A primary server is allowed to modify VTP domain contents, and there can be at most one primary server per VTP domain at any time
- Chapter 2. Virtual LANs and VLAN Trunking
- from CCIE Routing and Switching v5.0 Official Cert Guide, Volume 1, Fifth Edition
- Publisher: Cisco Press
- Released: August 2014
There can be 2 if there is a network partition and switches in the different partitions are promoted to primary servers.
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