cisco-wlc环境下的airplay

Enterprise and Apple have this love/hate relationship. End users love Apple. IT tends to be hesitant in supporting the awesome features they come with. AirPlay is probably the most requested feature. Cisco didnt officially support Bonjour and AirPlay until version 7.4 in the Wireless LAN Controller. The latest revisions have improvements in supporting Bonjour and especially in the configuration.In this post I will discuss configuration on the Cisco WLC version . What configuration is needed on your switches and how you can verify Bonjour is working. Well get it working for devices on the same subnet and across different subnets, both wired and wireless.I was able to test this with multiple iPads and a handful of iPhones. With 3rd party software I was able to use my Windows 8 laptop to AirPlay my screen to an Apple TV. No lag or jitter was encountered during my tests. To be fair, I do not have a lot of users hitting the wireless network to really see any performance hits.Before configuring Bonjour, I performed awireless site surveyand made adjustments to provide proper coverage for connectivity and ensured there was no interference.Cisco Wireless LAN Controller RequirementsTo allow Bonjour to traverse the wireless network there will need to be some features enabled: mDNS Broadcast forwarding Multicast IGMP snoopingBroadcast ForwardingWithin the Cisco WLC interface, click onControllerand ensure youre in theGeneralsection. From this section, ensureBroadcast Forwarding is Enabled. This was required by one of our vendors. We use Savant AV equipment and to manage those devices, and to also allow Bonjour, we had to enable this feature. This is a global feature of the wireless LAN controller.Additionally, change theAP Multicast Mode to Multicastand set a multicast address. When selecting a multicast address, pick one from theprivate multicast address space.Click for a larger imageOn the left pane, expand mDNS and click on General. In this window,enable mDNS Global Snooping. The Cisco WLC will enable some services for you. Depending on your needs for Bonjour, youll either add or remove services.To add a service, click on the drop down for “Select Service”, select the service required, enable Query Status, and then click Add.To remove an existing service, hover your mouse over the blue arrow icon and select Remove.Enabling mDNS Click for Larger ImageMoving on to Domain Names you will see a list of entries from devices currently communicating via Bonjour. Seeing devices in this section is a good sign.Click for LargerNotice the “Type” column. Initially, you probably will see only Wireless devices. In order to see Wired devices you must create an interface on the WLC within each subnet needing access to Bonjour services. Within that interface configuration the mDNS Profile should also be selected.Creating an Interface in the wired subnetSet the mDNS Profile for the InterfaceAnother location to configure the mDNS Profile is within the WLAN Advanced Settings. Enabled the mDNS profile for the WLAN.mDNS Browser is a handy tool to view what the controller can find on the network and what service string they are using.Switch ConfigurationFirst feature that must be enabled is multicast. Use this command on your switch to enable multicast:ip multicast-routingNext configuration item is to enter the VLAN interface and configure the sparse mode:interface vlan vlan-idip pim sparse-modeThe main command is ip pim sparse-mode. What this command does is allow the SVI to join in sparse mode multicast traffic. The clients in that VLAN will be able to receive multicast traffic from different multicast groups. Sparse mode uses a pull model to deliver multicast traffic.You can read more about Sparse Mode and the other modes onC:PIM-SM uses a pull model to deliver multicast traffic. Only network segments with active receivers that have explicitly requested the data will receive the traffic.PIM-SM distributes information about active sources by forwarding data packets on the shared tree. Because PIM-SM uses shared trees (at least, initially), it requires the use of a rendezvous point (RP). The RP must be administratively configured in the network.Sources register with the RP and then data is forwarded down the shared tree to the receivers. The edge routers learn about a particular source when they receive data packets on the shared tree from that source through the RP. The edge router then sends PIM (S, G) join messages towards that source. Each router along the reverse path compares the unicast routing metric of the RP address to the metric of the source address. If the metric for the source address is better, it will forward a PIM (S, G) join message towards the source. If the metric for the RP is the same or better, then the PIM (S, G) join message will be sent in the same direction as the RP. In this case, the shared tree and the source tree would be considered congruent.After configuring the sparse mode for the SVI, we now enable IGMP snooping on the switch with this command:ip igmp snooping vlan vlan-idVerify IGMP snooping with:show ip igmp snoopingSDG01-SVRM-CSW-3750-01#show ip igmp snooping Global IGMP Snooping configuration: - IGMP snooping : Enabled IGMPv3 snooping (minimal) : Enabled Report suppression : Enabled TCN solicit query : Disabled TCN flood query count : 2 Last Member Query Interval : 1000Vlan 1: - IGMP snooping : Enabled IGMPv2 immediate leave : Disabled Explicit host tracking : Enabled Multicast router learning mode : pim-dvmrp Last Member Query Interval : 1000 CGMP interoperability mode : IGMP_ONLYCommands used to verify mDNS on the Cisco WLC:show mdns profile summary show mdns profile detail show mdns service summary show mdns service detail show interface det show interface group detail show wlan show client detail show network summaryclear mdns service-database debug mdns message debug mdns details debug mdns error debug mdns all Caveats NoticedSometimes I noticed reconnecting to the wifi network fixes any problems with connecting to Bonjour-enabled devices.For printing, Ive read that you must use a printer supported by Apple. So far I havent been able to get printing done successfully but I am unsure if its because I dont have a printer on Apples list. This is after finding that the printer does support Bonjour.My ThoughtsCisco has a couple of different guides scattered arou