Updated: August 14, 2017
Revision: 001

 

Synopsis:

VRRP feature - Session Sync issue:

An issue with session sync was introduced in 4.1.1. The session sync may fail between legacy software versions (e.g., 2.7.x, 2.8.x, 4.1.0-PX and older) when migrating to the first 3 versions of 4.1.1 software (i.e. 4.1.1, 4.1.1-P1and 4.1.1-P2), and this could cause the standby ACOS device to reload during the upgrade process.

 

Affected Software Releases:

4.1.1, 4.1.1-P1, and 4.1.1-P2

 

Workaround:

For ADC and CFW: The best option is to upgrade older code to 4.1.1-P3 and above.
For CGN: The best option is to upgrade to 4.1.2 and above.

Code sets:

Set 1: 2.7.x, 2.8.x, 4.1.0(PX)
Set 2: 4.1.1, 4.1.1-P1, 4.1.1-P1-SP1, 4.1.1-P2
Set 3: 4.1.1-P3 and above, 4.1.2 and above

Detailed upgrade path:

Set 1 to Set 1, no issues with session sync
Set 1 to set 2, you must isolate the device and upgrade each box individually then reestablish HA again.
Set 2 to set 2, no issues with session sync.
Set 2 to set 3, you must isolate the device and upgrade each box individually then reestablish HA again.
Set 1 to set 3, no issues with session sync.

The left column represent the code you will upgrade From: , and the top row is the code you will upgrade To:

  2.7.x 2.8.x 4.1.0-Px 4.1.1 4.1.1-P1 4.1.1-P1-SP1 4.1.1-P2 4.1.1-P3+ 4.1.2+
2.7.x ok ok ok BSS BSS BSS BSS ok ok
2.8.x   ok ok BSS BSS BSS BSS ok ok
4.1.0-Px     ok BSS BSS BSS BSS ok ok
4.1.1         ok ok ok BSS BSS
4.1.1-P1           ok ok BSS BSS
4.1.1-P1-SP1             ok BSS BSS
4.1.1-P2               BSS BSS
4.1.1-P3+               ok ok
4.1.2+                 ok

 

Ok = no session sync issue. Upgrade via the prescribed path forward found in the SW release notes.

BSS = must break session sync, i.e. you must isolate the device and upgrade each box individually then reestablish HA again.

 

Resolution Statement:

This bug has been resolved on 4.1.1-P3 and above for ADC and CFW.

This bug has been resolved on 4.1.2 and above for CGN