Re: What packet will switch send when config with keepalive ?
You created a physical loop by cabling two ports of the switch to one hub.
The hub receives the frames on port-A and forwards it to all other ports (including port-B) the switch receives the frame from port-B and inspects the source and destination address. Since it is a loopback frame which originated locally the switchs displays an error.
A hub is considered an OSI layer-1 device. It copies and amplifies the recieved signal to all connected ports on the hub.
Whereas the switch (aka. multiport bridge) is an OSI layer-2 device and forwards frames based on the destination address to the recepient or the nearest path to the recipient.
[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...