Nexus 2248 ports for Hyper-V virtual switch uplink

JUSTIN LOUCKS · ‎09-30-2010

I'm having problems getting VMs sitting on a Hyper-V host to communicate properly. Does anyone know if there are issues with using the ports in on the Nexus 2248 and/or FEX modules in general for this purpose? Since they are seen as a Virtual Switch in the Hyper-V host machine, I'm wondering if it is a limitation of the FEX module.

kitanaka · ‎10-04-2010

Hi,

I have handy devices so tested that. I use

N2K-C2148T-1GE connected N5K-C5020P-BF-SUP NX-OS 5.0(2)N1(1)

and Win2008 server where Hyper-V is running.

I can ping from a VM to N5K SVI ip address vise versa.

Nexus & Fex Configuratin

====================

Nexus5020-A# show run fex

!Command: show running-config fex
!Time: Tue Oct 4 07:43:35 2011

version 5.0(2)N1(1)
feature fex

fex 140
pinning max-links 1
description "FEX0140"

interface port-channel140
fex associate 140

interface Ethernet1/13
fex associate 140

Nexus5020-A# show run int e140/1/1

interface Ethernet140/1/1
switchport access vlan 99

The VM is 99.99.99.10 / 0015.5d4e.4c05. I can ping to that from Nexus5020.

========================================================

Nexus5020-A#

Nexus5020-A# ping 99.99.99.10
PING 99.99.99.10 (99.99.99.10): 56 data bytes
64 bytes from 99.99.99.10: icmp_seq=0 ttl=127 time=1.967 ms
64 bytes from 99.99.99.10: icmp_seq=1 ttl=127 time=0.857 ms
64 bytes from 99.99.99.10: icmp_seq=2 ttl=127 time=0.78 ms
64 bytes from 99.99.99.10: icmp_seq=3 ttl=127 time=0.793 ms
64 bytes from 99.99.99.10: icmp_seq=4 ttl=127 time=0.798 ms

--- 99.99.99.10 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 0.78/1.039/1.967 ms

Nexus5020-A# show ip arp

IP ARP Table for context default
Total number of entries: 2
Address         Age       MAC Address     Interface
99.99.99.2      00:17:15 000d.eca2.fe3c Vlan99
99.99.99.10     00:00:22 0015.5d4e.4c05 Vlan99

Nexus5020-A# show mac address-table vlan 99

Legend:

* - primary entry, G - Gateway MAC, (R) - Routed MAC, O - Overlay MAC

age - seconds since last seen,+ - primary entry using vPC Peer-Link

VLAN MAC Address Type age Secure NTFY Ports

---------+-----------------+--------+---------+------+----+------------------

* 99 0015.5d4e.4c05 dynamic 80 F F Eth140/1/1

VM (Windows 7)

Is there any configuration issue on Hyper-V side ?

Here is my VM configuration and Network Manager.

# The OS is Japanese but you can compare with yours.

Regards,

Kimihito.

JUSTIN LOUCKS · ‎10-04-2010

Thanks for the reply. I did end up figuring this out. It was a VLAN turnking issues on the core layer above the 5K and not a Nexus 2K limitation. So far the Nexus 2K switches are working out fine although I think I may be done 2960S switch stacks with the 10GB uplinks from my distribution layer if I had to do it all over again for just 10/100/1000 ports. Obviously the new 2232 models with oversubscribed 10GB ports are unique to this line of devices.