Cisco SG300-10PP - IGMP Snooping konfigurieren

    • Hello community asking for help,

    Initial situation

    My existing home network showed its limits when I upgraded to the new Internetbox Plus and three Swisscom TV2.0 boxes: from a jerky picture, to super slow access to my NAS, to crashing SC TV boxes. A huge broadcast chatter seems to light up all the switch LEDs.

    Thanks to the good information from TuxOne (@Anonymous: Thank you!), I quickly found out that it was a case of network flooding because the existing Netgear switches GS108 v3 do not support IGMP snooping. Since I’ve had problems in my network before, I’ve been considering a managed switch for a long time, which would allow me to better trace issues. I therefore decided on the Cisco SG300 mentioned by TuxOne as the “core switch” and two Netgear GS105Ev2 as access switches.

    Problem

    After setting IP address and PW on the Cisco SG300 and replacing and configuring the cascaded Netgear switches according to TuxOne’s instructions (without VLAN1) I still have “flooding” on all Ethernet ports. Both on the Cisco and on the two Netgears.

    Situation

    Well, to be honest: I always thought I had a rough grasp of the basic principles of Ethernet and TCP/IP. But what this Cisco switch allows is really COMPREHENSIVE:-I. It’s actually a small network.

    Connected to the Cisco SG300:

    Port 1: Swisscom InternetBox

    Port 2: Synology NAS

    Port 3: Swisscom TV 2.0 (bedroom)

    Port 4: Logitech Squeezbox1

    Port 5: HP Color Laser

    Port 6: LoxOne (building automation)

    Port 7: Netgear GS105Ev2 (Office)

    Port 8: Netgear GS105Ev2 (living room)

    Port 9: IP Cam (reserve for later)

    On the Netgear GS105EV2 (office):

    Port 1: Laptop

    Port 2: TV

    Port 3: Swisscom TV 2.0 (Office)

    On the Netgear GS105EV2 (living room):

    Port 1: Logitech Squeezbox2

    Port 2: Denon Receiver

    Port 3: Microsoft xBox

    Port 3: Swisscom TV 2.0 (living room)

    And now the question of questions: How do I configure this set so that the “flooding” no longer “clogs” all the ports?

    - Do I have to configure a VLAN or is it possible without it? Does IGMP snooping only work with VLANs?

    - Do the VLANs (e.g. VLAN10) have to be configured consistently on all three switches?

    - Does IGMP snooping have to be switched on separately on the ports with the attached Swisscom TV 2.0 devices or must IGMP snooping be set somehow “globally”?

    - Does the Cisco SG300 have to be pointed to the IGMP proxy (the SC Internet box)?

    Call

    As you can see, I’m a bit overwhelmed and am grateful for as much help as possible. If I can provide any further input, please let me know. If anyone has a similar setup running, I would be very grateful for screenshots and “simple” instructions and answers to the questions above.

    Thank you very much and greetings

    Gahtscho

    Show original language (German)

    • I recently wrote these instructions to someone via PM: You can largely follow this one with the exception that Mrouter Ports Autolearn is deactivated and Fast Leave is activated. IGMP version is v3. You can also activate MLD snooping if IPV6 is configured for you. It is important that you set the router port for IGMP and MLD to static! I have the IB e.g. on port 1, so this is set to static in the multicast router ports. Unfortunately, the autolearn mode doesn’t work so well, that’s why. In the QOS settings, basic mode and DSCP should already be preselected, otherwise set it like this. I hope you can start something with this. Also download the Manual and the latest Firmware for the switch.

      captainguex

    Currently I don’t have an SG300 nearby for screenshots, but according to [manual](http://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/sf30x_sg30x/administration_guide/ Cisco_300Sx_v1_4_AG.pdf) p.292 two settings must be made:

    • Multicast -> Properties: Enable bridge multicast filtering on VLAN 1
    • Multicast -> IPv4 Multicast Configuration -> IGMP Snooping: enable for VLAN 1

    There shouldn’t be any need for any further settings online; If you bought the 105Ev2 switches from Swisscom, the IGMP snooping is already correctly configured and active there. If you run everything on VLAN 1 and don’t use frame tagging, you don’t need to configure anything specifically. And you don’t need the IGMP proxy either, just IGMP snooping as mentioned above.

    Show original language (German)

    Have you tried turning it off and on again?

    I recently wrote these instructions to someone via PM: You can largely follow this one with the exception that Mrouter Ports Autolearn is deactivated and Fast Leave is activated. IGMP version is v3. You can also activate MLD snooping if IPV6 is configured for you. It is important that you set the router port for IGMP and MLD to static! I have the IB e.g. on port 1, so this is set to static in the multicast router ports. Unfortunately, the autolearn mode doesn’t work so well, that’s why. In the QOS settings, basic mode and DSCP should already be preselected, otherwise set it like this. I hope you can start something with this. Also download the Manual and the latest Firmware for the switch.

    captainguex

    Show original language (German)

    Thank you very much for the quick and good help!

    IPMG Snooping now runs on Cisco and Netgear switches. No more “flooding” - only the LEDs of the ports to which a Swisscom TV Box is connected and active flicker. And of course on the uplink ports to the router, which I connected to port 1 of the respective switch.

    All tips were important. However, this is what made it happen: All ports on VLAN1, router port on static (for me, port 1 on all three switches). Reading the Cisco SG-300 manual also helped, as Cisco also explains how the technology works and thus helps to understand the connections.

    Thank you again and greetings

    Gahtscho

    Show original language (German)