Multicast vlan feature

In traditional multicast on-demand mode, if users in different VLANs require the same multicast flow, an upstream device of a Layer 3 device must send a copy of the multicast flow for each user. This mode wastes bandwidth and imposes additional burdens on the upstream device.

The multicast VLAN function can be used to address this problem. With the help of IGMP snooping, the multicast VLAN function moves the multicast replication point downstream to an edge device, so that only one multicast flow is replicated on an upstream device for different VLANs that require the same flow.

The PE no longer needs to send identical multicast data flows downstream.

multicast vlan feature

This mode saves network bandwidth and relieves the load on the PE. This reduces network-side bandwidth consumption on the CE and performance pressure on the PE. A multicast VLAN is used to aggregate multicast flows. After receiving a multicast data packet from an upstream device, a Layer 2 device searches its multicast forwarding table for a matching entry.

A user VLAN allows you to configure the querier election function. The following uses the network shown in Figure as an example to describe the querier election function. To address this problem, configure querier election on Router B and Router C in the user VLAN and specify one of them to send Query messages and forward multicast data flows. A querier is elected as follows in a user VLAN the network shown in Figure is used as an example :. Multicast VLAN Background In traditional multicast on-demand mode, if users in different VLANs require the same multicast flow, an upstream device of a Layer 3 device must send a copy of the multicast flow for each user.

Multicast data forwarding After receiving a multicast data packet from an upstream device, a Layer 2 device searches its multicast forwarding table for a matching entry. If a matching forwarding entry exists, the Layer 2 device will identify the downstream ports and their VLAN IDs, replicate the multicast data packet on each downstream port, and send a copy of the packet to user VLANs. If no matching forwarding entry exists, the Layer 2 device will discard the multicast data packet.

The querier function is enabled on Router B and Router C. Benefits The multicast VLAN function offers the following benefits: Reduced bandwidth consumption Reduced workloads for Layer 3 devices Simplified management of multicast sources and multicast group members.Within the same VLAN, a ping to You are using So I tried to give it a go with the WLC What should I say, it works like a charm, even with rules that one vlan can see both Airplay devices they are in different vlans and another vlan can only one of the Airplay devices.

The bad thing on it is, not everything can be done from the GUI, so it is half doing it in GUI and half in shell or completely in shellso please Cisco do not start like Microsoft!! Either doing everything in the GUI or shell but not a mix!

If some one is interested in how I realized it, feel free to post it or send me a messages and I will post the configuration. Hello Thorsten, as mentioned by Mikael the mcast address range Examples of this are like OSPF which uses These are not to be routed. Mikael seems to be suggesting you can change the multicast address being used by Bonjour in which case that would be a solution.

The issue as pointed out is that Bonjour uses a I haven't needed to do this myself but most definitely you aren't the only one and yes it is problematic. Have a read of this link which apparently shows you how to get it working. It's also worth reading the comments section at the end as there are a number of doubts as to whether it does work but the author says he has it working on a production network.

Jon, you are right you can not change the way how Bonjour is advertising its services, I opend up a Cisco TAC 2 weeks ago and all I heard from all 4 Engineers working on it was "It should work now. THe strange thing is, that I did the same stuff on other projects but with different Cisco hardware. We used a instead of the Nexus and all I had to was enable multicast routing with. If you do a sh ip mroute then you can see outgoing interface vl and joined into the Maybe I found another solution without the need of having multicast routing configured, I will try a Bonjour proxy based on Linuk called avahi.

I tryed it at home yesterday and it was working perfectly but I can ealiest test it out on thursday. Thanks for all the answers, I will give it a try with the Bonjour proxy and will post it if works out or not. Buy or Renew. Find A Community. We're here for you! Turn on suggestions. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

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Showing results for. Search instead for. Did you mean:. Labels: LAN Switching. I have this problem too. Rising star. Try with addresses in the Sorry for the late response. Sorry for the late response, it were very 8 busy weeks! I trieed the Bonjour proxy, which worked fine, but I was not really happy with it. Thanks for all the help guys!! Bilal Nawaz.Maithri B. She has four years of experience and has worked on a wide range of Cisco wireless products and technology such as autonomous IOS aIOS access points, wireless LAN controllers, wireless VoIP phones, wireless control systems, network control systems, and mobility services engines.

She has also worked in LAN switching technology. There are some new features added in the newer releases for optimization of multicast but those have not been explained in this webcast. The reason is because we want to avoid the multicast traffic on one controller flooding to all other controllers and APs in the network. However enabling multicast-unicast mode will overload the WLC depending on the number of clients and APs as it has to replicate each packet into a unicast and send it to each AP.

