3com 2500 Quick Setup Guide
FDDI Modules
4-21
Figure 4-21 Dual Homing a CoreBuilder™ 2500 System
, the dual-homed device has
two connections to the primary ring: A-to-M and
B-to-M. When a device has connections using both
the A and B ports, the B precedence rule takes
effect. This rule states that if a connection exists
from both the A and B ports to the M ports, the B
port always takes precedence and becomes the
active link. If the connection using the B port fails,
the A port is automatically triggered to become the
active link.
B-to-M. When a device has connections using both
the A and B ports, the B precedence rule takes
effect. This rule states that if a connection exists
from both the A and B ports to the M ports, the B
port always takes precedence and becomes the
active link. If the connection using the B port fails,
the A port is automatically triggered to become the
active link.
Using an Optical Bypass Switch with the
CoreBuilder 2500 System
CoreBuilder 2500 System
shows an optical bypass switch
configuration. Here, the fiber optic cables installed
on the optical bypass switch are connected to the
A and B ports of the CoreBuilder system. The
power/control cable is then connected to the
optical bypass interface on the FDDI module. The
FDDI dual ring is attached to the MIC receptacles on
the optical bypass switch.
on the optical bypass switch are connected to the
A and B ports of the CoreBuilder system. The
power/control cable is then connected to the
optical bypass interface on the FDDI module. The
FDDI dual ring is attached to the MIC receptacles on
the optical bypass switch.
Figure 4-22 Optical Bypass Switch Configuration
The optional optical bypass switch, available from
3Com, provides A and B MIC connectors and a
power connector.
3Com, provides A and B MIC connectors and a
power connector.
A
A
A
B
A
B
SAS
SAS
server
server
Dual-homed
node
CoreBuilder
2500
Standby link set by SMT
configuration policy
configuration policy
Concentrator
#1
CoreBuilder™
6000
FDDI
dual
ring
Concentrator
#2
CoreBuilder
6000
Active link
M
M
M
B
B
M
M
M
M
B
A
Optical bypass switch
FDDI
dual
ring
MIC
receptacles
Power/control cable
CoreBuilder™
2500
system
A
A
B
B
FDDI module