For Active Directory topologies with geographically distributed domain controllers where authentication against one domain controller may be too slow, Cisco's 12.x Preferred Architecture points the authentication agreement at a Global Catalog server by configuring LDAP port 3268.
Checked 2026-09-30
- Vendor
- Cisco
- Product
- Unified Communications Manager
- Subsystem
- LDAP Authentication
- Deployment
- on-premises
- Region
- not restricted
- Release range
- Collaboration System Release 12.x design guidance; Microsoft Active Directory
- Checked
- 2026-09-30
Sources
- Preferred Architecture for Cisco Collaboration 12.x Enterprise On-Premises Deployments, CVD - Call Control — Cisco Systems · tier 2 current vendor documentation · section: User Authentication with LDAP (Global Catalog discussion)
Cite this note
APA
WarmTransfer. (2026, September 30). Setting up LDAP directory sync and authentication in Unified CM: source note cucm-ldap-sync-setup-gc-port-3268. WarmTransfer. https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-setup-gc-port-3268
BibTeX
@misc{warmtransfer-claim-cucm-ldap-sync-setup-gc-port-3268,
title = {Setting up LDAP directory sync and authentication in Unified CM: source note cucm-ldap-sync-setup-gc-port-3268},
author = {{WarmTransfer}},
year = {2026},
url = {https://warmtransfer.net/knowledge/claims/cucm-ldap-sync-setup-gc-port-3268},
note = {Source note cucm-ldap-sync-setup-gc-port-3268, checked 2026-09-30}
}