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AdvancedPublished 2026-07-03

VRRP: Tune Advertisements to 3 Seconds

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Advanced CCNP VRRP lab: standardize the VRRP advertisement interval to 3 seconds on a shared user VLAN. Two IOS routers (R1, R2) and two hosts connect to a single access switch on VLAN 10 (10.0.10.0/24). Both routers share VRRP group 1 and the same virtual IP 10.0.10.254 so hosts keep one default gateway. R1 is the master via priority 110; both routers explicitly set 'vrrp 1 timers advertise 3' to enforce a consistent master advertisement rate and backup master-down detection window. Verify with 'show vrrp' (Advertisement interval 3.000 sec) and host pings to the VIP.

Track
Est. time
45 minutes
Difficulty
Advanced
Topics

Learning objectives

  • Configure VRRP with a shared virtual IP on two routers in one LAN
  • Deterministically set the master router using VRRP priority
  • Standardize the VRRP advertisement interval to 3 seconds on both routers
  • Validate VRRP state and timers with IOS 'show vrrp'
  • Confirm host default gateway reachability via the VRRP VIP

Troubleshooting focus

  • Group number or virtual IP mismatch prevents VRRP peering
  • Timers configured on only one router cause non-standard behavior after role changes
  • PC default gateway pointed at a physical router IP instead of the VRRP VIP
  • Router LAN interface down or in the wrong VLAN on the switch
  • Subnet mask mismatch on the router LAN interfaces versus the hosts

Topology

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How this lab is graded
  • Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with access-class, are stated in the guide and do have to match.
  • Addresses, modes and protocol keywords are exact. An IP address, a subnet mask, switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide.
  • Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the running-config — a change that only exists in a terminal session never reaches the grader.
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