Lets say that client uses serial line connection to the central office and ISDN backup call in case of serial failiure. What very often happens is that the ISDN is not functioning or has stoped functionig on the telco side but since the serial line is up the client is not aware of ISDN line failiure and therefore it has not been reported to the telco. Once the serial line fails only then the client is aware of ISDN failiure as well.
Does anyone have this problem and what is the best way of testing the backup line, in this case ISDN?
[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...