[alcatel-nsp] 回复： 回复： what's the difference between policer and queue,IN QOS for al 7750-SR

[Jonathon Exley]

A policer does not buffer frames. The MBS is the max burst size and CBS is the committed burst size.
For a queue, the MBS and CBS are buffer sizes ¨C the queue depth.

Jonathon Exley | Network Specialist Layer 2

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From: alcatel-nsp [mailto:alcatel-nsp-bounces at puck.nether.net] On Behalf Of ??
Sent: Thursday, 6 August 2015 1:05 p.m.
To: Mark Ivens <mark at clara.net>; alcatel-nsp <alcatel-nsp at puck.nether.net>
Subject: [alcatel-nsp] »Ø¸´£º »Ø¸´£º what's the difference between policer and queue,IN QOS for al 7750-SR

Is that meaning policer will drop packages that out of the CIR?
In other words, policers can uses the Mbs buffer,but cann't use the CBS buffer.
and that's the different that quenue can use the cbs buffer and mbs buffer.

some configure looks like that:
 qos
        sap-ingress 2 create
            description "Qos-in-from-user-2M"
            queue 1 create
            exit
            queue 11 multipoint create
            exit
            policer 1 create
                rate 2048 cir 2048
                mbs 10 kilobytes
            exit
            policer 2 create
                rate 128 cir 128
                mbs 128 kilobytes
                cbs 64 kilobytes
            exit
            fc "af" create
                policer 1
            exit
            fc "be" create
                policer 1
            exit
            fc "ef" create
                policer 2
            exit
            fc "h1" create
                policer 1
            exit
            fc "h2" create
                policer 1
            exit
            fc "l1" create
                policer 1
            exit
            fc "l2" create
                policer 1
            exit
            fc "nc" create
                policer 1
            exit
            ip-criteria
                entry 10 create
                    match protocol icmp
                    exit
                    action fc "ef"
                exit
            exit
        exit
------------------ ԭʼÓʼþ ------------------
·¢¼þÈË: "Mark Ivens";<mark at clara.net<mailto:mark at clara.net>>;
·¢ËÍʱ¼ä: 2015Äê8ÔÂ5ÈÕ(ÐÇÆÚÈý) ÍíÉÏ10:47
ÊÕ¼þÈË: "alcatel-nsp"<alcatel-nsp at puck.nether.net<mailto:alcatel-nsp at puck.nether.net>>;
Ö÷Ìâ: Re: [alcatel-nsp]»Ø¸´£º what's the difference between policer and queue,IN QOS for al 7750-SR




On 05/08/2015 15:07,  wrote:
> sorry,subject is wrong,my question is
>  what's the difference between policer and queue,IN QOS for al 7750-SR
A policer is used to drop traffic exceeding a certain rate.

A queue is memory used to absorb bursts of packets.

A shaper (rather than a policer) uses a queue to store non-conforming
packets and attempts to de-queue them at a conforming rate.
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