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Cisco Bug: CSCvh85012 - ASA does not forward multicast traffic to the Wireless interface

Last Modified

Sep 16, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases


Description (partial)

After some time or amount of Multicast Traffic destined to the Multicast group Wireless client will stop receiving Multicast messages from that group.

A 'show mroute' will display that you are missing an interface in your 'Immediate Outgoing interface list'. In this case for our (*, you'll be missing your wireless nameif but your wired nameif should remain. You may also see members from the Wired-Client-IP, group have "Null" 'Outgoing interfaces list' as displayed below:

(*,, 00:26:14/never, RP, flags: SCJ
  Incoming interface: Null
  RPF nbr:
  Immediate Outgoing interface list:
    inside, Forward, 00:22:15/never

(Wired-Client-IP,, 00:14:13/00:00:18, flags: SFJT
  Incoming interface: inside
  RPF nbr:
 Outgoing interface list: Null

(Wireless-Client-IP,, 00:23:07/00:03:29, flags: SFJT
  Incoming interface: wifi
  RPF nbr:
  Inherited Outgoing interface list:
    inside, Forward, 00:22:15/never

A 'show mfib' will display that you are missing the wireless interface in your (*, group and (Wired-Client-IP, The (Wireless-Client-IP, group will display both interfaces and have only the A - Accept Flag set as displayed below:

(*, Flags: C K
   Forwarding: 0/0/0/0, Other: 0/0/0
   inside Flags: F NS
     Pkts: 0/0

(Wired-Client-IP, Flags: K
   Forwarding: 0/0/0/0, Other: 58/0/58
   inside Flags: A F
     Pkts: 0/0

(Wireless-Client-IP, Flags: K
   Forwarding: 93/0/103/0, Other: 0/0/0
   wifi Flags: A
   inside Flags: F NS
     Pkts: 88/0

Use the wireless capability of the ASA to allow for communication between wired and wireless clients on Multicast Group
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