Working more and more with that feature - very powerfull!
But what about if the packet which needs to be mirrored is at maximum mtu ?
Then the switch is not able to build GRE header around this !
Packets are silently dropped!
That’s very bad for an analysis tool.
Does it help to enable jumbo frames from mirror switch to mirror destination ?
But careless if it would work that’s not practicable in the field.
See here an example:
big data packets are silently dropped - only ACK are seen
Just a short like what the cisco guys do …
They support truncation:
Configures the MTU size for truncation.AnySPAN packet that is larger than the configured mtu size is truncated to the configured size with a 4-byte offset.
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