VIP Port Adapter Functions
Figure 22 shows some of the slot port adapter and interface ports of a sample Cisco 7505 system. For example, on a FE-TX/FE-TX VIP in slot 3, the address of the first Fast Ethernet port adapter is 3/0/0 (chassis slot 3, port adapter slot 0, and interface port 0), and the address of the second Fast Ethernet port adapter is 3/1/0 (chassis slot 3, port adapter slot 1, and interface port 0).
The individual port adapter numbers are always 0 and 1. The individual interface port numbers always begin with 0. For example, the FE-TX port adapters in the first and second port adapter slots in chassis slot 3 would have the following addresses: 3/0/0 and 3/1/0. The number of additional ports depends on the number of ports on a port adapter.
Note If you remove the VIP from slot 3 and install it in slot 2, the addresses of those same ports become 2/0/0 and 2/1/0.
Figure 22 Fast Ethernet Interface Port Number Example (Cisco 7505 Shown)
3/0/0 (FE-TX port adapter)
NORMAL
ENABLE 
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| ROUTE SWITCH PROCESSOR |
EJECT | SLOT | 1 |
| CPU | RESET |
| CONSOLE | |
| 0 |
| AUX | |||||
| SLOT |
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| LINK | ETHERNET 10BT | |
0 | 1 | 2 | 3 |
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| 1 | 3 |
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| 0 | 2 |
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H5922
Slot 3 |
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Slot 2 | Interface |
Slot 1 | processor |
slots | |
Slot 0 |
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Note: The MII and
You can identify interface ports by physically checking the slot/port adapter/interface port location on the back of the router or by using software commands to display information about a specific interface or all interfaces in the router.
To display information about a specific interface, use the show interfaces command with the interface type and port address in the format show interfaces [type slot/port adapter/port].
Following is an example of how the show interfaces command displays status information (including the physical slot and port address) for the interface you specify. In this example, most of the status information for each interface is omitted, and a Fast Ethernet interface in slot 3 is used.
Router# sh int fa 3/0/0
FastEthernet3/0/0 is administratively down, line protocol is down
Hardware is cyBus FastEthernet Interface, address is 0000.0ca5.2380 (bia 0000) MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, rely 255/255, load 1/255 Encapsulation ARPA, loopback not set, keepalive set (10 sec), hdx, 100BaseTX
(display text omitted)