350-601 · Question #95
In a virtual port channel (vPC) configuration, VRRP exhibits which characteristic?
The correct answer is C. VRRP works with vPC in an active/active mode. In a vPC configuration, VRRP operates in an effectively active/active mode where both vPC peer devices can forward traffic for the virtual IP address, leveraging the parallel forwarding paths provided by the vPC.
Question
In a virtual port channel (vPC) configuration, VRRP exhibits which characteristic?
Options
- AVRRP does not work with vPC due to industry standard requirements
- BVRRP works with vPC in traditional active/standby modes
- CVRRP works with vPC in an active/active mode
- DVRRP work with vPC as long as vPC peer-gateway is configured to address non-standard replies
How the community answered
(49 responses)- A4% (2)
- B2% (1)
- C92% (45)
- D2% (1)
Why each option
In a vPC configuration, VRRP operates in an effectively active/active mode where both vPC peer devices can forward traffic for the virtual IP address, leveraging the parallel forwarding paths provided by the vPC.
VRRP is explicitly designed to work with vPC, enhancing Layer 3 redundancy and forwarding capabilities without conflicting with industry standards.
While VRRP's internal state is active/standby, the combination of VRRP and vPC enables an active/active forwarding capability from the perspective of the network, which is a key advantage.
When VRRP is deployed on vPC peer devices, although VRRP itself maintains an active/standby state for the virtual IP address, the vPC allows both peer switches to actively forward traffic for that virtual IP, creating an effective active/active Layer 3 forwarding experience for downstream devices.
The vPC peer-gateway feature primarily optimizes ARP resolution and Layer 3 forwarding by allowing the non-owner vPC peer to respond to ARPs for the peer gateway, which complements but does not define the active/active nature of VRRP with vPC.
Concept tested: vPC and VRRP active-active interaction
Source: https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/guide_c07-688126.html
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