Cisco N7K-C7010 Configuration Guide - Page 216
vPC Topology, Switch vPC Topology
UPC - 882658174445
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Information About vPCs Chapter 7 Configuring vPCs Send document comments to [email protected] mode to configure port channels in each vPC, which ensures an optimized, graceful recovery in a port-channel failover scenario and provides configuration checks against configuration mismatches among the port channels themselves. The vPC peer devices use the vPC domain ID that you configure to automatically assign a unique vPC system MAC address. Each vPC domain has a unique MAC address that is used as a unique identifier for the specific vPC-related operations, although the devices use the vPC system MAC addresses only for link-scope operations, such as LACP. We recommend that you create each vPC domain within the contiguous Layer 2 network with a unique domain ID. You can also configure a specific MAC address for the vPC domain, rather than having the Cisco NX-OS software assign the address. See the "CFSoE" section on page 7-26 for more information on displaying the vPC MAC table. After you create a vPC domain, the Cisco NX-OS software creates a system priority for the vPC domain. You can also configure a specific system priority for the vPC domain. Note When manually configuring the system priority, you must ensure that you assign the same priority value on both vPC peer devices. If the vPC peer devices have different system priority values, vPC will not come up. vPC Topology Figure 7-9 shows a basic configuration in which the Cisco Nexus 7000 Series Switch ports are directly connected to another switch or host and are configured as part of a port channel that becomes part of a vPC. Figure 7-9 Switch vPC Topology mgmt0 mgmt0 281766 Eth1/10 P020 vPC20 Eth2/1 In the figure, vPC 20 is configured on port channel 20, which has Eth1/10 on the first switch and Eth2/1 on the second as member ports. Beginning with Cisco NX-OS Release 5.2(1), you can configure a vPC from the peer devices through Fabric Extenders (FEXs), as shown in Figure 7-10. 7-14 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x OL-23435-03