On Mon, Dec 3, 2012 at 11:06 PM, Ryan Goldberg <[email protected]> wrote: > Do you see an issue with blowing up ex4200s with all this ospf and vrrp? I'm > labbing tomorrow and will try to get the boxes to thrash.
I'm interested to know your thoughts on RE performance after you have labbed this scenario. I've read the EX4200 supports 256 VRF-Lite instances, but like you, I imagine the control-plane may become sluggish before it gets to that point. I noticed you include the EX3300 in your design. I also considered this switch and decided against it once I read the feature table. I would like to use them once additional features are working, but right now, it lacks critical items like storm-control. https://www.juniper.net/techpubs/en_US/release-independent/junos/topics/concept/ex-series-software-features-overview.html Also, you mention both EX4200 virtual-chassis, and VRRP. I think it is unusual to choose BOTH V-C and STP+VRRP as redundancy mechanisms, because you get "the worst of both worlds" in terms of potential failure modes. For example, you get the unknown-unicast problems associated with ingress traffic arriving on the VRRP non-master and potentially being flooded out many ports of that switch, because it may never learn MAC addresses of downstream servers while it is the non-master. You also get any problems that you might encounter with virtual-chassis, meaning, bugs. I think you should pick one: V-C or STP+VRRP, depending on which technology you are most comfortable with. Mixing the two is IMO not smart, not because of any unique problems that arise from this combination, but simply because you have decided to expose yourself to two sets of gotchas without necessarily gaining anything. My experience with EX4200 virtual-chassis has been extremely good since Junos 10.4. Before then, we had problems with file system corruption on the EX4200, but this was fixed in 10.4. I have not had any serious stacking-specific bugs since about Junos 9.5. I rely totally on EX4200 virtual-chassis for redundancy in many environments, and am very pleased with the results. Good luck with your project. I hope my comments are constructive and helpful! -- Jeff S Wheeler <[email protected]> Sr Network Operator / Innovative Network Concepts _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
