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[QFX] Multicast stream stops or gets dropped before reaching the receivers

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Article ID: KB34177 KB Last Updated: 22 May 2019Version: 1.0
Summary:

Do you have a multicast stream in which it's stopping before getting to the receivers?  Do you have a full (S,G) on some devices, but the further you get from source you only have (*,G)?

Solution:

Check the TTL that is being sent.  Some encoders may not send or may not be configured to send a full TTL.  If this is the case, the TTL might be expiring before getting to the receiver.

Either check the configuration on the encoder (Source) or take a inline packet capture to check the TTL being sent.

Best way to check the TTL of packets would be to create a port analyzer that would send the mirrored traffic out a specific interface.  Connected to that interface would be a device that can do a full packet capture.

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