ECS3510-26P_Management Guide R02

C HAPTER 28 | Port Mirroring Commands
Local Port Mirroring Commands
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tx - Mirror transmitted packets.
both - Mirror both received and transmitted packets.
vlan-id - VLAN ID (Range: 1-4093)
mac-address - MAC address in the form of xx-xx-xx-xx-xx-xx or
xxxxxxxxxxxx.
DEFAULT SETTING
◆ No mirror session is defined.
◆ When enabled for an interface, default mirroring is for both received
and transmitted packets.
◆ When enabled for a VLAN or a MAC address, mirroring is restricted to
received packets.
COMMAND MODE
Interface Configuration (Ethernet, destination port)
COMMAND USAGE
◆ You can mirror traffic from any source port or trunk to a destination
port for real-time analysis. You can then attach a logic analyzer or
RMON probe to the destination port and study the traffic crossing the
source port or trunk in a completely unobtrusive manner.
◆ Set the destination port by specifying an Ethernet interface with the
interface configuration command, and then use the port monitor
command to specify the source of the traffic to mirror. Note that the
destination port cannot be a trunk or trunk member port.
◆ When mirroring traffic from a port or trunk, the mirror port/trunk and
monitor port speeds should match, otherwise traffic may be dropped
from the monitor port. When mirroring traffic from a VLAN, traffic may
also be dropped under heavy loads.
◆ When VLAN mirroring and port or trunk mirroring are both enabled, the
target port can receive a mirrored packet twice; once from the source
mirror port or trunk and again from the source mirror VLAN.
◆ When mirroring traffic from a MAC address, ingress traffic with the
specified source address entering any port in the switch, other than the
target port, will be mirrored to the destination port.
◆ Spanning Tree BPDU packets are not mirrored to the target port.
◆ You can create multiple mirror sessions, but all sessions must share the
same destination port.