Failover Cable

Failover Cable

Cisco provides a admirable affection alleged failover, wherein the configuration

and operations of one firewall are mirrored to a advancement firewall.

Failover is discussed in detail in Chapter 8. Back application accepted failover

with the failover cable, it is the cable that determines which firewall is

the primary and which is the accessory assemblage in a pairing. The cable

makes this assurance based on which end is acquainted into which

firewall.

As allotment of your PIX firewall troubleshooting knowledge, you need

to apperceive the pinout arrangement acclimated by this cable. To that end, we accept provided

a abundant schematic in Figure 10.16. If failover is not working, you

need to apperceive what your cable agreement should attending like back you

analyze it with a cable tester.

Although all the affairs in the DB15 adapter at anniversary end are

important, you can see that assertive affairs are cross-connected at each

end to analyze the primary end from the accessory end. The primary

firewall is configured by cross-connecting wire 11 (local bung detect) to

wire 12 (primary select). The accessory firewall is bent by crossconnecting

wire 12 (secondary select) to wire 5 (ground). Knowing the

wiring arrangement can accredit you to not alone to analysis your failover cable

but to additionally body one from blemish if necessary.

Failover Cable Pinout

8

5

4

3

2

1

14

13

12

11

10

9

15

8

7

6

5

4

3

2

1

14

13

10

9

15

12

11

Internal Loopback

Internal Loopback

Primary Secondary

Power Dectect

Foreign Bung Detect

Receive Data

Power Source

Transmit Data

Local Bung Detect

Plug Driver

Primary Select

Ground

Secondary Select