Microsoft NLB - Nexus 7000

[Luciano Vigano']

                   Ciao,

we are going to replace an old 6513 (CatOs + MSFC) and we found that there is a configuration for the Microsoft NLB:

arp 172.27.124.13 03bf.ac1b.7c0d ARPA
 
on Nexus we replaced it with

  
int vlan 2
ip arp 172.27.124.13 03bf.ac1b.7c0d
 
mac address-table multicast 03bf.ac1b.7c0d vlan 2 inte eth5/13
 
But we are still not able to ping the cluster ip.
 
Do we missed something?
 
Ciao e grazie!
Luciano

[Jerry Ye]

You need to include the following command:

vlan configuration 2

  layer-2 multicast lookup mac

Please test and let me know the result.

Regards,

jerry

[Luciano Vigano']

Ciao Jerry,

thanks for you update.

I've done as u suggested but still not able to ping

Ciao!

L.

[Jerry Ye]

Hm... okay, did you exit out of vlan configuration mode?

Secondly, did you include all the interfaces for your MS NLB servers? You only have 1 configured. Also, I am going to assume you did this on both Nexus 7000s.

Regards,

jerry

[Luciano Vigano']

Ciao Jerry,

Up to now, and in order to reduce the problem determination, we shut down others links, so the only interface where the multicast packet will arrive is 5/13 on NX Core 1.

I did an elam capture on module 5 and I was able to see that NX sends packets out to the 5/13 but no answer is gettin back.

We did another test: between the NX and the NLB servers there is a 4948 switch

NX (eth5/13) - (gi1/47) 4948 - NLB SERVERS

(it was in place also when the 6513 was there, and the config was never changed - static mac is pointed on correct interfaces) and there we connect a pc on the same vlan as NLB. Result: still not able to ping :-)

So in my opinion, the problem is on the NLB configuration or in the ESXi 5 which, after reboot, has something misconfigured.

Up to now we disabled NLB and everything works fine as expected; it will be interesting to check if there is a possibility to do an elam capture also on the 4948, in order to avoid to install wireshark on the M$oft cluster :-)

Ciao e grazie!

Luciano

[Jerry Ye]

Thanks for the update Luciano.

Regards,

jerry