As cmcclinton has already noted, FastEthernet 0/0 appears to be configured to work with .1Q VLAN tagged frames. On a Cisco switch, such a port would be usually configured with access-mode trunk. On a Cisco router, such a port is configured using subinterfaces, with the interface name's .# suffix indicating the subinterface identification. BTW, the subinterface identification number doesn't need to match the VLAN tag, but it's good practice to do so.
Also BTW, the main interface could also have an IP address. If it did, it would deal with untagged frames, the "native" VLAN, for a Cisco switch port.
[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...