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Hall of Fame Expert

Re: Multicast Routing and IPTV Question

Hello Brad,

the bug description mentions that applies only to a stack of C3850 acting at OSI Layer 2 only

 

>> Seen only on member switches in a 3850 stack

 

Is your switch member of a stack or is it a standalone  switch ?

Also your device is a Layer3 device performing routing both unicast and multicast from your description, so I am not sure that this bug applies to your network.

 

Hope to help

Giuseppe

 

Beginner

Re: Multicast Routing and IPTV Question

Hi,

 

We have a stack of 3850 SFP switches as the core and then two stacks of 3850 as access layer in Layer 2 mode. 

 

The receivers are attached to the layer 2 switches. We didn’t have any Copper SFPs to test being connected to core directly to test either. 

 

Brad

Hall of Fame Expert

Re: Multicast Routing and IPTV Question

Hello Brad,

with this more detailed description I agree the bug may apply to your issue.

 

 

Hope to help

Giuseppe

 

Beginner

Re: Multicast Routing and IPTV Question

Hi, 

 

Just to get some closure, Cisco TAC came back after some investigations and found this bug - 

 

CSCvn31653.

 

They recommend a upgrade to Fuji Code - 16.9.3a

 

Thanks again for your help. 

 

Brad

Highlighted
Hall of Fame Expert

Re: Multicast Routing and IPTV Question

Hello Brad,

you have been kind to provide feedback on this strange issue with multicast.

 

I have given a read to the bug description

 

Fed is showing incorrect or is missing IGMP Snooping groups entries on Cat9300/Cat3850/Cat3650 switch.

Example:
Problematic group 225.x.x.x, receiver behind the gig 2/0/3 is present in "show ip igmp group" but not in the "fed" outputs

 

None of the suggested workarounds is a sure way to solve the issue so an IOS XE upgrade is necessary.

 

>> Workaround:
- shut/no shut of port that is missing may help to recover
- disabling igmp snooping and enabling it back may help to recover
- clear ip igmp snooping group may help to recover
- reload

 

The bug is classified as severity 1

 

Last Modified:
Sep 4,2019
Status:
Fixed
Severity:
1 Catastrophic

 

Hope to help

Giuseppe

 

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