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CCNP ENCOR lab 26 of 36

SPAN and RSPAN: mirror traffic to an analyser

Mirror a warehouse PC's traffic to a Linux analyser, first with local SPAN on the same switch and then with RSPAN across a trunk to a second switch, and capture it with tcpdump.

Run this lab

It needs Lite: its 5 nodes are set to 5 vCPU and 4,096 MB in total. That fits the free demo too.

In your workspace: Shared, then CCNP ENCOR 350-401 guided labs, then 26 - SPAN and RSPAN - mirror traffic to an analyser

Try it free for 30 minutesRun it on Lite from £3 a day

The free demo needs no card and no email. Every lab plan includes every guided lab.

Level
Intermediate
Time
About 50 minutes
Nodes need
5 vCPU, 4,096 MB
Smallest plan
Lite

The scenario

Fernhill Freight's payroll clerk (PC1) reports that a payroll application keeps timing out. The application team wants a packet capture of PC1's traffic, and they'd also like to see everything in the staff VLAN from the network operations desk, which is connected to a different switch.

You'll mirror traffic to ANALYSER, a small Linux box with two network cards: eth0 is plugged into SW1 (for local SPAN), eth1 into SW2 (for RSPAN). SW1 already pings PC1 every two seconds from its VLAN 10 address (IP SLA 1), so there's always something to capture.

DevicePortRole
SW1Gi1/0PC1 (VLAN 10, 10.10.10.10): the port to mirror
SW1Gi1/1PC2 (VLAN 10, 10.10.10.11)
SW1Gi1/2ANALYSER eth0 (local SPAN destination)
SW1Gi0/1trunk to SW2
SW1Vlan1010.10.10.2/24
SW2Gi0/1trunk to SW1
SW2Gi1/0ANALYSER eth1 (RSPAN destination)

Topology: SW1 — SW2 over a trunk; PC1, PC2 and ANALYSER eth0 on SW1; ANALYSER eth1 on SW2.

What you’ll practise

  • Explain SPAN, RSPAN and ERSPAN and when each one is used
  • Configure a local SPAN session with source ports, direction and destination port
  • Create an RSPAN VLAN and build source and destination sessions on two switches
  • Capture mirrored traffic with tcpdump and verify sessions with show monitor

The tasks

  1. Prepare the analyser
  2. Know your mirroring options
  3. Local SPAN of PC1's port
  4. Prepare the RSPAN VLAN
  5. Build the RSPAN sessions
  6. Capture like an engineer

The Lab Tasks pane has the scenario, these tasks, the checks to run, hints and the full solution.

Topology and devices

The network as it opens in EVE-NG, drawn from the lab’s own canvas, and the image each node runs.

Topology of SPAN and RSPAN - mirror traffic to an analyser5 nodes, 5 links. Every link is listed as text below the diagram.SW1SW2PC1PC2ANALYSERGi1/1eth0Gi1/0eth1Gi1/0eth0Gi1/2eth0Gi0/1Gi0/1
5 nodes, with the interface names each link uses. On a narrow screen, scroll the diagram sideways.
Every link, as text
  • SW1 Gi0/1 to SW2 Gi0/1
  • SW1 Gi1/0 to PC1 eth0
  • SW1 Gi1/1 to PC2 eth0
  • SW1 Gi1/2 to ANALYSER eth0
  • SW2 Gi1/0 to ANALYSER eth1
Nodes in SPAN and RSPAN: mirror traffic to an analyser, with the image each runs and the vCPU and RAM it’s set to
NodeDeviceImage in Add NodeSet to
SW1Cisco IOSvL2viosl2-adventerprisek9-m.ssa.high_iron_202009291 vCPU, 768 MB
SW2Cisco IOSvL2viosl2-adventerprisek9-m.ssa.high_iron_202009291 vCPU, 768 MB
PC1VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
PC2VPCS hostBuilt in to EVE-NGCounted as 1 vCPU, 1,024 MB
ANALYSERAlpine Linuxclbalpinebase-alpine-base-3-20-31 vCPU, 512 MB

How to open this lab

  1. Sign in to your workspace at lab.cloudlabbox.com.

  2. In File Manager, open Shared, then the folder CCNP ENCOR 350-401 guided labs.

  3. Open 26 - SPAN and RSPAN - mirror traffic to an analyser and start its nodes, then open Lab Tasks for the scenario and the steps.

The lab is read-only. You can start the nodes and configure the devices, but changes to the topology can’t be saved. To change it, rebuild it in your own folder.

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CloudLabBox is independent of Cisco. The lab follows exam topics and isn’t vendor training material; vendor names identify the exams and the images in the workspace.