This consumes lot of processing power on the controller. All the APs that register to the controller are automatically a part of this group. Each controller should have its own Multicast group IP. The APs will then discard the packets if there are no clients requesting for the mcast traffic. This behavior cannot be modified. This also ensures that L2 multicast is allowed. However it is not necessary that video streaming should be enabled to support multicast.

Enabling video streaming will ensure reliable delivery of multicast however is not a mandatory option. Q: For that last answer, any clues as to when the 7. I currently have two solutions in place in order to multicast across vlans, just wanted to know when the code will be released?

Smaller switches can function with only "ip multicast-routing" enabled.

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In Multicast-Unicast mode, each multicast packet is converted into a unicast packet and flooded to all the APs registered on that controller. Hence it is more CPU intensive and adds overhead on the controller. It was just getting uploaded on CCO when you checked. One such tool is attached to this FAQ. Any of these can be used for troubleshooting.

multicast vlan feature

The best way to analyze mcast traffic would be to take a packet capture on client and span capture from switchport going to WLC. Video streaming, file sharing applications etc need multicast enabled on WLC. If multicast is not enabled, BYOD devices will still connect to WiFi network but lot of applications that use multicast over wireless will not function. This can be used for testing, should not be an issue.

These users might be using most of the Bonjour based applications on Apple like Airplay, Airprint etc. Enabling multicast on wireless will ensure that these devices are able to discover each other via wireless without any issues. On the newer platforms likeWiSM2 etc we have fastpath enabled on the controller that allows data switching at the forwarding plane.

Once a client stops requesting for mcast traffic, the client entry will be present on the WLC till the IGMP timeout value expires and then the client entry gets deleted. The default value is 60 secs. The end clients are not aware of this IP.Prior to the 7. Since the WLAN is still the same for all clients, multiple copies of the multicast packet are sent over the air.

To suppress the duplication of a multicast stream on the wireless medium and between the controller and access points, you can use the multicast optimization feature.

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Multicast optimization enables you to create a multicast VLAN which you can use for multicast traffic. Clients are allowed to listen to a multicast stream on the multicast VLAN. Therefore, the multicast packets that are sent out over the air is just one stream. The Multicast Interface drop-down list appears. Click Apply.

Passive clients are wireless devices, such as scales and printers that are configured with a static IP address. These clients do not transmit any IP information such as IP address, subnet mask, and gateway information when they associate with an access point. Upon receiving an ARP request, the controller responds with an ARP response instead of passing the request directly to the client.

This scenario has two advantages:. The upstream device that sends out the ARP request to the client will not know where the client is located.

Understanding “VLAN Select” Feature

Power for battery-operated devices such as mobile phones and printers is preserved because they do not have to respond to every ARP requests. Since the wireless controller does not have any IP related information about passive clients, it cannot respond to any ARP requests.

The current behavior does not allow the transfer of ARP requests to passive clients. Any application that tries to access a passive client will fail. The passive client feature enables the ARP requests and responses to be exchanged between wired and wireless clients. This feature when enabled, allows the controller to pass ARP requests from wired to wireless clients until the desired wireless client gets to the RUN state. GARP forwarding must to be enabled using the show advanced hotspot command.

To configure passive clients, you must enable multicast-multicast or multicast-unicast mode. The Multicast Group Address text box is displayed. Enable global multicast mode as follows:. Check the Enable Global Multicast Mode check box. Enable multicasting on the controller by entering this command:.

The default value is disabled. Configure the controller to use multicast to send multicast to an access point by entering this command:.The document also discusses how to deploy this feature in a Cisco Unified Wireless Solution. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared default configuration.

If your network is live, make sure that you understand the potential impact of any command. Refer to Cisco Technical Tips Conventions for more information on document conventions.

Default mapping is to management interface.

multicast vlan feature

This limitation requires availability of a single large subnet, in dense deployments, which might not be feasible for many customers because of existing network design and IP subnet allocation in their network. Existing features, such as AP Groups and AAA override, can help to some extent but cannot meet complete requirements and might not be feasible in all kinds of customer deployments. This same limitation also exists to the guest anchor setup where guest clients on remote locations always get an IP address from a single subnet mapped to the WLAN on anchor location.

Also, the IP address assignment to wireless guest clients is not dependent on foreign locations and all guest clients on different foreign locations will receive an IP address from the same subnet. Once again, this is not feasible for many customers. Wireless clients associating to this WLAN will receive an IP address from a pool of subnets identified by a MAC hashing algorithm which is calculated based on the MAC address of the client and the number of interfaces in the interface group.

In the instance that the interface selected from the interface group by the MAC hashing algorithm does not serve the IP address to the client for some reason dhcp server unreachable, dhcp scope exhausted, etc.

