08-23-2010 05:28 PM
Hi,
Can anyone tell me if it's possible to create a VPC directly from a Nexus 5000 to an ESX Host? My host is running 2 Qlogic 8152 CNAs, and i've got them connecting to 2 Nexus 5000 switches. My problem is, when I create the VPC and I bind the VFC to the newly created port channel, everything but the VFC comes up.
See output below:
sh int brie
-------------------------------------------------------------------------------
Interface Vsan Admin Admin Status SFP Oper Oper Port
Mode Trunk Mode Speed Channel
Mode (Gbps)
-------------------------------------------------------------------------------
fc2/1 500 auto auto trunking swl TE 4 --
fc2/2 4094 auto auto sfpAbsent -- -- --
fc2/3 1 auto on sfpAbsent -- -- --
fc2/4 1 auto on sfpAbsent -- -- --
--------------------------------------------------------------------------------
Ethernet VLAN Type Mode Status Reason Speed Port
Interface Ch #
--------------------------------------------------------------------------------
Eth1/1 1 eth trunk up none 10G(D) 11
Eth1/2 1 eth trunk up none 10G(D) --
Eth1/3 161 eth access down SFP not inserted 10G(D) --
Eth1/4 161 eth access down SFP not inserted 10G(D) --
Eth1/5 161 eth access down SFP not inserted 10G(D) --
Eth1/6 161 eth access down SFP not inserted 10G(D) --
Eth1/7 161 eth access down SFP not inserted 10G(D) --
Eth1/8 161 eth access down SFP not inserted 10G(D) --
Eth1/9 161 eth access down SFP not inserted 10G(D) --
Eth1/10 161 eth access down SFP not inserted 10G(D) --
Eth1/11 161 eth access down SFP not inserted 10G(D) --
Eth1/12 161 eth access down SFP not inserted 10G(D) --
Eth1/13 1 eth trunk up none 10G(D) --
Eth1/14 1 eth trunk up none 10G(D) --
Eth1/15 1 eth trunk down SFP not inserted 10G(D) --
Eth1/16 1 eth trunk down SFP not inserted 10G(D) --
Eth1/17 161 eth access down SFP not inserted 10G(D) --
Eth1/18 161 eth access down SFP not inserted 10G(D) --
Eth1/19 1 eth trunk up none 10G(D) 100
Eth1/20 1 eth trunk up none 10G(D) 100
Eth2/1 1 eth trunk down Administratively down 10G(D) --
Eth2/2 1 eth access down SFP not inserted 10G(D) --
Eth2/3 1 eth trunk up none 10G(D) 10
Eth2/4 1 eth access down SFP not inserted 10G(D) --
--------------------------------------------------------------------------------
Port-channel VLAN Type Mode Status Reason Speed Protocol
Interface
--------------------------------------------------------------------------------
Po10 1 eth trunk up none a-10G(D) none
Po11 1 eth trunk up none a-10G(D) none
Po100 1 eth trunk up none a-10G(D) none
--------------------------------------------------------------------------------
Port VRF Status IP Address Speed MTU
--------------------------------------------------------------------------------
mgmt0 -- up X.X.X.X 1000 1500
-------------------------------------------------------------------------------
Interface Vsan Admin Admin Status SFP Oper Oper Port
Mode Trunk Mode Speed Channel
Mode (Gbps)
-------------------------------------------------------------------------------
vfc1 500 F on down -- -- --
Only pay attention to VFC 1 in this output. This is the VFC that I have binded to Po11, which relates to physical port e1/1.
The output is the same on both switches.
I was told that if you have 4 ports going out to 1 ESX Host (2 to each switch), I would need to create 2 VPCs with 1 port from each switch. This is what I am trying to do, but the first VPC I'm trying to create is failing.
Any ideas?
Thanks.
08-24-2010 05:21 PM
Since posting this i've realized that it's Spanning tree that is causing the issue on switch 2.
I created a vpc between my 2 nexus 5000s. Then...
On switch 1 my fcoe vlan is 500 (matching vsan 500). All ports are forwarding in STP because this bridge is the root for vlan 500.
On switch 2 my fcoe vlan is 501 (matching vsan 501). Even though this bridge is root for vlan 501, the port-channel going to my host is in
blocking mode. This is very weird behaviour considering a root bridge shouldn't be blocking any ports...
Here's the output from switch 2.
VLAN0501
Spanning tree enabled protocol rstp
Root ID Priority 33269
Address 0005.9b73.523c
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 33269 (priority 32768 sys-id-ext 501)
Address 0005.9b73.523c
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Po11 Desg BLK 1 128.4106 (vPC) P2p
Eth1/13 Desg FWD 2 128.141 Edge P2p
Eth1/14 Desg FWD 2 128.142 Edge P2p
On switch 1, all the ports are forwarding, which is why the VFC comes up on that switch. But on switch 2, because Po11 is blocked, the VFC bound to it never comes up.
Anybody have any idea why this port would get blocked?
09-10-2010 05:03 AM
I see STP thinks STP state is P2P. It should be edge P2P. I am suspecting you do not have "spanning-tree port type edge trunk" configured on the interface port-channel 11. I have seen this issue and recently filed a new defect since I believe STP state should not be blocking for missing this configuration or misconfiguring the trunk interface.
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCti79446
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