Nexus 1000v and vPC-HM in the Cisco UCS environment.
The Nexus 1000v best practices for UCS whitepaper can be found from Cisco's site here.
Per the white paper, enabling the "channel-group auto mode on sub-group cdp" command would enable vPC-HM and automatically create sub-groups based on which Fabric Interconnect is the upstream switch from the blade server's perspective. An issue that can occur is that in some cases CDP may not be enabled, which doesn't allow for the automatic creation of the sub-group id's which the vPC-HM port channel uses to pin mac addresses to particular ports in the fabric.
A work-around to this issue is to use the command "channel-group auto mode on mac-pinning" on your uplink profile, and then to place the command: "sub-group-id X" on the physical uplink Ethernet ports, where X is 0 for Fabric A, and 1 for Fabric B.
Here's an example code snippit for enabling vPC-HM on the UCS with mac-pinning and manual sub-group-id's. Notice that the sub-group-id's only need to be unique per VEM, and not for the whole DVS:
port-profile type ethernet SYSUPLINK
vmware port-group
switchport mode trunk
switchport trunk allowed vlan 1,5-6,760-761
channel-group auto mode on mac-pinning
no shutdown
system vlan 1,760-761
state enabled
interface Ethernet3/1
inherit port-profile SYSUPLINK
sub-group-id 0
interface Ethernet3/2
inherit port-profile SYSUPLINK
sub-group-id
interface Ethernet4/1
inherit port-profile SYSUPLINK
sub-group-id 0
interface Ethernet4/2
inherit port-profile SYSUPLINK
sub-group-id 1
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Last Updated on Sunday, 30 January 2011 17:46.
