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Chapter 1
Overview
Cisco 7401ASR Router Interface Addresses
In the Cisco 7401ASR router, only one slot accepts port adapters and it is numbered as slot 1. See
Figure
The interface address is composed of a two-part number in the format
port-adapter-slot-number/interface-port-number. See
installed in a Cisco 7401ASR router, the interface address would be 1/0. If a dual-port PA-2E3 is
installed in a Cisco 7401ASR router, the interface addresses would be 1/0 and 1/1.
Cisco 7000 Series Routers and Cisco 7500 Series Routers VIP Interface
Addresses
In Cisco 7000 series routers and Cisco 7500 series routers, port adapters are installed on a versatile
interface processor (VIP), which installs in interface processor slots 0 through 12 (depending on the
number of slots in the router). The port adapter can be installed in either bay (port adapter slot 0 or 1)
on the VIP. See
The interface address for the VIP is composed of a three-part number in the format
interface-processor-slot-number/port-adapter-slot-number/interface-port-number. See
The first number identifies the slot in which the VIP is installed (slot 0 through 12, depending on the
number of slots in the router).
The second number identifies the bay (port adapter slot) on the VIP in which the port adapter is installed
(0 or 1). The bays are numbered from left to right on the VIP.
The third number identifies the physical port number (interface port number) on the port adapter. The
port numbers always begin at 0 and are numbered from left to right. The number of additional ports
depends on the number of ports on the port adapter. The PA-E3 is a single-port port adapter, therefore
the port is always 0. The PA-2E3 is a dual-port port adapter, therefore the port can be 0 or 1.
For example, if a single-port PA-E3 is installed in a VIP in interface processor slot 3, port adapter slot 1,
the interface address would be 3/1/0 (interface processor slot 3, port adapter slot 1, and interface 0). If
a dual-port PA-2E3 is installed in a VIP in interface processor slot 3, port adapter slot 1, the interface
addresses would be 3/1/0 and 3/1/1 (interface processor slot 3, port adapter slot 1, and interfaces 0 and
1).
Although the processor slots in the seven-slot Cisco 7000 and Cisco 7507 chassis and the thirteen-slot
Note
Cisco 7513 and Cisco 7576 chassis are vertically oriented and those in the five-slot Cisco 7010 and Cisco
7505 chassis are horizontally oriented, all Cisco 7000 series routers and Cisco 7500 series routers use
the same method for slot and port numbering.
OL-3502-04
1-12.
Figure
1-17, and
Table
Figure
1-18.
PA-E3 Serial Port Adapter Installation and Configuration
Identifying Interface Addresses
1-2. For example, if a single-port PA-E3 is
Table
1-2.
1-19
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