the DID bits that are 0 in Table 9 below must also be zero in a received FC frame IF
the “Address mask 0 bit check” is enabled; if “Address mask 0 bit check” is disabled
these same bit are don
‟t ca
res.
4.2.5.4.3 Lookup Mask Select
Selection 4 (Lookup Mask Select) selects which one of the four fixed lookup masks
will be applied to the DID field in the received frame. DID refers to the D_ID
(Destination Address) field in the header section of a fibre channel frame. Ten bits of
the 24 bit DID field are used as an index into the 1024 entry routing table(s). The
switch has four predefined lookup masks for selecting which 10 bits of the DID are
looked at for routing the received frame. The four lookup masks are listed in Table 9.
The bits in the DID whose corresponding mask are 1 will be used to create an index
into the routing table IF the remaining DID bits are zero (Address Mask 0 bit Check
ENABLED) or “don
‟t c
ares” (Address Mask 0 bit Check DISABLED).
For example, if the LU mask is 0 and “Address Mask 0 bit Check” is ENABLED and
the DID of a received frame is 0x030804, the frame will NOT be routed because the
Port field is non-zero (last byte of DID = 4). However, if the LU mask is 0 and
“Address Mask 0 bit Check” is DISABLED for the same received frame (DID =
0x030804), 0x308 will be extracted from the DID and used as an index into the
routing table. If the routing table has a valid entry at 0x308 the switch will attempt to
transmit that frame out the port(s) specified in the entry. The phrase “attempt” is used
because the destination port might be unconnected, the link might be down
temporarily, the buffer credits might have dropped to zero (flow control), etc..
Table 9. Look Up Mask/DID fields
LU mask
Destination
Mask
DID of received frame
Domain
Area
Port
0
DID_MASK0
00000011
11111111
00000000
2/8/0
1
DID_MASK1
00000000
00000011
11111111
0/2/8
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