ERSPAN Configuration on Packet Tracer

Encapsulated Remote SPAN Configuration

Encapsulated Remote Switch Port Analyzer (ERSPAN) is another SPAN type that is used to mirror source ports/vlans traffic to destination ports over GRE Tunnels. Local SPAN is used to monitor the ports in the same switch, Remote SPAN is used to monitor ports in different swithces but use Layer 2 only. ERSPAN is used to monitor remote switch ports over Layer 3. This can be done over GRE Tunnels. Here, we will configure an ERSPAN example and learn ERSPAN Configuration on Cisco switches.

The topology for this Encapsulated Remote SPAN  example will be like below:

Here, we will not configure a GRE Tunnel to focus only ERSPAN Config. We assume that there is a GRE tunnel between these switches. You can also check GRE Tunnel Configuration on Packet Tracer lesson.

ERSPAN Source Side Configuration

For the first switch, Swithc 1, the source one, our ERSPAN Configuration Steps will be like below:

1. ERSPAN Source Interface Config
2. ERSPAN-ID Config
3. ERSPAN Destination IP Config
4. ERSPAN Source IP Config

Now, let’s start our ERSPAN Configuration Example.

ERSPAN Source Interface Config

Fistly, we will configure ERSPAN Source interface. Our source port will be fastethernet 0/6 on switch 1. To do this, we will usethe below config:

Source-Switch-1# configure term

Source-Switch-1 (config)# monitor session 1 type erspan-source   

Source-Switch-1 (config-mon-erspan-src)# source interface fa0/6

Source-Switch-1 (config-mon-erspan-src)# exit

ERSPAN-ID Config

To define the ERSPAN Destination, we will use “destination” keyword. Under it,  we will configure ERSPAN ID. Here, our ERSPAN-ID will be, “123”.

Source-Switch-1 (config-mon-erspan-src)# destination

Source-Switch-1 (config-mon-erspan-src-dst)# erspan-id 123

Destination IP Config

After that, we will configure the IP address of the destination. This ip address is 10.10.10.1. This is the address of the GRE Tunnel destination.

Source-Switch-1 (config-mon-erspan-src-dst)# ip address 10.10.10.1

ERSPAN Source IP Config

Again under the destination, we will configure the ip address of the source device’s port.It will be 192.168.0.1. This is the address of the GRE tunnel source.

Source-Switch-1 (config-mon-erspan-src-dst)# origin ip address 192.168.0.1

ERSPAN Destination Side Configuration

Now, it is time to configure Switch 2, the destination switch. Here, we ill follow the below steps:

1. ERSPAN Destination Interface Config
2. ERSPAN-ID Config
3. ERSPAN Source IP Config

Now, let’s start our ERSPAN Configuration Example.

ERSPAN Destination Interface Config

In the second switch,  we will configure the destination port.Our destination port will be 0/7. To do this, we will create ERSPAN process firstly.

Destination-Switch-2 (config)# monitor session 1 type erspan-destination

Destination-Switch-2 (config-mon-erspan-dst)# destination interface fa0/7

ERSPAN ID Config

To define the ERSPAN Source, we will use “source” keyword. Under it, we will configure ERSPAN ID. Here, our ERSPAN-ID will be, “123”.

Source-Switch-1 (config-mon-erspan-dst)# source

Source-Switch-1 (config-mon-erspan-dst-src)# erspan-id 123

ERSPAN Source IP Config

To define theERSPAN Source IP, we will use the below command. Our source IP will be 10.10.10.1. This is the address of the GRE Tunnel destination.

Source-Switch-1 (config-mon-erspan-dst-src)# ip address 10.10.10.1

This is basically Cisco Encapsulated Remote SPAN Configuration with GRE tunnels.

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