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10-8 Cisco BPX 8600 Series Reference
Hot Standby Backup
AIS cells
AIS cells are automatically generated on the leaves, as shown in Figure 10-7, when:
• There is a loss of signal (LOS) on the far end of the root
• There is a trunk failure
• When the root connection is downed using the dncon command.
Figure 10-7 Alarms
Hot Standby Backup
BME cards can be set up to provide hot standby backup. Both cards are set up with port 1 connected
to port 2 on the same card to provide the multicasting connection, transmit to receive and receive to
transmit. There is no Y-cabling connection between the cards, and they do not have to be adjacent to
each other.
The addyred command is used to enable hot standby backup between the cards. The addyred
command must be used before any connections are added to the active card. The command will be
rejected if used after connections have been added to the active card.
BPX Switch 1 BPX Switch 2 BPX Switch 3
root
BME
12143
leaf 1
leaf 2
AIS cells
AIS cells
LOS or
root down
Trunk
failure