Specifications

78 ExtremeWare XOS 11.0 Concepts Guide
Configuring Slots and Ports on a Switch
NOTE
Frames that contain errors are not mirrored.
The monitor port transmits tagged or untagged frames, according to the way you configured the
monitor port. This feature allows you to mirror multiple ports or VLANs to a monitor port, while
preserving the ability of a single protocol analyzer to track and differentiate traffic within a broadcast
domain (VLAN) and across broadcast domains (for example, across VLANs when routing).
NOTE
The monitor port must be explicitly configured for tagged or untagged frames beginning with
ExtremeWare XOS version 11.0.
The traffic egressing the monitor port can be either tagged or untagged. If the mirroring is enabled as
tagged on the monitor port, all traffic egressing the monitor port is tagged. In this case, even if some
untagged ports send mirrored traffic to the monitor port, that traffic also egresses the monitor port as
tagged. And, if mirroring is enabled as untagged on the monitor port, all traffic egressing the monitor
port is untagged, including mirrored tagged packets.
When you upgrade to 11.0, all restored mirroring configurations are tagged on the monitor ports.
Switch Port-Mirroring Rules and Restrictions
This section summarizes the rules and restrictions for configuring switch port mirroring:
• When you disable mirroring, all the filters are unconfigured.
• To change monitor ports, you must first remove all the filters.
• You cannot mirror the monitor port.
• The mirroring configuration is removed when you:
— Delete a VLAN (for all VLAN-based filters).
— Delete a port from a VLAN (for all VLAN-, port-based filters).
— Unconfigure a slot (for all port-based filters on that slot).
• Any mirrored port can also be enabled for load sharing; however, each individual port of the
load-sharing group must be explicitly configured for mirroring.
• You cannot include the monitor port in a load-sharing group.
• The monitor port is automatically removed from all VLANs; you cannot add it to a VLAN.
• The mirroring filters are not confined to a single module.
• You cannot use the management port or the management at all in switch port-mirroring
configurations.