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Function of the Reflector Port of the Core Switch

A reflector port on a core switch is used to loop back traffic from a source port onto an RSPAN VLAN for remote monitoring, effectively enabling traffic analysis without affecting normal network operations.

Overview

A reflector port is a specialized port on a switch configured to copy packets from a source port or VLAN and place them onto an RSPAN (Remote Switched Port Analyzer) VLAN for monitoring purposes. It is primarily used in network traffic analysis, allowing administrators to capture and inspect traffic from multiple switches or VLANs without physically connecting monitoring devices to each source port.

Key Functions

Traffic Loopback: The reflector port loops back untagged traffic from the source session and forwards it to the RSPAN VLAN, which is then flooded to trunk ports carrying that VLAN. Remote Mirroring: It enables remote mirroring, allowing traffic from one switch to be analyzed on another switch or monitoring device located elsewhere in the network. Isolation: The port is invisible to all other VLANs and cannot participate in normal network communication while configured as a reflector port.

Spanning Tree Disabled: Spanning Tree Protocol is automatically disabled on the reflector port to prevent loops and ensure uninterrupted mirroring. Port Restrictions: A reflector port cannot be a SPAN source or destination, cannot be part of an EtherChannel while active, and can only serve one RSPAN session at a time.

Operational Considerations

Device Connectivity: Any device connected to a reflector port loses connectivity until the RSPAN session is disabled.

VLA

N Tagging: Administrators can configure the reflector port to send mirrored traffic as tagged or untagged depending on monitoring requirements. Temporary Use: The port is dedicated to mirroring while the session is active and cannot perform other switching functions.

Importance in Core Switches

In a core switch, which aggregates traffic from distribution and access layers and handles high-volume routing and switching, reflector ports are critical for: Network Diagnostics: Capturing traffic from multiple layers for troubleshooting or performance analysis. Security Monitoring: Observing suspicious traffic patterns without disrupting normal operations. Performance Testing: Evaluating network load and latency by analyzing mirrored traffic.

By using a reflector port, network administrators can monitor and analyze traffic efficiently across the network backbone while maintaining the high performance and reliability expected from core switches.

Function of the Reflector Port of the Core Switch

Configure Catalyst Switched Port Analyzer (SPAN): Example

IntroductionPrerequisitesBackground InformationSpan on Catalyst Express 500/520Span on The Catalyst 2900XL/3500XL SwitchesSpan on The Catalyst 2948G-L3 and 4908G-L3Span on The Catalyst 8500Frequently Asked Questions and Common ProblemsRelated InformationThe SPAN feature, which is sometimes called port mirroring or port monitoring, selects network traffic for analysis by a network analyzer. The network analyzer can be a Cisco Switch Probe device or other Remote Monitoring (RMON) probe. Previously, SPAN was a relatively basic feature on the Cisco Catalyst Series switches. However, the latest release...See more on cisco Published: Aug 30, 2024ManualsDump

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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