I have problems in my Cisco network until I connected some Moxa devices.
This Moxa are models EDS-316 and EDS-208
My principal trouble is the traffic UDP. Suddently the network don't permit the traffic UDP in VLAN where are connected Moxa devices.
During an hour the Moxa can send TCP traffic, but can't send UDP. If a Moxa device is unplugged from network, all devices connected to him can work offile from principal network, but if I plugg again the Moxa is like disable.
After one hour (more or less) the system restart all functions and work fine.
I catch the logs from TXerrorsInPorts and all the ports where is connected a Moxa have errors all time.
I don't know which is the problem, but I think that problem is in negotiation from Moxa to Cisco.
This is the configuration from a port where is connected a Moxa:
The EDS-316 and the EDS-208 are both unmanaged switches. As switches only operate in layer 2, switches do not differentiate between UDP or TCP that is found on layer 4 of the OSI model. Other issues that you may be having is the fact that you are using spanning tree and VLANs with an unmanaged switch. Spanning tree BPDU (Bridge Protocol Data Units) will forward just fine with using an unmanaged switch, but the fact that the switch will not actively participate in spanning tree will lead to a whole host of issues, that usually will result in very slow convergence times.
As stated, VLANs is a concerns on unmanaged switches. These two switches support the latest ethernet standard and thus will forward VLAN frames with the added 4 bytes without issue. But as this is an unmanaged switch, it will not tag or untag VLANs, thus it will only work if the edge devices connected to the switch are VLAN aware, or if you have a managed switch on the other end.
My recommendation is to use the Moxa EDS-400 or 500 series switches as both these series are managed switches that support dot1q VLANs as well as RSTP and MSTP. These switches also have the full industrial ratings that the 300 series has and are very easy to program and configure.
[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...