Hello Everyone,   I am sure most of you might have already guessed the topic after looking at the title :)   Well I currently have a task on my plate, where I need to make sure that the Airplay traffic flows between 2 different VLANs, to be exact I have an Airplay Receiver on let's say VLAN 40 and I have a Wireless user on say VLAN 50.    I know that if you have a WLC present in your network, then there are ways to support this scenario. However, in my case I do not have a WLC in the network and my AP is just a basic Linksys one (this is a Lab environment).   Please find my setup below: Nexus 3548 (acting as Core Switch) ---> Port Channel 10 ---> Cisco 2960X  Access Point is connected to Cisco 2960X and I only have 1 SSID (VLAN 50) on this AP. L3 Interfaces for VLAN 40 and 50 are defined on the Nexus 3548. I have IGMP snoooping, IGMP Querier configured and also have pim sparse mode enabled on both VLAN 40 and VLAN 50 to route the multicast traffic.   For my test, I have the receiver connected to VLAN 40 and my iPad is connected to the wireless on VLAN 50. I cannot even see the Airplay Receiver from VLAN 50.   I do know that I am missing something or there is a limitation with my setup but please do let me know your thoughts on this setup and how to make the airplay traffic flow between multiple VLANs without the WLC present in the network.   Thanks, Harsha     ... View more

Hello Everyone, I have a simple setup,                                                     Access Switch 2<-- Port  Channel 20 ----->Core Switch <---- Port Channel 10 --> Access Switch 1 Access Switch 1 connects to the Core Switch using Port Channel 10. Access Switch 2 connects to the Core Switch using Port Channel 20. SVI of the VLAN ( VLAN 20) is configured on the Core Switch and VLAN 20 is allowed on the trunk link connecting both the Access Switches. VLAN 30 is my management VLAN and I have configured 10.20.30.2 IP address on Access Switch 1 and 10.20.30.3 IP address on Access Switch 2. IGMP Snooping (and immediate leave) has been enabled on both the switches. I have enabled igmp querier on both the switches and since 10.20.30.2 is the lowest IP it has been elected as the primary querier. When I run the command " sh ip igmp querier" on Access Switch 1 it displays that Switch is the querier. When I run the command " sh ip igmp querier" on Access Switch 2, it displays that 10.20.30.2 is the querier. Now here comes the problem, I have connected a multicast source (Encoder connected on port gi 1/0/1) and a receiver (Decoder connected on port gi 1/0/2) to Access Switch 2 and both of them are on VLAN 20. When I issue the command " sh ip igmp snooping groups vlan 20", I can see that the receiver is subscribing to the correct multicast address and port gi 1/0/2 is listed in the output. However, Po20 is also listed in the output. I am assuming, this is because the group information is being sent out to the querier through port channel 20. Utilization on the switchport gi 1/0/2 is 800Mbps (which is expected as the multicast source bitrate is set to 800Mbps), but based on the port channel utilization, same 800Mbps is also flowing through the port channel (even though there are no other receivers). This is just one simple case, now imagine if I have 10 sources and 10 receivers (subscribing to different multicast addresses) then my port channel is flooded with 10x800Mbps of multicast traffic. How do I prevent this flooding ?  FYI, I am not running PIM as the traffic is on just VLAN 20. Appreciate any suggestions. Regards, Harsha ... View more