each port is a trunk and carry the same VLAN

[Ibrahim Jamil]

Hi

can i have 4 links from an ESX server to 6500 , each link represents a trunk link carries each the same 2 VLAN , 100 and 101 , keep port-channel out of the picture , does it work well???

thanks

Ibrahim

[John Blakley]

Jamil,

It works. We have ESX servers that have multiple vlans configured on the ports they connect to. I can't help with the ESX portion of the setup because I don't do that side of things, but I can assure you that I don't have channel-groups configured for these servers.

HTH,
John

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[Ibrahim Jamil]

Hi Jhon

i mean the same VLANs on each trunk port like below, how come>

6500

int g0/0

sw tunk encap do1q

sw mod trunk

sw trun allow vlan 10,20

int g0/1

sw tunk encap do1q

sw mod trunk

sw trun allow vlan 10,20

int g0/2

sw tunk encap do1q

sw mod trunk

sw trun allow vlan 10,20

thanks

[John Blakley]

Yes, it works:

interface GigabitEthernet2/47

switchport

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,110,126,131

switchport mode trunk

storm-control broadcast level 0.05

storm-control multicast level 0.05

end

interface GigabitEthernet4/45

switchport

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,110,126,131

switchport mode trunk

storm-control broadcast level 0.05

storm-control multicast level 0.05

end

interface GigabitEthernet4/48

switchport

switchport trunk encapsulation dot1q

switchport trunk allowed vlan 1,110,126,131

switchport mode trunk

storm-control broadcast level 0.05

storm-control multicast level 0.05

These are from my switch. I have a single VM server (all of ours use 6 links: 5 trunked and a service console) attached to these ports.

HTH,
John

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[Ibrahim Jamil]

thanks john , one question pls, what is the drawback of this config without a port-channel ?

[John Blakley]

Here's a link that may be able to explain better than I can:

http://serverfault.com/questions/215341/vmware-networking-portchannel-or-not (Older document)

This is from VMWare:

http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1004048

As far as the server itself is concerned and to which is better, I can't tell you for sure since I don't work on the vmware servers. I believe we use vmotion which moves a vm to another server should that link go down. If you're using etherchannels, you'll be able to use all of the links, but you'll still never get more than 1Gb even if you have 4 ports in the etherchannel (the data can still only go so fast). I'm not sure how that translates to using multiple trunks vs etherchannel because our server team has never asked for etherchannels to be created. Although, now you have me curious and I may go ask them why we've never done it...

HTH,
John

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[Ibrahim Jamil]

thanks jhon

[mahmoodmkl]

Hi,

In addition to Jhon's post all the link can work if they are connected to VSS.

I seen issue with mac-flapping messages on the switches where the VM's are deployed.

Thanks

[Ibrahim Jamil]

Hi Jhon , Hi mahmood

in my case i dont have VSS ,  how did you solved the mac-flapping?

thanks

[mahmoodmkl]

Hi
this cannot be solved as vms are moved from time to time by the server guys which u cannot control

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[Ibrahim Jamil]

Hi

what about the non VSS ?

thanks

[mahmoodmkl]

Hi
in our scenario we configured port channels and the same was done from blade enclosure side for non vss but the above issue is for non vss for vss this not the issue



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[Ibrahim Jamil]

thanks mahmood , see you in other thread