B-5
Installation and Upgrade Guide for Cisco Unified Presence Release 8.0 and 8.5
Appendix B Upgrading Cisco Unified Presence
How to Perform Intercluster Upgrades
Roster Migration for Intercluster Upgrade
When you turn on the Cisco UP Presence Engine on the local publisher node and the remote publisher
node, Cisco Unified Presence migrates the remote contact information to the local cluster (roster
migration), and reestablishes the presence subscriptions with remote contacts in both the local and
remote cluster.
To allow Cisco Unified Presence to reestablish the presence subscriptions with remote contacts in both
the local and the remote cluster, you must reestablish the intercluster router to router connections (by
restarting the Cisco UP XCP Router)
before
you turn on the Cisco UP Presence Engine. Until the roster
migration is complete, local users will not see the availability status of remote contacts, and remote
contacts will not see the availability of their contacts belonging to the local cluster.
Note
Cisco Unified Presence does not automatically start the roster migration immediately after you
reestablish the intercluster router to router connections. Therefore, if you do not follow the sequence
described here, and manually turn on the Cisco UP Presence Engine
after
you restart the Cisco UP XCP
Router, it may take up to one day for Cisco Unified Presence to reestablish the presence subscriptions to
remote contacts in both the local and remote clusters. If this presence subscription interval time (one
day) elapses before Cisco Unified Presence has successfully reestablished presence subscriptions, you
can restart the Cisco UP Presence Engine to reset the interval.
Related Topics
Performing an Intercluster Upgrade, page B-6
Contact List Size for Intercluster Upgrade
If you upgrade from Cisco Unified Presence Release 7.0(x) to Release 8.x, presence subscriptions to
remote contacts will not work for users who have reached their contact list size limit on the local or
remote cluster. The System Troubleshooter in Cisco Unified Presence Administration indicates if there
are users who have reached the contact list limit. To fix this issue, you must increase the maximum
contact list size value.
SIP Remote Contact Limit
Cisco Unified Presence has a maximum limit on the number of SIP remote contacts that can be active at
one time. This maximum value changes based on platform type, see
Table B-1
.
If you leave an intercluster peer running Release 7.0(x), you may exceed this limit depending on the
number of remote contacts on the 7.0(x) peer clusters. If you exceed the limit, Cisco Unified Presence
will not process the remaining contacts.
Table B-1
SIP Subscription Limits
Platform
Simultaneous SIP Subscriptions
Simultaneous SIP Call-legs
MCS-7825 (100MB
pre-allocation)
45000 5000
MCS-7845 (450MB
pre-allocation)
202500
22500