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Software Configuration Guide—Release IOS XE 3.6.0SG and IOS 15.2(2)SG
OL-30933-01
Chapter 6 Configuring the Cisco IOS In-Service Software Upgrade Process
Performing the ISSU Process
Dynamic(0) was introduced in Cisco IOS Release 12.2(50)SG with the Dynamic Image Version
Compatibility (DIVC) feature. With DIVC, Dynamic(0) is stored instead of Incomp(1), Base(2), or
Comp(3). Compatibility is determined during runtime when two different DIVC-capable images are
running in the active and standby supervisor engines during ISSU.
For Catalyst 4500 switches, a value of Dynamic(0) in the stored compatibility-matrix normally results
in Base(2) or Comp(3) upon rollback negotiation between the two images. You never observe Incomp(1)
as long as the other image name is present in the stored compatibility matrix.
Displaying ISSU Compatibility Matrix Information
The ISSU compatibility matrix contains information about other IOS XE software releases and the
version in question. This compatibility matrix represents the compatibility of the two software versions,
one running on the active and the other on the standby supervisor engine, and the matrix allows the
system to determine the highest operating mode it can achieve. This information helps the user identify
whether to use ISSU.
This task shows how to display information about the ISSU compatibility matrix:
This example shows how to display negotiated information regarding the compatibility matrix:
Switch> enable
Switch# show issu comp-matrix negotiated
CardType: WS-C4507R-E(182), Uid: 4, Image Ver: 03.00.00.1.68
Image Name: cat4500e-UNIVERSALK9-M
Cid Eid Sid pSid pUid Compatibility
=======================================================
2 1 131078 3 3 COMPATIBLE
3 1 131100 5 3 COMPATIBLE
4 1 131123 9 3 COMPATIBLE
.....
.....
Command or Action Purpose
Step 1
Switch> enable
Enables privileged EXEC mode. Enter your password if
prompted.
Step 2
Switch# show issu comp-matrix
{negotiated | stored | xml}
Displays information regarding the ISSU compatibility
matrix.
• negotiated—Displays negotiated compatibility matrix
information.
• stored—Displays negotiated compatibility matrix
information
.
• xml—Displays negotiated compatibility matrix
information in XML format.
Note These commands display only the data within IOSd
process. Use the show package compatibility to
display the information for the whole system.
Step 3
Switch# show package compatibility
Displays information regarding all client compatibility in
the system.
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