troubleshooting Question

IGMP Multicast mode - NLB for the Client Access Servers

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jonasdurstFlag for United States of America asked on
ExchangeRoutersSwitches / Hubs
5 Comments1 Solution1312 ViewsLast Modified:
I'm building out a new domain and new Exchange environment.  Once DC so far and 4 exchange servers, 2 CAS/HUB and 2 MDB.   All server 2k8 r2 and Exchange 2010sp3. We don't have a Network Load Balancer appliance as of yet but I'm trying to setup Microsoft Network Load Balancing in IGMP Mulitcast mode (options are Unicast, Multicast, or IGMP Multicast).  I've seen issues here before with Unicast causing MAC-Flap on the switch ports...I'm testing/playing around with IGMP Mulitcast mode.   We have a Cisco 6500 series core with 3750 switches throughout the building.  

I've read some article on IGMP Snooping which make some sense,....  I'm trying to find what I need to do get the router ready for M$ NLB.  I've been from forum to forum and read a bunch of CISCO configuration pages but no really getting a clear answer here....  

Our Servers are on VLAN 70 our workstations or 10.  I turned on IGMP Snooping on for VLAN 70... not sure if I'm heading down the right path here....

CR-6509#show ip igmp interface vlan70
Vlan70 is up, line protocol is up
  Internet address is
  IGMP is disabled on interface
  Multicast routing is disabled on interface
  Multicast TTL threshold is 0
  No multicast groups joined by this system
  IGMP snooping is globally enabled
  IGMP snooping CGMP-AutoDetect is globally enabled
  IGMP snooping is enabled on this interface
  IGMP snooping fast-leave (for v2) is disabled
  IGMP snooping querier is enabled. Querier is (this system)
  IGMP snooping explicit-tracking is enabled
  IGMP snooping last member query response interval is 1000 ms
  IGMP snooping report-suppression is enabled
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