microsoft nlb multicast static arp juniper

Without this ARP entry, the switch would not forward a packet with a destination IP address 10.0.36.28 from another subnet and the switch would not be able to reach it itself.įor the most part, what we are trying to do is limit the nasty habit of flooding multicast packets out all ports.The IGMP snooping command limits it to an interface (or 2 if configured that way) and the configured multicast ip address is installed into the table as a multicast mac address. That's what the static ARP entry is for since it will not learn a multicast mac address with a unicast ip address dynamically. This bridges Layer 3 (IP header) to Layer 2 (ethernet header) and allows a hardware forwarding entry to be created. MLB does not use this to transmit packets only to receive them.įor packets trying to reach the destination IP address 10.0.36.28, the switch first needs an ARP entry. The configuration we discussed does nothing for mac flapping on 2 different ports. This will cause the switch to update its mac address table with each new packet on each port coming from the server. Typically a server with 2 NICs plugged into the same switch will be misconfigured to send packets using the same source mac address on both NICs. We have to separate what the switch has to do for packets to reach 10.0.36.28 and what the switch has to do for packets from incoming ports.įor packets coming into the switch, a mac address will flap if the switch sees this source mac address coming in on 2 different ports. I am about to add the following command to 5k switch, but want to know if these commands might make it work. I am able to ping NBL cluster host Ip address 10.156.2.132 but nobody else who are on other VLANs (subnets) 101,102,103,104,105 and vlan 50 (wireless subnet). Since my computer is connected via a static ip address and via Vlan1 port. Note: Many users out there are experiencing the same issue we are having now.īelow are some links regarding configuring NLB on Cisco switch with Microsoft and VMware:Īm I missing anything here that is stopping me from entering these commands? it bounced back with 'unrecognized command error'. I tried to add the above commands into either 5k and 7k. Here is the command requested by our consultant. Our exchange consultant insisted us to add the following command into either 5k or 7k to allow NLB multicast traffic passing through to all end users hosts. Their physical VMware hosts are directly connected to 2k switches on port eth101/1/33-36. We are implementing Microsoft NLB (network load balancing) on our CAS servers (Client Access servers). We are in the process of migration our email exchange servers from 2003 to 2010. We need your expertise to help us clarify the NLB configuration on our 5k or 7k switches.

Microsoft nlb multicast static arp juniper