We've got a 2950-24 switch with three LANs connected to it. The switch is then connected to a router for internet access. All of the LANs use DHCP, with a second NIC in a server connecting to the switch. The LANs all work fine, but they can't connect to the internet via the router. Do I have to tell the switch that the port connected to the router is a WAN port?? At the moment when the port is connected to the router, the status LED changes to amber indicating a 'problem'! All of the ports are in VLAN1, and that has been assigned an IP address so I can manage the switch. I can mange it from the internal network, but not from the internet. (It is a public IP). Please point me in the right direction to sort this problem.
Amber light means the port is not forwarding. So, since this connection to your router is amber this is why you most probably cannot get out to the internet. You might have a bridging loop, where STP has put the port into a disabled (blocking state) or the port is not enabled. You should not have to, if all ports are in the same VLAN do anything (configure WAN port). Here is a good think on 2950 troubleshooting that should help you identify your specific issue.
Thanks for the link - unfortuntely I can't access it! If I login and then try to go for the link it says authorisation failed, although I can access other parts of the site that require a login!?!
Th port on the switch is enabled, and there is only one path to the router from any of the LANs (through the switch). There are no duplicate addresses on the LAN's. So what can cause errors with the Spanning Tree Protocol? (If I connect the switch to the router and disconnect all of the other ports, the port still goes amber.)
Thanks - hadn't thought of that! The router is 10Mb half-duplex. I just assumed (possibly dangerously!) that the switch would be auto-configuring on the port. I'll double check the configuration - unfortunately it means a 100mile round trip to the site, as I can't manage it remotely!!
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...