Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
Page 352
302
Brocade 6910 Ethernet Access Switch Configuration Guide
53-1002581-01
Local Port Mirroring Commands
14
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 in a completely unobtrusive manner.
•
Set the destination port by specifying an Ethernet interface with the
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.
•
You can create multiple mirror sessions, but all sessions must share the same destination
port.
•
The destination port cannot be a trunk or trunk member port.
•
ACL-based mirroring is only used for ingress traffic. To mirror an ACL, follow these steps:
1. Use the access-list command (
) to add an ACL.
2. Use the access-group command to add a mirrored port to access control list.
3. Use the port monitor access-list command to specify the destination port to which traffic
matching the ACL will be mirrored.
Example
The following example configures the switch to mirror all packets from port 6 to 5:
Console(config)#interface ethernet 1/5
Console(config-if)#port monitor ethernet 1/6 both
Console(config-if)#