Hi,
I just installed some CCR1016 in parallel to our existing core routers (different VLANs) so I can test them on real WAN links.
The Network is built like a ring and consists of 5 routers. There are about 50 routes in the table.
After setting everthing up, I was very happy that everything worked like a charm (I thought). But the happyness didn’t last for long…
I tested what happens if one link goes down. After the dead-timer runs out, it takes quite long (20 sec.) until the routing table is restored and the routers can be reached again. And even worse: if I use dead-timers below 10 sec., the remaining sessions on the router go down too because the CCR is to slow to keep up with the timers, which generates some Kind of “domino-effect” on all routers in the Network.
More bad news: If the link comes up again, the routers behind the link can’t be reached for about 20 sec. while the CCR works on its routing table. Shoudn’t it do this work in the Background without causing packet loss?
It was quite disappointing to see that even the low powered Ciscos can do this kind of work way better. The only thing I see when I use them in similar situations, is some packet loss until the dead-timer runs out and a bit higher RTTs for some seconds until the routing table is consistent. If the link comes up again, I can see nothing. It just works.
What is your experience with the CCRs in such scenarios?
- Mat