6.5.1

Table Of Contents
TSO and LRO
TCP Segmentation Offload (TSO) and large receive offload (LRO) might cause the number of mirroring
packets to not equal to the number of mirrored packets.
When TSO is enabled on a vNIC, the vNIC might send a large packet to a distributed switch. When LRO
is enabled on a vNIC, small packets sent to it might be merged into a large packet.
Source Destination Description
TSO LRO Packets from the source vNIC might be large packets, and whether they are split is determined by
whether their sizes are larger than the destination vNIC LRO limitation.
TSO Any destination Packets from the source vNIC might be large packets, and they are split to standard packets at the
destination vNIC.
Any source LRO Packets from the source vNIC are standard packets, and they might be merged into larger packets
at the destination vNIC.
Create a Port Mirroring Session
Create a port mirroring session by using the vSphere Web Client to mirror vSphere Distributed Switch
traffic to ports, uplinks, and remote IP addresses.
Prerequisites
Verify that the vSphere Distributed Switch is version 5.0.0 and later.
Procedure
1 Select Port Mirroring Session Type
To begin a port mirroring session, you must specify the type of port mirroring session.
2 Specify Port Mirroring Name and Session Details
To continue creating a port mirroring session, specify the name, description, and session details for
the new port mirroring session.
3 Select Port Mirroring Sources
To continue creating a port mirroring session, select sources and traffic direction for the new port
mirroring session.
4 Select Port Mirroring Destinations and Verify Settings
To complete the creation of a port mirroring session, select ports or uplinks as destinations for the
port mirroring session.
Select Port Mirroring Session Type
To begin a port mirroring session, you must specify the type of port mirroring session.
Procedure
1 Browse to a distributed switch in the vSphere Web Client navigator.
vSphere Networking
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