Mellanox MLNX-OS User Manual for SX1018HP Ethernet Managed Blade Switch
Rev 2.10
Mellanox Technologies
527
Mellanox Technologies Confidential
Packets can be forwarded to any destination using the command
destination interface
.
The analyzer port supports status and statistics as any other port.
LAG
The destination interface cannot be a member of LAG when
the header format is loca
l.
Control Protocols
The destination interface may also operate in part as
a standard port, receiving and sending out
non-mirrored traffic. When the header format is configured as a local port, ingress control proto-
col packets that are received by the local analyzer port get discarded.
Advanced MTU Considerations
The analyzer port, like its counterparts, is subject to MTU configuration. It does not s
end packets
longer than configured.
When the analyzer port sends encapsulated traffi
c, the analyzer traffic has additional headers and
therefore longer frame. The MTU must be configured to support the additional length, otherwise,
the packet is truncated to the configured MTU.
The system on the receiving end of the analyzer port must
be set to handle the egress traffic. If it
is not, it might discard it and indicate this in its statistics (packet too long).
5.11.1.3 Header Format
Ingress traffic from the source interface can be man
ipu
lated in several ways depending on the
network layout using the command
header-format
.
If the analyzer system is directly connecte
d to the destination interface, then the only parameters
that can be configured on the port are the MTU, speed and port based flow control. Priority flow
control is not supported is this case. However, if the analyzer system is indirectly connected to
the destination interface, there are two options for switching the mirrored data to the analyzer
system:
• A VLAN tag may be added to the Ethernet header of the mirrored traffic
• An Ethernet header can be added with include
a
new destination address and VLAN tag
It must be taken into account that adding headers increases packet size.