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Nexus Switching 2nd Edition

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Note<br />

The OTV feature is disabled by default. OTV needs to be enabled with the feature otv<br />

cli.<br />

Example 11-3. Sample Configuration for the OTV Overlay Interface<br />

Click here to view code image<br />

feature otv<br />

interface Overlay1<br />

otv join-interface port-channel1001<br />

otv control-group 239.1.1.1<br />

otv data-group 232.0.0.0/24<br />

otv extend-vlan 10, 12, 14, 18-19, 24, 34, 37, 52, 56-<br />

69, 75-79, 86-87, 99, 102-<br />

103, 106, 116, 120, 122<br />

no shutdown<br />

• OTV site VLAN: The OTV site-VLAN is used to discover other Edge Devices in a<br />

multihomed topology. OTV Edge Devices within the same site establish an OTV<br />

adjacency over the site VLAN <strong>and</strong> elect the Authoritative Edge Device (AED) for<br />

each extended VLAN. The OTV site VLAN needs to be trunked on the OTV internal<br />

interfaces of the OTV Edge Device. It is recommended that the OTV site VLAN is<br />

unique per location <strong>and</strong> does not overlap with any other VLANs in the topology,<br />

meaning the VLAN ch<strong>os</strong>en to be the OTV site VLAN serves only this purp<strong>os</strong>e.<br />

Example 11-4 shows how to configure the OTV site VLAN on the OTV VDC; the site<br />

VLAN needs to be allowed on the OTV internal interfaces as well.<br />

Example 11-4. Sample Configuration for the OTV Site VLAN<br />

vlan 1000<br />

name otv-site-vlan<br />

otv site-vlan 1000<br />

• OTV site-id: With NX-OS release 5.2.1 <strong>and</strong> later, a second OTV adjacency is<br />

maintained, the overlay adjacency. The overlay adjacency is established over the OTV<br />

join-interfaces acr<strong>os</strong>s the Layer 3 network. Each OTV Edge Device located in the<br />

same site must be configured with the same site-identifier (site-id). The new site-id is<br />

advertised in IS-IS hello packets as a part of OTV <strong>and</strong> is sent over both the overlay<br />

<strong>and</strong> on the OTV site VLAN. The second adjacency protects against when the OTV site<br />

VLAN is partitioned between the OTV Edge Devices in the same site. The site-

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