Forum Discussion

Aspirant

May 22, 2017

Solved

Re-creating an RSPAN VLAN on an M4100-50G switch

Hello everyone, I would like assitance in re-creating an RSPAN VLAN on an M4100-50G switch. Background information: We have a firewall that we are monitoring network traffic on. On a previo...

Troubleshooting

Retired_Member
Jun 07, 2017
Hi jg75996,

Could you disable STP mode for port 0/45~0/48 on M4100 and try again?

Web GUI go to 'Switching'-->'Ports'-->'Configuration', then select port 0/45~0/48, set STP Mode to 'Disable'.

jg75996

Aspirant

May 23, 2017

Hello EricZ,

Thank you for the information on how RSPAN is utilized in a three switch role.

The switch models that I have mentioned have the following roles:

For the M4300-52G-PoE+, there are 7 switches configured in a stack and they are housed in a standalone rack. They act as our core switch, with connections going to workstations, VoIP phones, NAS boxes, routers and other network appliances.

The M4100-50G is our "server" switch and is located in a server rack that is on the other side of the network room. This switch is uplinked to the M4300 switchstack via a trunk line.

Retired_Member

May 24, 2017

Hi jg75996,

Thanks for your immediately response. Now we clear your two switch working role.

Could you kindly answer more questions as below:

1. In your network topology, which switch is working as source switch for RSPAN? Which port traffic you want to mirror?

2. In your network topology, which switch is working as destination switch for RSPAN? Which port you want to receive the mirror traffic?

And if these two problem is clear, we can check the configuration further more.

Thanks.

Regards,

EricZ

NETGEAR employee

jg75996
Aspirant
May 24, 2017
Hello EricZ,

I don't plan on having one switch as source and one as destination. Just trying to replicate what I had on the M4300 originally on to the M4100.

Here is the current layout of the devices involved:
What seems to be happening is that port 0/45 on the M4100 switch is discarding the packets coming from the network tap mirror port.

I think it may be that Spanning Tree is blocking the port. Most likely it is because the link coming from the tap is being detected as a loop in the network.
- jg75996
  Aspirant
  May 24, 2017
  ... and here is the old layout that was working before...
  - Retired_Member
    May 25, 2017
    Hi jg75996,
    
    Ok, according to these two network topology, could you paste the configuration for M4300 port 2/0/45~2/0/48 and for M4100 port 0/45~0/48, we need more detailed information for further analysis.