Currently one of my client is using single ASR 1000 as its WAN core. Branhces have 2 ISPs, and both these ISPs are connected to this ASR. Now since its a single point of failure, we need to introduce another ASR 1000. But i am getting confused as how to design it. Shall i
Bring one ISP on first ASR and second on the other ? will that be a good design
Introduce a switch, terminate all ISP links on this switch and connect both ASRs to this switch, but then how to manage the ISP links (all links have /30 IP subnets). I thought of connecting both ASRs directly and via EEM, i thought of configuring a keepalive mechanism on new ASR. If the first ASR goes down, it will automatically turn on the links but than branches will face disruption.
What is the better design ? i tried looking at cisco validated designs but dont knw which document to look for
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If the device doesn't support hardware redundancy, then common solution is to use a second device. So, using a second router, for the 2nd ISP, would be a common approach. BTW, although you're using an ASR 1k now, the second device could be some other kind of device.
If you install a second HQ device, don't forget you want, if possible, not have other single points of failure. For example, if both devices only connect to the same switch, and it doesn't support hardware redundancy, failure of that switch would drop you WAN.
[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...