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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 5 Software Upgrade Processes Supported by Cisco ASR 1000 Series Routers
Minimal Disruptive Restart ISSU
Effective from Cisco IOS XE Release 3.12S, the Cisco ASR 1000 Series Fixed Ethernet Line Card
(ASR1000-2T+20X1GE) supports Minimal Disruptive Restart (MDR) for ELCBase and ELCSPA
packages. MDR support for ASR1000-2T+20X1GE is specifically available on the Cisco ASR 1006
Router and the Cisco ASR 1013 Router with Route Processor 2 (RP2).
For more information on the Cisco ASR 1000 Series Fixed Ethernet Line Card (ASR1000-2T+20X1GE),
see the following documents:
Cisco ASR 1000 Series Fixed Ethernet Line Card Hardware Installation Guide
Cisco ASR 1000 Fixed Ethernet Line Card Software Configuration Guide
Use the request platform software package verify and issu checkversion commands with the mdr
option to verify the MDR upgrade compatibility of a consolidated package or an individual subpackage.
When performing an ISSU upgrade, you can specify whether the upgrade should use MDR. If you do
not specify this, the ISSU upgrade process will remain unchanged.
For more information on ISSU upgrade for nonredundant platforms, see “Upgrade Process with Service
Impact for Nonredundant Platforms” section on page 5-74.
Restrictions and Limitations
• MDR is not supported on non-hardware-redundant platforms, such as, Cisco ASR 1001 Router,
Cisco ASR 1001-X Router, Cisco ASR 1002 Router, Cisco ASR 1002-X Router, or Cisco ASR 1004
Router, and on hardware-redundant platforms without redundant hardware, such as, Cisco ASR
1006 router, or Cisco ASR 1013 router with only a single RP or ESP.
• MDR is not supported on SIP10.
• MDR does not support software downgrade.
• To use MDR, both the current software and the upgrade software must be ISSU and MDR
compatible.
• If a SIP is performing an MDR upgrade the following events cannot be handled during the upgrade:
–
Fast Reroute (FRR)
–
Automatic protection switching (APS)
–
Ethernet over Multiprotocol Label Switching (EoMPLS) and pseudoWire (PW) down that
require an attachment circuit (AC) port to be shut.
–
Interface flaps and interface errors
–
Interface-specific or linecard-specific configuration changes
–
SPA Online Insertion and Removal (OIR)
–
Transceiver OIR
–
Line alarms
–
Statistics—Error counts will be reset
High-Availability Considerations
Any high-availability (HA) failover that occurs during MDR-process terminates the process. This
includes failures such as active RP IOS failover during the MDR upgrade process or active RP FRU
failure in a chassis with redundant hardware during subpackage upgrade.