From: Nathasha Aleyevka (naleyevka@yahoo.com)
Date: Tue Jan 06 2004 - 18:39:01 GMT-3
Thank you Brian/Ozgur
--- Brian McGahan <bmcgahan@internetworkexpert.com>
wrote:
> Nathasha,
>
> When you create a class-map it is "match-all" by
> default. This
> means that all match statements in the class must be
> true for the class to
> be true. For example, suppose you want to match the
> SQL Slammer worm. It
> used udp port 1434 and had a packet length of 404
> bytes:
>
> access-list 100 permit udp any any eq 1434
> !
> class-map match-all SQL_SLAMMER
> match access-group 100
> match packet length min 404 max 404
>
> The above says that the packet must be destined for
> udp port 1434,
> and have a length of 404.
>
> For the "match-any", it is a logical or. As long
> as any of the
> match statements are true then the class is true.
> For example, let's say
> you want to match peer-to-peer traffic:
>
> class-map match-any PEER-TO-PEER
> match protocol kazaa2
> match protocol gnutella
> match protocol fasttrack
>
> In the above case a "match-all" would not be
> appropriate because the
> traffic can't be kazaa ver 2 and gnutella at the
> same time.
>
> Lastly, the default class of "class-default" is
> automatically
> created for you, and is a FIFO queue unless
> otherwise specified:
>
> ip cef
> !
> policy-map QOS
> class PEER-TO-PEER
> priority percent 99
> class SQL_SLAMMER
> drop
> !
> interface Ethernet0/0
> max-reserved-bandwidth 100
> service-policy output QOS
>
> Router#show policy int e0/0
> Ethernet0/0
>
> Service-policy output: QOS
>
> Class-map: PEER-TO-PEER (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: protocol kazaa2
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Match: protocol gnutella
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Match: protocol fasttrack
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Queueing
> Strict Priority
> Output Queue: Conversation 264
> Bandwidth 99 (%)
> Bandwidth 9900 (kbps) Burst 247500 (Bytes)
> (pkts matched/bytes matched) 0/0
> (total drops/bytes drops) 0/0
>
> Class-map: SQL_SLAMMER (match-all)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: access-group 100
> Match: packet length min 404 max 404
> drop
>
> Class-map: class-default (match-any)
> <---default class
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
>
> If you want to change the options of the default
> class you can:
>
> policy-map QOS
> class PEER-TO-PEER
> priority percent 99
> class SQL_SLAMMER
> drop
> class class-default
> fair-queue
> random-detect
>
> Router#show policy int e0/0 | begin class-default
> Class-map: class-default (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
> Queueing
> Flow Based Fair Queueing
> Maximum Number of Hashed Queues 256
> (total queued/total drops/no-buffer drops)
> 0/0/0
> exponential weight: 9
>
> class Transmitted Random drop Tail drop
> Minimum Maximum Mark
> pkts/bytes pkts/bytes
> pkts/bytes thresh thresh
> prob
> 0 0/0 0/0 0/0
> 20 40 1/10
> 1 0/0 0/0 0/0
> 22 40 1/10
> 2 0/0 0/0 0/0
> 24 40 1/10
> 3 0/0 0/0 0/0
> 26 40 1/10
> 4 0/0 0/0 0/0
> 28 40 1/10
> 5 0/0 0/0 0/0
> 30 40 1/10
> 6 0/0 0/0 0/0
> 32 40 1/10
> 7 0/0 0/0 0/0
> 34 40 1/10
> rsvp 0/0 0/0 0/0
> 36 40 1/10
>
>
> HTH,
>
> Brian McGahan, CCIE #8593
> bmcgahan@internetworkexpert.com
>
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
> Toll Free: 877-224-8987
> Direct: 708-362-1418 (Outside the US and Canada)
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com
> [mailto:nobody@groupstudy.com] On Behalf Of
> > Nathasha Aleyevka
> > Sent: Tuesday, January 06, 2004 2:43 PM
> > To: ccielab@groupstudy.com; cisco@groupstudy.com
> > Subject: Simple Q:CBWFQ !
> >
> > I have been working on CBWFQ
> > config and have a question regarding class-map
> > creation.
> >
> > I defined the class maps for protocols X, Y and Z,
> > then create a policy and finally applied it to an
> > interface
> >
> > class-map match-any X
> > match protocol X
> >
> >
> > class-map match-any Y
> > match protocol Y
> >
> > class-map match-any Z
> > match protocol Z
> >
> > Q1: When do I use match-all vs match-any?
> > Q2: For the rest of the traffic do I need to
> define a
> > class-map match "class-default" or
> > class-map match Other-- does it matter?
> > Thank you
> > Nathasha
> >
> >
> > __________________________________
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> >
>
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