I personally use the following guide, http://www.juniper.net/techpubs/en_US/junos11.2/topics/reference/general/policer-guidelines-burst-size-calculating.html except with mutiples of 8ms (makes it easier on the maths).
For example, if you've got a 20mbit shaper applied to the interface than the burst rate for all of your policers will be 20kbytes, this will allow for a full shaped rate burst for 8ms. Can tweak to 16ms, 32ms, etc if required. On Thu, Oct 4, 2012 at 12:54 PM, GIULIANO (WZTECH) <giuli...@wztech.com.br>wrote: > People, > > Some topics where questioned today about how to limit traffic for vlan > subscribers using MX5 routers. > > The main question is related to system architecture related to the main > gear (internal machine) to control and limiting packets. > > Using policers (input or output) or shaping-rate we have quite the same > result: miscalculating or error. > > If we create a rule like the following: > > > set class-of-service interfaces ge-0/0/1 unit 530 shaping-rate 20m > > > The output traffic rates 19.2~ Mbps only (using MRTG and SNMP statistics > and graphics). > > We ever needs to allocate more bandwidth for the subscriber like. > > set class-of-service interfaces ge-0/0/1 unit 530 shaping-rate 22m > > To get the correct result ... > > Using policers generate almost the same result for output traffic. > > Is this because of system architecture or this is a graphic's mistake ? > > The burst size limit influence this result ? It must be calculated using > what kind of parameter ? > > For example (same physical interface, same MTU, etc): > > Interface ge-0/0/0 unit 10 - VLAN 10 - 30 Mbps What is the correct burst ? > > Interface ge-0/0/0 unit 20 - VLAN 20 - 50 Mbps What is the correct burst ? > > Interface ge-0/0/0 unit 30 - VLAN 30 - 150 Mbps What is the correct burst ? > > Interface ge-0/0/0 unit 30 - VLAN 30 - 4 Mbps What is the correct burst ? > > Does anyone has solved this problems ? > > Is it possible to get a correct parameter and points to a correct limit > for the contracted bandwidth ? > > Thanks a lot, > > Giuliano > > > ______________________________**_________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/**mailman/listinfo/juniper-nsp<https://puck.nether.net/mailman/listinfo/juniper-nsp> > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp