Chapter 13
| Port Mirroring Commands
Local Port Mirroring Commands
– 382 –
rx - Mirror received packets.
tx - Mirror transmitted packets.
both - Mirror both received and transmitted packets.
vlan-id - VLAN ID (Range: 1-4094)
mac-address - MAC address in the form of xx-xx-xx-xx-xx-xx or
xxxxxxxxxxxx.
acl-name – Name of the ACL. (Maximum length: 16 characters, no spaces or
other special characters)
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 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.
◆ When mirroring traffic from a port, the mirror port 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 mirroring are both enabled, the target port can
receive a mirrored packet twice; once from the source mirror port 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.
◆ Note that Spanning Tree BPDU packets are not mirrored to the target port.
◆ When mirroring VLAN traffic or packets based on a source MAC address, the
target port cannot be set to the same target port as that used for basic port
mirroring.
To Next Page
Loading...
