NLB with 2 Cisco 6506

Unanswered Question
May 19th, 2007


I have 2 Cisco 6506. On every on is two Microsoft Exchange connected. The Active Standby Cluster of Microsoft Exchange works fine. But the OWA Frontend Server NLB Cluster (installed on a virtuell Maschine on the Exchange Server) do not work correct.

There is a loadbalancing 40 to 300 session and the failover (Disconnect one Exchange Server) do not work.

I have make 2 entry's on both Cisco6506.

First Entry: arp 0100.5e7f.0242 ARPA

Second Entry: mac-address-table static 0100.5e7f.0242 vlan 11 interface GigabitEthernet5/17

This Config Entry are on both Cisco 6506.

The NLB cluster works with Multicast and IGMP.

What is wrong?


I have this problem too.
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