Configuring Mirroring

Mirroring and Remote Mirroring Configuration

Mirroring is a feature for switched port analyzer. The administrator can use the Mirroring to debug network problems. The selected traffic can be mirrored or copied on a destination port where a network analyzer can be attached to analyze the network traffic.

Remote Mirroring is an extend function of Mirroring. It can extend the destination port in other switch. So the administrator can analyze the network traffic on the other switches.

If a frame is mirrored by more than one mirror probe, then the highest numbered probe is selected. This implies that only one mirror copy is made per frame even if multiple probes are active.



  • Mode: Enables or disables the mirror or Remote Mirroring function.

  • Type: Selects switch type.

    • Mirror: The switch is running on mirror mode. The source port(s) and destination port are located on this switch.

    • Source: The switch is a source node for monitor flow. The source port(s) and intermediate port(s) are located on this switch.

    • Intermediate: The switch is a forwarding node for monitor flow and the switch is an option node. The object is to forward traffic from source switch to destination switch. The intermediate ports are located on this switch.

    • Destination: The switch is an end node for monitor flow. The destination port(s) and intermediate port(s) are located on this switch.

  • VLAN ID: The VLAN ID points out where the monitor packet will copy to. The default VLAN ID is 200.

  • Option for Inner Tagged: Select an inner tagged or an inner untagged type.

Source VLAN(s) Configuration: The switch can supports VLAN-based Mirroring. If you want to monitor some VLANs on the switch, you can set the selected VLANs on this field.

Note

The Mirroring session shall have either ports or VLANs as sources, but not both.

Port Configuration: The following options are used for port role selecting:

  • Port: The logical port for the settings contained in the same row. The CPU also can be selected

  • Source: Selects mirror mode.

    • Disabled: Neither frames transmitted nor frames received are mirrored.

    • Both: Frames received and frames transmitted are mirrored on the Intermediate/Destination port.

    • Rx only: Frames received on this port are mirrored on the Intermediate/Destination port. Frames transmitted are not mirrored.

    • Tx only: Frames transmitted on this port are mirrored on the Intermediate/Destination port. Frames received are not mirrored.

  • Intermediate: Select intermediate port. This checkbox is designed for Remote Mirroring. The intermediate port is a switched port to connect to other switch. All packets that are going through intermediate port will be tagged when the rmirror function is enabled.

    Note

    The intermediate port needs to disable MAC Table learning.

  • Destination: Select destination port. This checkbox is designed for mirror or Remote Mirroring. The destination port is a switched port that you receive a copy of traffic from the source port.

    Note
    On mirror mode, the device only supports one destination port.

    Note
    The destination port needs to disable MAC Table learning.

Configuration Guideline for All Features

When the switch is running on Remote Mirroring mode, the administrator also needs to check whether or not other features are enabled or disabled. All recommended settings are described as follows.

Feature

Impact

source port

intermediate port

destination port

Remote Mirroring VLAN

arp_inspection

High

* disabled

acl

Critical

* disabled

* disabled

dhcp_relay

High

* disabled

dhcp_snooping

High

* disabled

ip_source_guard

Critical

* disabled

* disabled

ipmc/igmpsnp

Critical

un-conflict

ipmc/mldsnp

Critical

un-conflict

lacp

Low

o disabled

lldp

Low

o disabled

mac learning

Critical

* disabled

* disabled

mstp

Critical

o disabled

mvr

Critical

un-conflict

nas

Critical

* authorized

* authorized

psec

Critical

* disabled

* disabled

qos

Critical

* unlimited

* unlimited

upnp

Low

o disabled

mac-based vlan

Critical

* disabled

protocol-based vlan

Critical

* disabled

vlan_translation

Critical

* disabled

* disabled

voice_vlan

Critical

* disabled

mrp

Low

o disabled

mvrp

Low

o disabled


Note

  • * -- must

  • o -- optional

  • Impact: Critical/High/Low

  • Critical 5 packets -> 0 packet

  • High 5 packets -> 4 packets

  • Low 5 packets -> 6 packets