Overview
The purpose of a Data Center Interconnect (DCI) is to extend specific VLANs between different data centers. DCI offers Layer 2 adjacency for servers and Network Attached Storage (NAS) devices that are separated by large distances.
Beginning with Cisco NX-OS release 7.0(3)I2(2), Cisco Nexus 9000 series switches support DCI with FHRP isolation. However DCI with FHRP isolation is not supported on Cisco Nexus 9500 switches with N9K-X9636C-R and N9K-X9636Q-R line cards. Creating a single logical link between multiple sites with vPC allows you to take advantage of the benefits of STP isolation using BPDU filtering across the DCI vPC port-channel. With this configuration, Bridge Protocol Data Unit (BPDU) does not cross between data centers, effectively isolating the STP fault domain between sites.
Note |
vPC is to interconnect a maximum of two data centers. |