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20-5
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 20 Configuring VRRP
Information About VRRP
vPC and VRRP
VRRP interoperates with virtual port channels (vPCs). vPCs allow links that are physically connected
to two different Cisco Nexus 7000 series devices to appear as a single port channel by a third device. See
the Cisco Nexus 7000 Series NX-OS Layer 2 Switching Configuration Guide, Release 4.x for more
information on vPCs.
vPC forwards traffic through both the master VRRP router as well as the backup VRRP router. See the
“Configuring VRRP Priority” section on page 20-9.
Note You should configure VRRP on the primary vPC peer device as active and VRRP on the vPC secondary
device as standby.
VRRP Advertisements
The VRRP master sends VRRP advertisements to other VRRP routers in the same group. The
advertisements communicate the priority and state of the master. Cisco NX-OS encapsulates the VRRP
advertisements in IP packets and sends them to the IP multicast address assigned to the VRRP group.
Cisco NX-OS sends the advertisements once every second by default, but you can configure a different
advertisement interval.
VRRP Authentication
VRRP supports the following authentication mechanisms:
• No authentication
• Plain text authentication
VRRP rejects packets in any of the following cases:
• The authentication schemes differ on the router and in the incoming packet.
• Text authentication strings differ on the router and in the incoming packet.
VRRP Tracking
VRRP supports the following two options for tracking:
• Native interface tracking— Tracks the state of an interface and use that state to determine the
priority of the VRRP router in a VRRP group. The tracked state is down if the interface is down or
if the interface does not have a primary IP address.
• Object tracking—Tracks the state of a configured object and use that state to determine the priority
of the VRRP router in a VRRP group. See Chapter 21, “Configuring Object Tracking” for more
information on object tracking.
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