On Sat, Jan 16, 2016 at 03:54:01PM +0200, Mark Tinka wrote: > > On 16/Jan/16 13:57, Eric Van Tol wrote: > > > > > We've been pretty happy with the ASR, especially the models with 4x10G > > on-board. The cost is significantly less than an ME3600, even with a full > > suite of licenses (Advanced IP Metro, all 10G ports, all GE ports), and the > > footprint is much smaller (well, more shallow). > > +1. > > We've started rolling them out since last December, and so far so good. >
+1 also, we have several ASR920-24SZ-IM's and 24SZ-M's out in the field and we're very happy with them. Aside from LAG limitations (workaround solution was to not use them :-S), the only other issue I've run into is that default port buffer/queue sizes (48KB?) are rather small. This is a slight annoyance since typical deployment of 920 has at least 2x 10GE feeding the 1GE revenue ports on the box. As I understand, 920 only has 12MB shared buffer space so that probably explains it, but on default queue sizes, almost every 1GE end-user port (no traffic-shaping on user ports, just full-rate 1G port with 10G uplink) excessively collects output drops on practically most trivial IMIX usage. For example, a FreeBSD box sitting with 1GE behind ASR920 just doing wget from a download mirror 50ms away records output drops on 920; whereas a 1GE port off of ASR9K or MX80 would not collect output drops for this type of usage. Sure, it is reasonable to expect an end-user running Speedtest.net or watching Netflix spamming multiple flows to cause output drops, but not on single flow of download. As a workaround, raising the queue-limit to 512 KB per 1G port dramatically gets rid of output drops for trivial traffic. You should still see drops for longhaul bursty traffic overwhelming a 1GE interface when stepping down from 10G uplink, but that's pretty much a reasonable congestion at that point, so dropping packet is better. 512KB seems to be reasonable; 24x1GE * 512KB = 12.2MB, so we don't oversubscribe the global buffer space, and it's roughly ~4ms of output buffer per port. ! class-map match-any cos_all match cos 0 1 2 3 4 5 6 7 policy-map MC_1G_512kb class cos_all bandwidth percent 100 queue-limit 512000 bytes ! James _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
