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Difficulty: MediumFirst Hop Redundancy Protocols (HSRP and VRRP)

A network administrator is evaluating the operational parameters and default behaviors of First Hop Redundancy Protocols (FHRP) on Cisco IOS devices. Which two statements accurately describe default differences between VRRPv2 and HSRPv1?

  1. VRRP preemption is enabled by default, whereas HSRP preemption is disabled by default.Answer
  2. VRRPv2 uses the destination multicast IP address 224.0.0.18, whereas HSRPv1 uses 224.0.0.2.Answer
  3. C
    HSRPv1 permits the configured virtual IP address to match a physical interface IP address on a participating router, whereas VRRP prohibits this configuration.
  4. D
    VRRP Master routers transmit advertisement packets every 3 seconds by default, whereas HSRP Active routers transmit hello packets every 1 second by default.

Answer

VRRP preemption is enabled by default while HSRP preemption is disabled by default, and VRRPv2 utilizes destination multicast address 224.0.0.18 while HSRPv1 utilizes 224.0.0.2.
VRRPv2 operates with preemption enabled by default and sends advertisements to multicast IP address 224.0.0.18. In contrast, HSRPv1 has preemption disabled by default (requiring explicit configuration) and sends hello messages to multicast IP address 224.0.0.2.

Step-by-Step Solution

1
Analyze preemption default settings for both protocols.
VRRP automatically enables preemption so that a router with higher priority assumes the Master role without manual CLI intervention. HSRP defaults to preemption disabled, requiring the 'standby <group> preempt' command.
Understanding protocol default behaviors is essential for predicting failover performance.
2
Analyze multicast addressing and transport mechanisms.
VRRPv2 uses multicast address 224.0.0.18 over IP protocol 112. HSRPv1 uses multicast address 224.0.0.2 over UDP port 1985.
Differentiating control plane encapsulation helps when analyzing packet captures or ACL filter requirements.
3
Evaluate IP address ownership rules.
VRRP supports IP address ownership where the virtual IP matches a router interface IP (priority 255). HSRP explicitly forbids assigning an active physical IP address as the virtual IP address.
Misinterpreting IP assignment rules causes CLI configuration errors when setting up HSRP virtual gateways.

Key Concept

HSRP and VRRP Feature and Default Parameter Comparison
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Topics

First Hop Redundancy Protocols (HSRP and VRRP)

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