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CLI-based Configuration Guide - Network Management and Monitoring

AR100, AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R009

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Licensing Requirements and Limitations for Mirroring

Licensing Requirements and Limitations for Mirroring

This section provides the points of attention when configuring mirroring.

Involved Network Elements


Licensing Requirements

mirroring is a basic feature of a router and is not under license control.

Feature Limitations

  • Support for the mirroring function:
    • In local port mirroring, the device supports inter-card mirroring. That is, the observing port and mirrored port can be located on different cards of the device.

    • In local flow mirroring, when a WAN interface is used as a mirrored port, the device supports inter-card mirroring.

    • When a LAN interface is used as a mirrored port, the device does not support local flow mirroring.

    • The device can copy packets on one or more mirrored ports to one local observing port.

    • Only one local observing port can be configured on the device, and the observing port must be a LAN or WAN Ethernet port.

    • When a LAN Ethernet port is used as a mirrored port, a WAN Ethernet port cannot be used as an observing port.

  • Pay attention to other points:
    • Generally, an observing port is only used to forward mirrored traffic, so it is recommended that other services be not configured on the observing port. If other services are configured on the observing port, mirrored traffic and traffic of other service may affect each other.

    • When mirroring is configured on the device, too many mirrored packets occupy much internal forwarding bandwidth and affect other services. Additionally, if the mirrored port and observing port provide different bandwidth, for example, 1000 Mbit/s on the mirrored port and 100 Mbit/s on the observing port, the observing port may fail to forward all mirrored packets in a timely manner because of insufficient bandwidth, leading to packet loss.

    • When both port mirroring and flow mirroring are configured for packets, port mirroring takes effect in the inbound direction and flow mirroring takes effect in the outbound direction.

    • In port mirroring, the outbound packets sent by observing ports may carry different VLAN tags than the packets sent by mirrored ports. This will not affect existing services.

    • For the AR121, AR129, AR129GW-L, AR129CGVW-L, AR109, AR109W, AR109GW-L, AR161, AR161G-L,AR161G-Lc, AR161G-U, AR169, AR169G-L, AR169EW, AR169CVW, AR169CVW-4B4S, AR169EGW-L, AR169-P-M9 to monitor packets on a sub-interface, ensure that the sub-interface and observing port are in the same VLAN.

    • For the AR2204-51GE-R, AR2204-51GE-P and AR2204-51GE, when GE0/0/3 to GE0/0/50 work as Layer 2 Ethernet interfaces, GE0/0/3 to GE0/0/26 and GE0/0/27 to GE0/0/50 cannot be bound to the service.

    • If an Eth-Trunk is configured as a mirrored port, its member ports cannot be configured as mirrored ports. To configure a member port as a mirrored port, delete it from the Eth-Trunk first.
    • If an Eth-Trunk member port is configured as a mirrored port, the Eth-Trunk cannot be configured as a mirrored port. To configure the Eth-Trunk as a mirrored port, delete the member port from the Eth-Trunk first.
    • When port mirroring and traffic shaping (GTS) are configured on the interface, if there is a message on the interface that is discarded by GTS, the message mirrored by the port still contains those messages that were discarded by GTS.
Updated: 2019-05-17

Document ID: EDOC1000174072

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