CCNA NTP: Symmetric Active Peers on a /30

Bundle lab · $29.99

Configure two Cisco IOS routers as symmetric-active NTP peers over a single /30 link. R1 is an authoritative clock (ntp master 4) and both routers form a symmetric peer relationship with ntp peer. Learn how peer mode differs from client/server, and how to verify and troubleshoot associations without relying on Internet sources.

Learning objectives

• Differentiate ntp server (client/server) from ntp peer (symmetric-active)
• Configure an authoritative clock using ntp master 4 on R1
• Form symmetric NTP peer associations between R1 and R2
• Verify associations with show ntp associations and interpret peer mode
• Troubleshoot common NTP peering issues in a flat, single-subnet topology

Troubleshooting focus

• Association present but wrong mode (server vs peer): verify use of ntp peer on both routers
• No association at all: check interface status, IP addressing, and L2 link
• Drift or no tracking: confirm R1 is authoritative (ntp master 4) so peers have a selectable source