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

Last Modified

Jul 26, 2019

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.8(2)

Description (partial)

Symptom:
Symptoms:
After some time or amount of Multicast Traffic destined to the Multicast group 231.33.30.33 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 (*, 231.33.30.33) you'll be missing your wireless nameif but your wired nameif should remain. You may also see members from the Wired-Client-IP, 231.33.30.33) group have "Null" 'Outgoing interfaces list' as displayed below:

(*, 231.33.30.33), 00:26:14/never, RP 0.0.0.0, flags: SCJ
  Incoming interface: Null
  RPF nbr: 0.0.0.0
  Immediate Outgoing interface list:
    inside, Forward, 00:22:15/never

(Wired-Client-IP, 231.33.30.33), 00:14:13/00:00:18, flags: SFJT
  Incoming interface: inside
  RPF nbr: 192.168.1.16
 Outgoing interface list: Null

(Wireless-Client-IP, 231.33.30.33), 00:23:07/00:03:29, flags: SFJT
  Incoming interface: wifi
  RPF nbr: 192.168.10.7
  Inherited Outgoing interface list:
    inside, Forward, 00:22:15/never

A 'show mfib' will display that you are missing the wireless interface in your (*,231.33.30.33) group and (Wired-Client-IP,231.33.30.33). The (Wireless-Client-IP,231.33.30.33) group will display both interfaces and have only the A - Accept Flag set as displayed below:

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

(Wired-Client-IP,231.33.30.33) Flags: K
   Forwarding: 0/0/0/0, Other: 58/0/58
   inside Flags: A F
     Pkts: 0/0

(Wireless-Client-IP,231.33.30.33) Flags: K
   Forwarding: 93/0/103/0, Other: 0/0/0
   wifi Flags: A
   inside Flags: F NS
     Pkts: 88/0

Conditions:
Use the wireless capability of the ASA to allow for communication between wired and wireless clients on Multicast Group 231.33.30.33
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