From: Bob Sinclair (bsin@cox.net)
Date: Mon Nov 22 2004 - 13:16:07 GMT-3
Tim,
Absolutely. The policy will set precedence to X for all traffic outbound
DLCI 102 on the hub, regardless of its source.
Bob Sinclair
CCIE #10427, CCSI 30427, CISSP
www.netmasterclass.net
----- Original Message -----
From: "ccie2be" <ccie2be@nyc.rr.com>
To: "Bob Sinclair" <bsin@cox.net>; "Group Study" <ccielab@groupstudy.com>
Sent: Monday, November 22, 2004 10:37 AM
Subject: Re: MQC Matching on DLCI
> Bob,
>
> Let's say R1 has 1 dlci, 102 , to R2 adn another one to R3, 103.
>
> Couldn't this be done?
>
> class-map DLCI-102
> match fr-dlci 102
>
> policy-map IP-PREC
> class DLCI-102
> set ip-prec X
>
> int s0
> encap fram
> fram map ip x.x.x.2 102 broadcast
> fram map ip x.x.x.3 103 broadcast
> service-policy output IP-PREC
>
> Now, traffic to R2 will have the ip prec set to X while the dlci to R3
> will
> just have the default precedence, don't ya think?
>
> Tim
> ----- Original Message -----
> From: "Bob Sinclair" <bsin@cox.net>
> To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
> Sent: Monday, November 22, 2004 10:18 AM
> Subject: Re: CAR vs Police
>
>
>> Tim,
>>
>> I too have trouble visualizing it! I went back and checked my lab notes,
>> and what I actually did was to set precedence on the hub for traffic
>> transiting between spokes. The policy was applied on input matching on a
>> DLCI. I also set precedence using an input policy and matched that
>> precedence in an output policy on the same multipoint. I cannot think of
> a
>> way to match input DLCI in an outbound policy, as you can with an input
>> interface match.
>>
>> Good catch!
>>
>> Bob Sinclair
>> CCIE #10427, CCSI 30427, CISSP
>> www.netmasterclass.net
>>
>>
>> ----- Original Message -----
>> From: "ccie2be" <ccie2be@nyc.rr.com>
>> To: "Bob Sinclair" <bsin@cox.net>; "Group Study" <ccielab@groupstudy.com>
>> Sent: Monday, November 22, 2004 10:04 AM
>> Subject: Re: CAR vs Police
>>
>>
>> > Hey Bob,
>> >
>> > All in all, this MQC stuff is turning to be very flexible and powerful.
>> >
>> > But, I can't visualize how to configure that matching inbound and
> setting
>> > outbound thing you mentioned. A service policy is one way either
> inbound
>> > or
>> > outbound. Any chance you can show me an example of what you're saying?
>> >
>> > Thanks, Tim
>> >
>> > ----- Original Message -----
>> > From: "Bob Sinclair" <bsin@cox.net>
>> > To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study"
> <ccielab@groupstudy.com>
>> > Sent: Monday, November 22, 2004 9:37 AM
>> > Subject: Re: CAR vs Police
>> >
>> >
>> >> Tim,
>> >>
>> >> I have had a chance to lab up matching on DLCIs, and it does behave as
>> >> you
>> >> indicate: applies to outbound traffic if the policy is applied
> outbound,
>> >> and vice versa. What caught my eye: you can match inbound DLCI and
> set
>> >> outbound, even when both DLCIs are on a single multipoint. Another
>> >> illustration that the multipoint hub does a complete decapsulation -
>> > routing
>> >> process - encapsulation.
>> >>
>> >> Bob Sinclair
>> >> CCIE #10427, CCSI 30427, CISSP
>> >> www.netmasterclass.net
>> >>
>> >>
>> >> ----- Original Message -----
>> >> From: "ccie2be" <ccie2be@nyc.rr.com>
>> >> To: "ccie2be" <ccie2be@nyc.rr.com>; "Bob Sinclair" <bsin@cox.net>;
> "Anas
>> >> Tarsha" <ra3i@yahoo.com>; "Group Study" <ccielab@groupstudy.com>
>> >> Sent: Monday, November 22, 2004 8:58 AM
>> >> Subject: Re: CAR vs Police
>> >>
>> >>
>> >> > Well, I think I found the answer to my questions regarding CAR vs
>> >> > Police
>> >> > using MQC.
>> >> >
>> >> > With the new features now available, there is NO functionality in
>> >> > CAR
>> > that
>> >> > isn't available with MQC.
>> >> >
>> >> > See this link:
>> >> >
>> >> >
>> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ft3level.htm
>> >> >
>> >> > As this link shows, it's now possible to nest police commands with
> MQC.
>> >> >
>> >> > And, it's also possible to match traffic based on dlci, so therefore
> a
>> >> > policy can be applied to the traffic of one particular dlci.
