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Zorluk: ZorFirst Hop Redundancy Protocols (HSRP and VRRP)

A network operations engineer is migrating a dual-core distribution block from VRRPv2 to HSRPv2. During the migration on Switch-1 (interface VLAN 50, IPv4 address 10.50.1.1/24), the engineer attempts to assign 10.50.1.1 as the HSRP virtual IP address using the command `standby 50 ip 10.50.1.1`. The IOS XE CLI immediately returns an error and rejects the configuration. Which statement correctly explains the protocol design difference causing this failure?

  1. HSRP requires the virtual IP address to be an unassigned IP address within the subnet, whereas VRRP allows a router interface physical IP address to serve as the virtual IP address.Cevap
  2. B
    HSRP allows assigning a physical interface IP address as the virtual IP only if the standby priority is configured to 255 prior to issuing the virtual IP command.
  3. C
    HSRPv2 requires the virtual IP address to reside in a separate, non-overlapping IPv4 subnet from the primary interface IP address assigned to the SVI.
  4. D
    The router rejects the command because preemption must be explicitly disabled on the SVI before matching the virtual IP address to an existing physical address.

Cevap

HSRP requires the virtual IP address to be an unassigned IP address within the subnet, whereas VRRP allows a router interface physical IP address to serve as the virtual IP address.
In HSRP, the virtual IP address must be a distinct, unassigned address within the IP subnet shared by the participating routers. VRRP supports IP address ownership (where the virtual IP matches a physical interface IP address and gives that router priority 255), but HSRP strictly disallows assigning a router's physical interface IP address as the HSRP virtual IP address.

Adım Adım Çözüm

1
Analyze the operational rules for Cisco HSRP virtual IP address configuration.
HSRP (v1 and v2) mandates that the configured virtual IP address must be a unique, unassigned IP address within the local primary subnet and cannot match the physical IP address of any participating router interface.
Preventing IP overlap ensures standard ARP/ICMP processing and prevents local interface address conflicts in HSRP state machines.
2
Compare HSRP behavior with VRRP IP address ownership functionality.
VRRP permits the IP address owner scenario where the virtual IP matches the physical IP address of an interface on the Master router (setting priority automatically to 255).
This key design difference explains why a configuration valid in VRRP fails when replicated directly in HSRP.

Anahtar Kavram

First Hop Redundancy Protocols (HSRP vs. VRRP Virtual IP Assignment Rules)
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Konular

First Hop Redundancy Protocols (HSRP and VRRP)

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