Cisco N7K-C7010 Configuration Guide - Page 205

Chapter 7 Configuring vPCs Information About vPCs Send document comments to [email protected] Figure 7-1 vPC Architecture vPC domain Nexus 7000 Nexus 7000 device vPC peer link device vPC device Peer-keepalive link vPC device 273225 You can use only Layer 2 port channels in the vPC. A vPC domain is associated to a single VDC, so all vPC interfaces belonging to a given vPC domain must be defined in the same VDC. You must have a separate vPC peer link and peer-keepalive link infrastructure for each VDC deployed. Consolidating a vPC pair (two vPC peer devices of the same domain) in two VDCs of the same physical device is not supported. The vPC peer link must use 10-Gigabit Ethernet ports for both ends of the link or the link will not form. You configure the port channels by using one of the following: • No protocol • Link Aggregation Control Protocol (LACP) When you configure the port channels in a vPC-including the vPC peer link channel-without using LACP, each device can have up to 8 active links in a single port channel. When you configure the port channels in a vPC-including the vPC peer link channels-using LACP, each device can have 8 active links and 8 standby links in a single port channel. (See the "vPC Interactions with Other Features" section on page 7-20 for more information on using LACP and vPCs.) Note You must enable the vPC feature before you can configure or run the vPC functionality. Beginning with Cisco NX-OS Release 4.2, the system automatically takes a checkpoint prior to disabling the feature, and you can roll back to this checkpoint. See the Cisco Nexus 7000 Series NX-OS System Management Configuration Guide, Release 5.x, for information on roll backs and checkpoints. After you enable the vPC functionality, you create the peer-keepalive link, which sends heartbeat messages between the two vPC peer devices. You can create a vPC peer link by configuring a port channel on one Cisco Nexus 7000 Series chassis by using two or more 10-Gigabit Ethernet ports in dedicated mode. To ensure that you have the correct hardware to enable and run vPC beginning with Cisco NX-OS Release 4.1(5), enter the show hardware feature-capability command. If you see an X across from vPC, your hardware cannot enable the vPC feature. We recommend that you configure the vPC peer link Layer 2 port channels as trunks. Then, on another Cisco Nexus 7000 Series chassis, you configure another port channel again using two or more 10-Gigabit Ethernet ports in dedicated mode. Connecting these two port channels creates a vPC peer link in which OL-23435-03 Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x 7-3