Chassis Slot and Logical Interface Numbering
The Cisco ASR 1000 Series Routers have a slot numbering system located on both sides of the card module
location. The chassis slots are physically numbered from zero starting at the bottom of the chassis. This section
describes the slot numbering for the Cisco ASR 1000 Series Routers:
Cisco ASR 1000 Series SPA Interface Processor (SIP) subslots begin their numbering with “0” and have a
horizontal orientation. The SIP subslot numbering is indicated by a small numeric label beside the subslot on
the faceplate. Some commands allow you to display information about the SPA itself, such as show idprom
module and show hw-module subslot. These commands require you to specify both the physical location
of the SIP and SPA in the format, Slot/Subslot, where:
• Slot—Specifies the chassis slot number in the Cisco ASR 1000 Series Routers where the SIP is installed.
• Subslot—Specifies a subslot of the SIP where the SPA is installed.
• Superslots (power zone 0 and power zone 1)—Specifies the Cisco ASR 1013 Router slot spacing divided
into zones.
See the router-specific chapter for chassis slot numbering and naming descriptions.Note
MAC Address Information
The Media Access Control (MAC) or hardware address is a standardized data link layer address that is required
for certain network interface types. These addresses are specific and unique to each port and are not used by
other devices in the network. The Cisco ASR 1000 Series Routers assign and control the MAC addresses of
its shared port adapters.
You can identify shared port adapter slots by using software commands. To display information about:
•
All shared port adapter slots, use the show interfaces command.
•
A specific shared port adapter slot, use the show interfaces command with the shared port adapter type
and slot number in the format show interfaces port-adapter-type slot-number/port-number.
If you abbreviate the command (sh int) and do not specify shared port adapter type and slot number (or
arguments), the system interprets the command as show interfaces and displays the status of all shared
port adapters and ports.
Note
The MAC addresses are assigned to the slots in sequence. For example, in the Cisco ASR 1006 Router, the
first address is assigned to slot 0 and the last address is assigned to slot 6. The actual MAC address assignment
is 16 MAC addresses per SPA slot for half-height SPAs and 64 per SPA slot for full-height SPAs. Also, the
Cisco ASR 1000 Series RP1 RP Management Ethernet port is assigned one MAC address from the end of the
pool and for the Cisco ASR 1006 Router with two Cisco ASR 1000 RP1s, each ASR10000 RP1 is assigned
one MAC address.
Using this address scheme, you can remove shared port adapters and insert them into other routers without
causing the MAC addresses to move around the network or be assigned to multiple devices.
Cisco ASR 1000 Series Router Hardware Installation Guide
9
Cisco ASR 1000 Series Routers Hardware Overview
Chassis Slot and Logical Interface Numbering
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