This flowchart illustrates the DHCP address selection when the round robin mechanism is used in interface or interface group configuration:. Therefore, sometimes a L3 mobility is performed where L2 mobility could have been done. If client has a static IP configured in subnet A and is allotted subnet B, the client is moved to subnet A override before moving to RUN state, if these conditions are met:. Otherwise, the static IP client cannot pass traffic.

Same Subnet Mobility —In the current solution, when a client roams from one Controller to another, the foreign sends the VLAN information as part of the mobility Announce message. If the same VLAN is available on the Foreign, then the client context is completely deleted from the Anchor and the Foreign becomes the new Anchor Controller for the client.

Cisco Wireless Controller Configuration Guide, Release 8.5

It is ensured that the inter-release mobility does not get affected because of the introduction of this feature. Multicast at present is based on the grouping of the multicast address and the VLAN as one entity, mgid. The VLAN pooling feature has the potential of increasing the duplicate packets on the air. Therefore, the upstream router sends one copy for each VLAN. This results, in the worst case, as many copies because there are VLANs in the pool.

Because the WLAN is still the same for all clients, multiple copies of the multicast packet are sent on the air. Integration of the VLAN select feature also introduces some issues in current multicast architecture where wireless clients can receive duplicate packets.

The issue of receiving duplicate multicast packets was already present in current multicast architecture, but it was only visible when AAA override is configured and 2 clients on different subnet one on WLAN mapped subnet and another on overridden subnet listen to same multicast group.

This VLAN is used for multicast traffic. Clients will be allowed to listen to a multicast stream on the multicast VLAN.

pfSense Multicast, Apple TVs, Avahi, Bonjour

Therefore, the multicast packets sent out on the air will be just one stream.In this case, the two VLANs can share the same service stream channel. In this case, the two VLANs use different service stream channels.

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Static configuration of multicast programs is not supported. Priority of forwarding IGMP packets by the upstream port. Run the igmp uplink-port command to configure the multicast upstream port. The packets of the MVLAN corresponding to the upstream port are forwarded and received by this upstream port. Run the igmp mode command to select the Layer 2 multicast mode. By default, the multicast mode is disabled. By default, IGMPv3 is enabled in the system. In this case, if a user is online, the system will force the user to go offline.

Run the igmp priority command to change the priority for forwarding the IGMP packets by the upstream port. By default, the priority is 6 and does not need to be changed.

The priority of the service stream is set through the traffic profile. Run the display igmp config vlan command to query the attributes of the multicast VLAN. Run the igmp match mode command to set the multicast program configuration mode. Configure the multicast upstream port. Select the multicast mode. Set the IGMP version.

Multicast upstream port mode.

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Layer 2 multicast protocol. IGMP version.Reduces the bandwidth required to distribute IPTV multicast streams by eliminating duplication of multicast streams from the same source to interested receivers on different VLANs. This reduces the bandwidth needed to forward the traffic.

When MVR is configured on a device, the device receives only one copy of each MVR multicast stream, and then replicates the stream only to the hosts that want to receive it, while forwarding all other types of multicast traffic without modification.

Starting in Junos OS Release Where applicable, the following sections explain these differences. Both modes enable MVR to forward only one copy of a multicast stream to the Layer 2 network. However, the main difference between the two modes is in how the device sends IGMP reports upstream to the multicast router. The device essentially handles IGMP queries the same way in either mode. The upstream router that sent the queries on the MVLAN does not receive the replies and does not forward any traffic, so to solve this problem, you must configure static membership.

As a result, we recommend that you use MVR proxy mode instead of transparent mode on the device that is closest to the upstream multicast router. General IGMP snooping proxy operation is not supported. See the translate option at the [edit protocols igmp-snooping vlans vlan-name data-forwarding receiver ] hierarchy level. Based on the access layer topology of your network, the following sections describe recommended ways you should configure MVR on devices in the access layer to smoothly deliver a single multicast stream to subscribed hosts in multiple VLANs.

In this configuration, the upstream router would require two integrated routing and bridging IRB interfaces to send two copies of the multicast stream to the device, which then would forward the traffic to the receivers on the two different VLANs on INTF-2 and INTF The device does not have translation enabled on v20, and forwards untagged multicast packets on access port INTF Without MVR, similar to the single-tier access layer topology, the upper device connects to the upstream multicast router using a multicast router interface that is also a trunk port in both receiver VLANs.

The two layers of devices are connected with trunk ports in the receiver VLANs. The lower device has trunk or access ports in the receiver VLANs connected to the multicast receiver hosts. In this configuration, the upstream router must duplicate the multicast stream and use two IRB interfaces to send copies of the same data to the two VLANs.

The upstream device also sends duplicate streams downstream for receivers on the two VLANs. The device in the uppermost tier connects to the upstream multicast router with a multicast router interface and a trunk port in the MVLAN.