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18-6
Cisco Nexus 7000 Series NX-OS Unicast Routing Configuration Guide, Release 4.x
OL-20002-02
Chapter 18 Configuring GLBP
Licensing Requirements for GLBP
In Figure 18-2, the Ethernet 1/2 interface on router 1 is the gateway for host 1 (the AVF for virtual MAC
address, vMAC1), while Ethernet 2/2 on router 2 acts as a secondary virtual forwarder for Host 1.
Ethernet 1/2 tracks Ethernet 3/1, which is the network connection for router 1. If Ethernet 3/1 goes down,
the weighting for Ethernet 1/2 drops to 90. Ethernet 2/2 on router 2 preempts Ethernet 1/2 and takes over
as AVF because it has the default weighting of 100 and is configured to preempt the AVF.
See the “Configuring GLBP Weighting and Tracking” section on page 18-10 for details about
configuring weighting and tracking.
High Availability
GLBP supports stateful restarts and stateful switchover. A stateful restart occurs when the GLBP process
fails and is restarted. Stateful switchover occurs when the active supervisor switches to the standby
supervisor. Cisco NX-OS applies the run-time configuration after the switchover.
Virtualization Support
GLBP supports Virtual Routing and Forwarding instances (VRFs). VRFs exist within virtual device
contexts (VDCs). By default, Cisco NX-OS places you in the default VDC and default VRF unless you
specifically configure another VDC and VRF.
If you change the VRF membership of an interface, Cisco NX-OS removes all layer 3 configuration,
including GLBP.
For more information, see the Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration
Guide, Release 4.x and see Chapter 14, “Configuring Layer 3 Virtualization.”
Licensing Requirements for GLBP
The following table shows the licensing requirements for this feature:
Prerequisites for GLBP
GLBP has the following prerequisites:
• Globally enable the GLBP feature (see the “Enabling the GLBP Feature” section on page 18-7).
• You can only configure GLBP on Layer 3 interfaces (see the Cisco Nexus 7000 Series NX-OS
Interfaces Configuration Guide, Release 4.xCisco DCNM Interfaces Configuration Guide, Release
4.x).
• If you configure VDCs, install the Advanced Services license and enter the desired VDC (see the
Cisco Nexus 7000 Series NX-OS Virtual Device Context Configuration Guide, Release 4.xCisco
DCNM Virtual Device Context Configuration Guide, Release 4.x).
Product License Requirement
NX-OS GLBP requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to you. For a complete explanation of the NX-OS licensing
scheme, see the Cisco NX-OS Licensing Guide.
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