Thoughs on interconnecting Nexus 3548 and 3750 switches

[Andrew Cormier]

Hi,

I have two nexus 3548 switches.

I have created port-group 1  on both switches to group eth1/47 with eth1/48.

I have 4 sfps, 2 per switch. to connect to a single 3750 that I want to group together as well.

So I have gi1/0/31 going to eth1/1 on nexus1 and gi1/0/32 going to eth1/2 on nexus1

I have gi1/0/33 goin to eth1/1 on nexus2 and gi1/0/32 goin to eth1/2 on nexus2

When I create the port group on the 3750 do I create one group with all 4 ports or will I have to create 2, one per nexus switch?

Thanks

[glen.grant]

   You need to setup  a vpc  for the switch.  You will use the same port-channel number and the same vpc number on both nexus boxes once setup .

[Ruben Cocheno]

To have VPC enabled you need to do a couple of things firts:

• Enable the vPC feature.

• Create a vPC domain and enter vpc-domain mode.

• Configure the vPC peer keepalive link.

• (Optional) Configure system priority.

• (Optional) Configure vPC role priority.

• Create the vPC peer link.

• Move the PortChannel to vPC.

http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5000-series-switches/configuration_guide_c07-543563.html

[Andrew Cormier]

Thanks for the replies. I finally got to test the hardware and config yesterday.
Just so I am clear. the vpc and peer to peer links are only for interconnecting the two Nexus switches. I think I got that right. sho VPC br seems to say it is up. I am using Po5
vPC domain id : 1
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status : success
Per-vlan consistency status : success
Type-2 consistency status : success
vPC role : secondary
Number of vPCs configured : 0
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Disabled
vPC Peer-link status
---------------------------------------------------------------------
id Port Status Active vlans
-- ---- ------ --------------------------------------------------
1 Po5 up 1
Next do I create a port channel on Nex1 and Nex2 for the two ports that connect to the 3750 (Po6 for example) or do I add the two links to the 3750s to Po5 ? I thought I add them to Po 5 but since I am mixing 1000 and 10G ports it doesnt seem to like it.

[glen.grant]

  If using a vpc all ports in a port channel must be the same speed .

[Andrew Cormier]

Thanks. Spoke with someone at Nutanix who was able to (I think) get this working somewhat.

Int eth 47/48 are channel-group 5 on both switches

Int eth 1/2 are channel group 6 on both switches

Po 5 is in vpc 6 and Po6 in in vpc 6

Gi1/0/33-36 on the 3750 is Channel group 6 on the 3750 (33/34 go to Nex1 and 35/36 to Nex 2)

Stll cant get to nodes on the Nexus but all the trunks are up so That might be ok

[pradeepser]

In 3750 you need to create one group will all 4 ports in it. On the Nexus end you need to configure vPC which will pair both Nexus as a unique layer2 logical node.

Pradeep