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Community Manager

Ask Me Anything- Understanding How Multicast Works with Cisco Cisco Wireless LAN Controllers

This topic is a chance to discuss more about the foundation to understand how multicast works when using Cisco Wireless LAN Controllers (WLCs). In addition, experts will cover questions about the best practices to identify and troubleshoot common issues when multicast is not working properly on Cisco Wireless LAN Networks, from the clear symptoms and common scenarios to their unique challenges and the best practices to mitigate them. others.

To participate in this event, please use the Join the Discussion : Cisco Ask the Expertbutton below to ask your questions

Ask questions from Tuesday 19th to Friday 22th of November, 2019

Featured Experts
estef.jpgEstefania Pacheco is a Technical Consulting Engineer on the Wireless team at the Customer Experience (CX) Center. She provides top-level technical support for worldwide customers using Cisco wireless products. Previously she worked as a Network Engineer with Cisco Advanced Services, solving customer challenges, compatibility issues, and reviewing network designs. Estefania holds a bachelor’s degree in Telecommunications Engineering from the Universidad Nacional Autonoma de Mexico (UNAM). She holds a CCNP R&S certification.

jhosbell.pngJhosbell Verdesca currently works as a Customer Success Specialist focused on Enterprise Networks, Cisco DNA Center, and SD-Access. Before his current position, he worked as a Cisco Support Enginner for the Wireless Team at Cisco’s Technical Assistance Center (TAC) in Mexico for three years. Prior to joining Cisco, he worked for three years with a Cisco Gold Partner in Venezuela, implemenenting and supporing solutions in the Routing, Switching, and Security areas. Jhosbell holds a bachelor’s degree in Telecommunications Engineering from the Universidad Catolica Andres Bello (UCAB) in Caracas, Venezuela. He holds two CCIE certifications, one in Wireless and one in Routing & Switching (#58023).

 

Estefania and Jhosbell might not be able to answer each question due to the volume expected during this event. Remember that you can continue the conversation on the Wireless community.

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Community Manager

Thanks for providing this valuable session Estefania & Jhosbell, please help to answer the remaining questions

  • What happens to the Multicast traffic if “Multicast Mode” is Multicast and Global Multicast is disabled?
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In this case the multicast traffic is not forwarded since Multicast is not enabled in the WLC. This scenario is not supported, please refer: "Table 1. Platform Support for Global Multicast and Multicast Mode"

https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/81671-multicast-wlc-lap.html#anc8

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Community Manager

On the WLC \Controller\General page, what are "AP Multicast Mode" and "Multicast Group Address" used for?

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AP multicast mode is the multicast method that the controller uses in order to transport the multicast packets over CAPWAP to all or several access points at the same time. The controller performs multicasting in two modes, unicast and multicast. For further details refer: https://www.cisco.com/c/en/us/support/docs/wireless-mobility/wireless-lan-wlan/81671-multicast-wlc-lap.html#anc4

 

The multicast group address is used in case you choose AP multicast mode as "Multicast". When you enable multicast mode on the controller, you must also configure a CAPWAP multicast group address. APs subscribe to the CAPWAP multicast group using IGMP. When you enable multicast mode and the controller receives a multicast packet from the wired LAN, the controller encapsulates the packet using CAPWAP and forwards the packet to the CAPWAP multicast group address.

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Community Manager

thanks for helping to cover the remaining questions @espachec 

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