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Card Numbering and Interface Addressing
The router uses a card numbering scheme to identify cards in the chassis, and an interface
addressing scheme to identify the ports (interfaces) on each card. Each Multibus interface card and
the ciscoBus controller card have a unique card number that you set with switch S1 on the card.
Table 5 shows the switch settings (S1) on the ciscoBus controller cards. All four pins are in the down
(off) position when the ciscoBus controller is viewed from the front edge of the card (viewed as
installed in the card cage). The system processor uses card numbers to assign interface addresses to
the ports on each card and to control traffic across the Multibus. The ciscoBus controller card
controls the traffic between the Multibus and all ciscoBus cards, so it is the only ciscoBus card that
needs a card number. The card number of the ciscoBus controller is always 0, which is the factory
default. No Multibus cards can be set for card number 0.
Table 5
Card
No.
0
At startup, the system polls each Multibus interface card, beginning with the lowest card number,
and assigns a sequential interface address to each port (interface) on each card. When all Multibus
interfaces are assigned, the system proceeds to the ciscoBus and continues the interface address
sequence as it polls the ciscoBus cards according to the ciscoBus slot priority. (For information on
slot priority, refer to the section "Slot Priority" on page 11.)
Table 6 is an example of how the system assigns Ethernet interface addresses in a chassis with one
CSC-MCI 2E2T card and two CSC-MEC6 cards. The CSC-MCI is a Multibus card, and the
CSC-MEC is a ciscoBus card; therefore, the CSC-MCI interface addresses are assigned first.
Table 6
Card
First CSC-MCI
Second CSC-MCI
First CSC-MEC
Second CSC-MEC
ciscoBus Controller Switch Settings for Card Numbering
S1-1
S1-2
S1-3
S1-4
off
off
off
off
Multibus and ciscoBus Interface Addressing Example
Card Port No.
Port 0
Port 1
Port 0
Port 1
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Port 0
Port 1
Port 2
Port 3
Port 4
Port 5
Installing the CSC-MEC and CSC-C2MEC Multiport Ethernet Controller Cards 13
Interface Address Assigned
Ethernet 0
Ethernet 1
Ethernet 2
Ethernet 3
Ethernet 4
Ethernet 5
Ethernet 6
Ethernet 7
Ethernet 8
Ethernet 9
Ethernet 10
Ethernet 11
Ethernet 12
Ethernet 13
Ethernet 14
Ethernet 15
Installation Prerequisites
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