>> >> >
>> >> >
>> >
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t13/ftpcdlci.htm
>> >> >
>> >> > I assume that when matching traffic based on dlci, whether the dlci
>> >> > matched
>> >> > is the incoming or outgoing depends on whether the service-policy is
>> >> > applied
>> >> > to outgoing or incoming traffic, but I can't confirm that until I
>> >> > get
>> > some
>> >> > rack time.
>> >> >
>> >> > Any thought?
>> >> >
>> >> > Tim
>> >> > ----- Original Message -----
>> >> > From: "ccie2be" <ccie2be@nyc.rr.com>
>> >> > To: "Bob Sinclair" <bsin@cox.net>; "Anas Tarsha" <ra3i@yahoo.com>;
>> > "Group
>> >> > Study" <ccielab@groupstudy.com>
>> >> > Sent: Sunday, November 21, 2004 5:35 PM
>> >> > Subject: Re: CAR vs Police
>> >> >
>> >> >
>> >> >> Hi Bob,
>> >> >>
>> >> >> As I going over all the old GS posts on policing, I came this one
>> >> > comparing
>> >> >> CAR and Police.
>> >> >>
>> >> >> According to the DQoS by Odem, one of the differences is that with
> CAR
>> >> >> you
>> >> >> can configure nested rate-limit commands but not with MQC. Since
>> > there's
>> >> >> been alot of new features added to MQC, I wonder if that still
>> >> >> holds
>> >> >> true.
>> >> >>
>> >> >> For example, according to Odem, you couldn't enable MQC on a per
> dlci
>> >> > basis,
>> >> >> but since now you can match on dlci, you can.
>> >> >>
>> >> >> So, I wonder if a config like this would fly
>> >> >>
>> >> >> policy-map VOICE
>> >> >> class VOICE
>> >> >> police 128000
>> >> >>
>> >> >> policy-map ALL-TRAFFIC
>> >> >> class class-default
>> >> >> police 256000
>> >> >> service-policy VOICE
>> >> >>
>> >> >> Any thoughts?
>> >> >>
>> >> >> Thanks, Tim
>> >> >>
>> >> >> ----- Original Message -----
>> >> >> From: "Bob Sinclair" <bsin@cox.net>
>> >> >> To: "Anas Tarsha" <ra3i@yahoo.com>;"Group Study"
>> > <ccielab@groupstudy.com>
>> >> >> Sent: Saturday, December 06, 2003 9:51 PM
>> >> >> Subject: Re: CAR vs Police
>> >> >>
>> >> >>
>> >> >> > Anas,
>> >> >> >
>> >> >> > I would agree that Cisco could do a better job of explaining the
>> >> > policing
>> >> >> > mechanism in the MQC, but I think I would disagree that it
>> >> >> > permits
>> >> >> buffering
>> >> >> > during congestion. There are Bc and Be parameters, but according
> to
>> >> >> > the
>> >> >> > documentation this does not buffer packets to shape the traffic.
>> >> >> > The
>> >> > best
>> >> >> > explanation I have found is at the link below, which says that
>> >> >> > the
>
>> >> > policer
>> >> >> > does not buffer, but "drops packets less aggressively" during
>> >> > congestion.
>> >> >> > Could you check it out and see what you think of it?
>> >> >> >
>> >> >> >
>> >> >>
>> >> >
>> >
> http://www.cisco.com/en/US/partner/tech/tk543/tk545/technologies_q_and_a_item09186a00800cdfab.shtml#Q24
>> >> >> >
>> >> >> > Thanks!
>> >> >> >
>> >> >> > -Bob Sinclair
>> >> >> > CCIE #10427, CISSP, MCSE
>> >> >> >
>> >> >> >
>> >> >> > bsinclair@netmasterclass.net
>> >> >> > ----- Original Message -----
>> >> >> > From: "Anas Tarsha" <ra3i@yahoo.com>
>> >> >> > To: "Bob Sinclair" <bsin@cox.net>; "ccie2be"
>> >> >> > <ccie2be@nyc.rr.com>;
>> >> > "Group
>> >> >> > Study" <ccielab@groupstudy.com>
>> >> >> > Sent: Saturday, December 06, 2003 9:07 PM
>> >> >> > Subject: Re: CAR vs Police
>> >> >> >
>> >> >> >
>> >> >> > > Also theoretically there is a major difference between
>> >> >> > > CAR and policing, a difference which Cisco hardly
>> >> >> > > explains it well in my opinion. CAR is a rate-limit
>> >> >> > > mechanism to limit the input or output transmission
>> >> >> > > rate on an interface or subinterface based on a
>> >> >> > > configured value. All the exceeding traffic is dropped
>> >> >> > > in case the exceeding action is dropping. Policing is
>> >> >> > > more like a shaping mechanism. As the name implies,
>> >> >> > > shaping does not drop packets in case of congestion,
>> >> >> > > it buffers them. You will see delay but no data loss.
>> >> >> > > So this is the major difference, CAR does not buffer.
>> >> >> > >
>> >> >> > > Anas
>> >> >>
>> >> >>
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>> >> >
>> >> >
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>
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