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