Solved

Routing problem on FSM7328S

Posted on 2007-03-23
2
2,764 Views
Last Modified: 2008-01-09
This is the first time I'm configuring a L3 switch, so please excuse if this might be a stupid question for you:

I'm using 2 stacked Netgear FSM7328S switches. I've configured 3 different VLANs:
VLAN ID 10   192.168.1.0 / 24
VLAN ID 20   192.168.2.0 / 24
VLAN ID 30   192.168.3.0 / 24
Routing between these VLANs works fine.

To enable routing to an external network 10.1.2.0 / 24 and to the Internet I did configure port 1 as interface 192.168.5.254 / 24 on the switch. In addition I did configure a Netgear VPN router (FVX538) with LAN IPs 192.168.5.253 /24 and 10.1.2.254 / 24 and I did use a patch cable for connection between the VPN router and port 1 on the switch.

I've added the following default route on the FSM7328S stack:
Network address 0.0.0.0, SM 0.0.0.0, Interface: Port 1, Next Hop IP 192.168.5.253
I've added the following route on the VPN router FVX538:
Network address 192.168.0.0, SM 255.255.0.0, Interface: LAN, Gateway IP 192.168.5.254

When I connect a computer to VLAN 20 (IP: 192.168.2.50) it will be able to ping successfully addresses in the Internet as well in the 10.2.2.0 / 24 subnet. In this direction all seems to work fine. But I'm neither able to ping IP addresses in the VLANs nor the gateway IP 192.168.5.254 on the FSM7328S stack from computers in the 10.2.2.0 / 24 subnet.

If I ping to 192.168.2.254 for example (this is the routing interface in VLAN 20) from IP 10.1.2.51, then my computer in the VLAN will lose connection to the switch. After some minutes connection will be restored. I can restore connection manually if I unplug the cable of this computer on the FSM7328S and re-connect it into another switch port.

Does anybody know what might be the reason for this behaviour?

Thanks in advance!
ghana
0
Comment
Question by:ghana
2 Comments
 
LVL 11

Accepted Solution

by:
ghana earned 0 total points
ID: 18785647
OK, I found the reason myself:It was caused by Spanning Tree Protocol and another switch.

In the log of the switch stack I found the following entries, that appeared every 2 seconds:
0.0.0.0-1 UNKN[280142736]: dot1s_sm.c(1351) 43042 %% dot1sPrxMachine(): Rcvd BPDU in Discard State on port 1

The subnet 10.1.2.0 / 24 does contain another single FSM7328s switch. This switch tried to communicate with the switch stack via spanning tree protocol. When I disabled the spanning tree on the single switch in subnet 10.1.2.0. / 24 the problem was solved. Now communication in both directions does work as expected.
0

Featured Post

Highfive Gives IT Their Time Back

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

The worst thing when starting a new job is when the previous Network Administrator left behind no documentation. How do you get into the devices? If you've been in this situation or just accidently mistyped your password, this article will hopefully…
I eventually solved a perplexing problem setting up telnet for a new switch.  I installed a new Cisco WS-03560X-24P switch connected to an existing Cisco 4506 running a WS-X4013-10GE Sup II-Plus. After configuring vlans and trunking,  I could no…
Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

747 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now