I have an ethernet circuit that we brought up this morning to test. We did a failover test with me shutting the interface down, and while this work it's not a real world test. BGP took a while to converge. (Timers are set to 7 and 21.) Basically, we have the following:
If the circuit goes down, I can't track it by line-protocol because the router will think it's up if the switch is fine. I created an SLA that pings the provider, but I found that this is extremely difficult to simulate a failure with. Is it even possible? I tried to create a loopback and create an sla to ping that. I shut the loopback down, and using tracking failed over to the other router. That part worked, but because the provider was still up, my bgp peering obviously never went away. My traffic was going into the primary site even though the primary site was now the standby for hsrp. I tried conditional advertisement based on the loopback interface (lo15) being in the routing table, and then if it wasn't, I wanted to stop advertising the subnet that I was trying to get to. Well, this didn't work at all. The subnet from lo15 wasn't in the table, but I was still advertising it. That's going to be something I'll need to look at later. Anyway, is there a way to simulate an sla failure and have the 2 routers fail over without getting the provider involved? My next step is to get in touch with the provider and just have them shut their interface to me to see if failover happens fairly quickly.
Thanks for the response. I labbed this up, but I don't see a difference with it vs. leaving the standard fast-external-fallover feature enabled unfortunately. From what I see it doesn't do anything different from tracking an sla using hsrp and then moving from active to standby when that sla is triggered.
I had the provider shut their port down towards me and failover happened within about 5 packets. Traffic kept flowing seamlessly to the user, so I don't think anything else on this side needs to be done
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.