Asked by: Devajuti Jering
 asked in category: General Last Updated: 21st January, 2020

What is a span session?

SPAN Sessions. SPAN sessions (local or remote) allow you to monitor traffic on one or more ports, or one or more VLANs, and send the monitored traffic to one or more destination ports. A local SPAN session is an association of a destination port with source ports or source VLANs, all on a single network device.

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Correspondingly, what is Span and Rspan?

The main difference between SPAN and RSPAN are the relationships between placement of the SPAN Source ports, and the SPAN Destination port to which your network monitoring device (IDS, IPS, Wireshark Laptop, etc) is connected. Whereas RSPAN allows you to decouple the SPAN Destination from the SPAN Source ports

Additionally, why is span necessary on today's switches? SPAN enables port mirroring or copying of traffic from a physical port on a switch to another port on that same switch to non-intrusively feed traffic to out-of-band security tools such as probes, intrusion detection systems, network recorders and network analyzers.

Secondly, what is a SPAN port?

SPAN [Switch Port Analyzer] Port Mirroring also known as SPAN (Switched Port Analyzer), sends a copy of all network packets seen on one port (or an entire VLAN) to another port, where the packets can be analyzed.

What is remote SPAN VLAN?

Remote SPAN RSPAN supports source ports, source VLANs, and destination ports on different switches (or different switch stacks), enabling remote monitoring of multiple switches across your network. Each RSPAN source switch must have either ports or VLANs as RSPAN sources.

35 Related Question Answers Found

Why Port mirroring is used?

Port mirroring is used on a network switch to send a copy of network packets seen on one switch port (or an entire VLAN) to a network monitoring connection on another switch port. Network engineers or administrators use port mirroring to analyze and debug data or diagnose errors on a network.

What is SPAN mode?

The SPAN mode is a unique mode for a TAP that takes the SPAN or mirrored output from a network switch or router into the A port and can replicate all the traffic it receives and send it out ports B, and/or C and/or D of the TAP.

Does Rspan support VTP?

One of the special characteristics is “No MAC address learning occurs on the RSPAN VLAN”. + It does not participate in any of the Layer 2 protocols (STP, VTP, CDP, DTP, PagP). The RSPAN VLAN carries SPAN traffic between RSPAN source and destination sessions.

What is monitor session in Cisco?

monitor session. To create a new Ethernet Switched Port Analyzer (SPAN) or an Encapsulated Remote Switched Port Analyzer (ERSPAN) session configuration for analyzing traffic between ports or add to an existing session configuration, use the monitor session command.

For which reason would you configure Rspan instead of span on your network?

For which reason would you configure RSPAN instead of SPAN on your network? A . RSPAN provides more complete monitoring of the traffic on a single switch.

Is span Cisco proprietary?

SPAN (Switched Port Analyzer) is a Cisco Proprietary feature which allows to send a copy of traffic passing through ports to another port on the switch.As demand on deep packet inspection and analysis grew , so did the development on SPAN and Cisco cam up with RSPAN and ERSPAN.

What is reflector port in Rspan?

The reflector port is the mechanism that copies packets onto an RSPAN VLAN. The reflector port forwards only the traffic from the RSPAN source session with which it is affiliated. Any device connected to a port set as a reflector port loses connectivity until the RSPAN source session is disabled.

What is Erspan Cisco?

The Cisco ERSPAN feature allows you to monitor traffic on one or more ports or more VLANs, and send the monitored traffic to one or more destination ports. ERSPAN sends traffic to a network analyzer such as a Switch Probe device or other Remote Monitoring (RMON) probe.

What is RSTP port?

Rapid Spanning Tree Protocol (RSTP) is a network protocol that ensures a loop-free topology for Ethernet networks. RSTP defines three port states: discarding, learning, and forwarding and five port roles: root, designated, alternate, backup, and disabled.

What is trunk port?

A trunk port is a port that is assigned to carry traffic for all the VLANs that are accessible by a specific switch, a process known as trunking. Trunk ports mark frames with unique identifying tags – either 802.1Q tags or Inter-Switch Link (ISL) tags – as they move between switches.

What is a monitoring port?

A monitor port is a port used to establish the connection between the monitor and computer in order to display the computer's output. The connection can be either analog or digital. Most computers, laptops and other portable devices have built-in hardware, modules and monitor sockets to support monitor ports.

How do I configure a port on a switch?

Switch ports can be manually configured with specific duplex and speed settings. Use the duplex interface configuration mode command to manually specify the duplex mode for a switch port. Use the speed interface configuration mode command to manually specify the speed for a switch port.

How does a switch prevent loops?

How does STP prevent loops? Because the “best ports” are put into forwarding state and the other ports are put into blocking state, there are no loops in the network. When a new switch is introduced to the network, the algorithm and port states are recalculated to prevent a new loop.
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