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Chapter 1
Cisco ASR 1000 Series Routers Hardware Overview
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If you abbreviate the command (sh int) and do not specify shared port adapter type and slot number (or
Note
arguments), the system interprets the command as show interfaces and displays the status of all shared
port adapters and ports.
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.
If the MAC addresses were stored on each shared port adapter, online insertion and removal would not
function because you could never replace one shared port adapter with an identical one; the MAC
addresses would always be different. Also, each time a shared port adapter was replaced, other devices
on the network would have to update their data structures with the new address. If the other devices did
not update quickly enough, the same MAC address could appear in more than one device at the same
time.
Storing the MAC addresses for every slot in one central location means the addresses stay with the
Note
memory device on which they are stored.
Online Insertion and Removal
In the modular chassis configurations, most Cisco ASR 1000 Series Router field-replaceable units
(FRUs) support online insertion and removal (OIR). However, the removal of critical non-redundant
FRUs will result in service interruption.
As you disengage the shared port adapter from the router, online insertion and removal (OIR)
Note
administratively shuts down all active interfaces in the shared port adapter.
Online insertion and removal (OIR) feature allows you to install and replace shared port adapters while
the router is operating; you do not need to notify the software or shut down the system power, although
you should not run traffic through the shared port adapter you are removing while it is being removed.
Online insertion and removal is a method that is seamless to end users on the network, maintains all
routing information, and preserves sessions.
All SPA OIR events are independent of one another. An OIR event of a single SPA does not affect the
other SPAs in that ASR1000-SIP10 or any other system function.
The following items describe the OIR differences between the Cisco ASR 1002 Router, the Cisco
ASR 1002-F Router, and the Cisco ASR 1002-X Router:
OL-13208-11
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.
Cisco ASR 1000 Series Aggregation Services Routers Hardware Installation Guide
Functional Overview
1-9
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