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Cisco ASR 1000 Series Aggregaion Services Routers Hardware Installation and Initial Configuration Guide
OL-13208-03
Chapter 1 Cisco ASR 1000 Series Routers Hardware Overview
Functional Overview
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.
Note Storing the MAC addresses for every slot in one central location means the addresses stay with the
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.
Note As you disengage the shared port adapter from the router, online insertion and removal (OIR)
administratively shuts down all active interfaces in the shared port adapter.
Online insertion and removal (OIR) 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.
Note The Cisco ASR 1002 Router differs from the Cisco ASR 1006 and Cisco ASR 1004 routers. The Cisco
ASR
1002 Router supports the Cisco embedded ASR1000-RP1 which is a combined route processor and
carrier card which are not field-replaceable units. The Cisco ASR1000-ESP5 or ASR1000-ESP10 are
field-replaceable units.
The following is a functional description of OIR for background information only; for specific
procedures for installing and replacing a shared port adapter in Cisco ASR 1000 Series Routers, refer to
the online configuration note for each shared port adapter.
When you remove or insert a shared port adapter in a Cisco ASR 1000 Series Router, the Control
Processor notifies the Cisco ASR1000-RP1, which in turn notifies the forwarding engine control
processor (FECP), and then performs as follows:
• Rapidly scans the midplane for configuration changes.
• Initializes all newly inserted shared port adapters, noting any removed interfaces and placing them
in the administratively shutdown state.
• Brings all previously configured interfaces on the shared port adapter back to the state they were in
when they were removed. Any newly inserted interfaces are put in the administratively shutdown
state, as if they were present (but not configured) at boot time. If a similar shared port adapter type
is reinserted into a slot, its ports are configured and brought online up to the port count of the
original SPA.