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New Member

Connecting Servers to Nexus 5K

Hi Friends

We have 2 nexus 5K installed in our data centre recently and we are connecting new three servers to nexus switches.

Each server has 2 10GB ports . 1 port of serverA is connected 5K1 and other port is connected 5K2 ( sameway other 2 server connected to Neuxs 5K1 and 5K2 Switches).

So do we need to create each VPC with Portchannel (like VPC 1,2 and 3 ) for each server connection?

Can you please help me on this ?

Thanks

Sri

1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

Connecting Servers to Nexus 5K

You're welcome Sri

From first look configs seems are fine.

But still ou need to run some checks when you'll configure your server.

HTH,

Alex

11 REPLIES
Cisco Employee

Connecting Servers to Nexus 5K

Hi Sri

This depends from what you want to achive.

If you want to bond 2 server nics and get 20Gig link towards the server - then yes - n5ks has to run vpc. and portchannel towards the server should be configured as vpc.

But if you will run two links as active/standby on the server, or two separated links with different IPs or different vlans  - there is no need in vpc.

HTH,

Alex

New Member

Connecting Servers to Nexus 5K

HI Alex,

Thanks for your help...

Yes I want to bond 2 server NICs and get 20Gig.

But When i configured portchannel and VPC on both Nexus 5ks. I see an error message only on 5k2 as "

Consistency Check Not Performed "

interface port-channel100

switchport mode trunk
vpc 100

----------

100    Po100       down*  failed      Consistency Check Not     

------------------

But we are NOT getting any error on Nexus5k1..please suggest

Cisco Employee

Connecting Servers to Nexus 5K

Is the port on n5k2 connected to server and in up state?

Add here from both n5k

sh run vpc

sh run int po100

sh run int eth x/y - where x/y member-interface of port-channel 100

sh port-c summ

Alex

New Member

Connecting Servers to Nexus 5K

Yes servers are connected to both nexus 5Ks ,but IP address are NOT configured on 10 Gib ports at servers side.

5K1# sh run vpc

!Command: show running-config vpc
!Time: Fri Mar 16 12:16:32 2012

version 5.0(3)N1(1c)
feature vpc

vpc domain 13
  role priority 1
  peer-keepalive destination 10.*.*.* source 10.*.*.*
  peer-gateway

interface port-channel41
  vpc 41

interface port-channel51
  vpc peer-link

interface port-channel100
  vpc 100


5K2# sh run vpc

!Command: show running-config vpc
!Time: Fri Mar 16 12:16:42 2012

version 5.0(3)N1(1c)
feature vpc

vpc domain 13
  role priority 100
  peer-keepalive destination 10.*.*.* source 10.*.*.*
  peer-gateway

interface port-channel41
  vpc 41

interface port-channel51
  vpc peer-link

interface port-channel100
  vpc 100

---------------------

Port channel configuration same on both nexus..

  switchport mode trunk

  vpc 100

----------------------------

Show port-cha sum

100   Po100(SD)   Eth      LACP      Eth1/1(I)  -------- > 5K1

100   Po100(SD)   Eth      LACP      Eth1/2(I) ----------->5K2

_______________________

N5K1# sh run int eth1/1

!Command: show running-config interface Ethernet1/1
!Time: Fri Mar 16 12:25:01 2012

version 5.0(3)N1(1c)

interface Ethernet1/1
  switchport mode trunk
  channel-group 100 mode active

N5K2# sh run int eth1/2

!Command: show running-config interface Ethernet1/2
!Time: Fri Mar 16 12:25:30 2012

version 5.0(3)N1(1c)

interface Ethernet1/2
  switchport mode trunk
  channel-group 100 mode active

Cisco Employee

Connecting Servers to Nexus 5K

Check whether your vpc is up:

sh vpc

an also both member ports are in I state - that means that they don't receive lacp from the server side.

Alex

New Member

Connecting Servers to Nexus 5K

Alex,

Thanks for your help... Anyway server will be configured shotly..I will let you know the result.

I hope, our configuration is fine.

Thanks

Sri

Cisco Employee

Connecting Servers to Nexus 5K

You're welcome Sri

From first look configs seems are fine.

But still ou need to run some checks when you'll configure your server.

HTH,

Alex

New Member

Connecting Servers to Nexus 5K

Sorry I see that they are trunk ports. Are any VPC up ? show vpc

New Member

Connecting Servers to Nexus 5K

Hi Alex,

Server are connected and configured. I see port channels are up and servers getting 20Gig speed now.

I would realy appreciate your help.

Thanks

Sri

Cisco Employee

Connecting Servers to Nexus 5K

Hi Sri

Happy to hear that everything works now.

Have a great day.

Regards,

Alex

New Member

Connecting Servers to Nexus 5K

Sri,

Are you allowing Vlan 100 on the peer-link? Based on your config this would be po 51

Jim

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