Support for 1:N virtualization after a CSS is set up

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1:N virtualization is not supported after a CSS is set up.

Other related questions:
How do S series modular switches establish a CSS
How to configure port mirroring on S series switches after they set up a stack or CSS
If multiple S series switches (except S1700 switches) set up a stack or cluster, mirroring is configured in the same way as that before the stack or CSS is set up. Take a cluster of modular switches as an example. To copy packets on mirrored port GE1/1/0/1 to observing port GE2/2/0/0, configuring port mirroring as follows: 1. Configure GE2/2/0/0 as an observing port. [Switch] observe-port 1 interface gigabitethernet 2/2/0/0 2. Copy the packets received and sent by mirrored port GE1/1/0/1 to the observing port. [Switch] interface gigabitethernet 1/1/0/1 [Switch-GigabitEthernet1/1/0/1] port-mirroring to observe-port 1 both [Switch-GigabitEthernet1/1/0/1] quit

Is inter-chassis link aggregation supported after a stack of CE switches is set up
Yes It is recommended that the stacked switch connect to the upstream and downstream devices using inter-chassis link aggregation to ensure link reliability.

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