[c-nsp] Microsoft NLB vs Cisco

[Sidney Boumendil]

On Mon, May 12, 2008 at 2:19 AM, Tim Durack <tdurack at gmail.com> wrote:
> Amazing, think I found a fix:
>  http://www.skendric.com/packet/msnlb-catalyst-configuration.pdf
>
>  MS NLB requires not just a static ARP entry, but a static MAC too,
>  something like:
>
>  arp a.b.c.d 0100.5e7f.ccdd
>  mac-address-table static 0100.5e7f.ccdd vlan x interface G1/45 G1/46
>  disable-snooping
>
>  The cluster still works and CPU is back to normal (I've also proved
>  12.2(33)SXH2 can run at 90-100% without dropping routing sessions or
>  crashing :-)
>
>  (Big thanks to Stuart Kendrick who wrote the above link!)
>
>  Tim:>

Hi,

There is a document on Cisco's site explaining precisely this problem.
It also happens with Nokia/Checkpoint VRRP and Bluecoat clusters.

http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml

Sidney