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.
The vPC provides the benefit of STP isolation between the two sites (no Bridge Protocol Data Unit (BPDU) across the DCI vPC). This means that an outage in the data center is not propagated to the remote data center because redundant links are still provided between the data centers.
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.
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. |
Note |
The supported platforms include Cisco Nexus 9500 Series switches with N9K-X9636C-R, N9K-X9636Q-R, N9K-X9636C-RX line cards. |