[j-nsp] How to calculate "burst-size-limit" in JUNOS Firewall Policer

[Ogiboski, Robson (NSN - BR/Curitiba)]

See JNCIA guide pag 456.

Setting the burst-size-limit
The Juniper Networks Technical Assistance Center (JTAC) suggests setting
the burst-sizelimit
equal to the amount of traffic forwarded by the interface in 5
milliseconds. Let's look at
an example.
Suppose you have a Gigabit Ethernet interface in your router. The
interface can receive 1000
megabits per second. The burst-size-limit is entered in bytes per
second, so we translate
1000Mbps into 125MBps. That further translates into 125,000KBps and
finally 125,000,000Bps.
In a single millisecond, the interface receives 125,000 bytes, so a
total of 625,000 bytes are
received in 5 milliseconds. The policer statement becomes
burst-size-limit 625000.

Robson