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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
Minimal Disruptive Restart ISSU
A software upgrade of a SIP in any mode results in the SIP being reset and the occurrence of minimal
outage during the upgrade. Minimal Disruptive Restart (MDR) minimizes traffic disruption during a
software upgrade and supports consolidated package software upgrade and subpackage software upgrade
for SIP-40.
The software upgrade of a SIP using MDR is supported only on the Cisco ASR 1000 Series Aggregation
Services routers running Cisco IOS XE Release 3.8S and later.
Note MDR upgrades (both consolidated and subpackage upgrades) are supported only on hardware-redundant
dual route processor (RP) and Enhanced Services Processors (ESP) platforms.
MDR reduces the downtime (time during which the data plane is unavailable) due to ISSU of a SIP and
the SPA(s) within it. The downtime is reduced from 100 seconds to not more than 25 seconds on a SIP
reload and from 30 seconds to not more than 10 seconds on a SPA reload. The reload time of a SIP or
SPA using a MDR or a non-MDR upgrade remains the same.
MDR for a SIP is permitted if following conditions are met:
• Chassis is hardware redundant (dual RP and dual ESP)
• SIP-type supports MDR.
• At least one MDR-compatible SPA in the SIP should be present for the MDR process.
• All the SPAs associated with the SIP support MDR.
• Both the current software version and the upgrade software version must be ISSU and MDR
compatible for both the SIPBase and SIPSPA subpackages for each SPA type that is present.
The following SPAs support MDR:
–
SPA-2X1GE-V2
–
SPA-5X1GE-V2
–
SPA-8X1GE-V2
–
SPA-10X1GE-V2
–
SPA-1X10GE-L-V2
Starting with IOS XE release 3.10S and later, MDR support has been extended to include the
following SPAs:
–
SPA-2XOC3-POS
–
SPA-4XOC3-POS
–
SPA-4XOC3-POS-V2
–
SPA-8XOC3-POS
–
SPA-1XOC12-POS
–
SPA-2XOC12-POS
–
SPA-4XOC12-POS
–
SPA-8XOC12-POS