Home » Cisco » 350-080 » Which statement describes the use of the vPC peer-keepalive link in this topology?
Refer to the exhibit.
The network topology that is shown in the exhibit has two aggregation switches (SW1 and SW2). The access layer switch connects to both aggregation switches. On SW1 and SW2, ports connecting to the access layer switches are configured as vPC member ports. SW1 and SW2 are also connected using a port channel that is configured as a vPC peer link. Which statement describes the use of the vPC peer-keepalive link in this topology?
A. The peer-keepalive link is used for synchronizing MAC addresses between Agg1 and Agg2.
B. The peer-keepalive link is used for control plane traffic. The peer link is used for the data plane.
C. The peer-keepalive link is used to resolve dual-active scenarios, where the peer link connectivity is lost.
D. The peer-keepalive link is used for the communication of orphaned ports.
Correct Answer: C
Explanation/Reference:
Explanation:
A routed “link” (it is more accurate to say “path”) is used to resolve dual-active scenarios in which the peer link connectivity is lost. This link is referred to as a vPC peer-keepalive or fault-tolerant link. The peer-keepalive traffic is often transported over the management network through the management 0 port of the Cisco Nexus 5000 Series Switch or the management 0 ports on each Cisco Nexus 7000 Series supervisor. The peer-keepalive traffic is typically routed over a dedicated Virtual Routing and Forwarding (VRF) instance (which could be the management VRF, for example).
The keepalive can be carried over a routed infrastructure; it does not need to be a direct point-to-point link, and, in fact, it is desirable to carry the peerkeepalive traffic on a different network instead of on a straight point-to-point link.
Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/design_guide_c07-625857.html