Connecting Servers to Nexus 5K

[s.kanth]

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

[Oleksandr Nesterov]

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

[s.kanth]

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

[Oleksandr Nesterov]

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

[s.kanth]

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

[Oleksandr Nesterov]

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

[s.kanth]

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

[Oleksandr Nesterov · Accepted solution]

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

[Jim Moore]

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

[s.kanth]

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

[Oleksandr Nesterov]

Hi Sri

Happy to hear that everything works now.

Have a great day.

Regards,

Alex

[Jim Moore]

Sri,

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

Jim