I am currently looking for a way to design a solution which incorporates a primary xDSL WAN connection with a cellular interface (UMTS) as backup, over two separate C1841 routers. So one router with xDSL WAN, the other router on cellular WAN.
The solution works fine if implemented on a single C1841 router with a "backup interface cellular 0/1/0" configured on the ATM0 interface.
However, this solution will not work in a situation with two routers.
According to cisco documentation found on this site, there is an option to use a floating static, and/or configuring IP SLA.
However, I would like to keep the cellular interface in a "standby mode" or "shutdown" until I actually need to start using it (when xDSL fails).
The cost for data sent over cellular is quite high, so I want to avoid sending any data over cellular if there is no need to.
[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...