Invalid CRC means you are losing packets due to an invalid checksum (CRC)
This is normally caused by a defective LAN-adapter, a cabling problem or other problems with your physical layer. If you know when these errors have started to appear, think wheter the last modification to your network coincides with this. Then you have a starting point, otherwise you will have to follow the rigourous method:
When the count continues to rise steadyly, try to locate the interface thats causing the errors as follows. Try disconnecting them one by one until the errors stop to increment and check the cabling from there on.
No need to tell you that your users will be disconnected also, but this type of error is often only reproduceable during office hours when all network nodes are active.
[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...