Cisco Systems 8600 Series manual Hot Standby Backup, AIS cells

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

LOS or root down

Trunk failure

root

BME

AIS cells

AIS cells

leaf 1

leaf 2

BPX Switch 1 BPX Switch 2 BPX Switch 3

12143

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.

10-8Cisco BPX 8600 Series Reference