From: MADMAN (dmadlan@qwest.com)
Date: Tue Jun 01 2004 - 13:13:39 GMT-3
Don't worry about it the frame switch will mark packets over CIR for
you at no addititional charge.
Generally it is a bad idea, let the switch to the DE labeling.
Dave
Peng Zheng wrote:
> But how can I only set DE for those traffic over
> 128kbps?
>
> --- "James R. Yeo" <james@net-brigade.com> wrote:
>
>>Hope this helps:
>>
>>Read below or go to link instead:
>>
>>
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/12
>
>>2tcr/122twr/wftfr1.htm#1018321
>>
>>Straight from the documentation
>>
>>frame-relay de-list
>>To define a discard eligibility (DE) list specifying
>>the packets that have
>>the DE bit set and thus are eligible for discarding
>>when congestion occurs
>>on the Frame Relay switch, use the frame-relay
>>de-list command inglobal
>>configurationmode. To delete a portion of a
>>previously defined DE list,
>>use the no form of this command.
>>
>>frame-relay de-list list-number {protocol protocol |
>>interface type
>>number} characteristic
>>no frame-relay de-list list-number {protocol
>>protocol | interface type
>>number} characteristic
>>Syntax Description
>>
>>list-number
>> Number of the DE list.
>>
>>protocol protocol
>> One of the following values corresponding to a
>>supported protocol or
>>device:
>>
>>arpAddress Resolution Protocol.
>>appletalkAppleTalk.
>>bridgebridging device.
>>clnsISO Connectionless Network Service.
>>clns_esCLNS end systems.
>>clns_isCLNS intermediate systems.
>>compressedtcpCompressed TCP.
>>decnetDECnet.
>>decnet_nodeDECnet end node.
>>decnet_router-L1DECnet Level 1 (intra-area) router.
>>decnet_router-L2DECnet Level 2 (interarea) router.
>>ipInternet Protocol.
>>ipxNovell Internet Packet Exchange Protocol.
>>
>>interface type
>> One of the following interface types: serial, null,
>>or ethernet.
>>
>>number
>> Interface number.
>>
>>characteristic
>> One of the following values:
>>
>>fragmentsFragmented IP packets
>>gt bytesSets the DE bit for packets larger than the
>>specified number of
>>bytes (including the 4-byte Frame Relay
>>encapsulation).
>>list access-list-numberPreviously defined access
>>list number.
>>lt bytesSets the DE bit for packets smaller than
>>the specified number of
>>bytes (including the 4-byte Frame Relay
>>encapsulation).
>>tcp portTCP packets to or from a specified port.
>>udp portUser Datagram Protocol (UDP) packets to or
>>from a specified port.
>>
>>
>>
>>Defaults
>>
>>Discard eligibility is not defined.
>>
>>Command Modes
>>
>>Global configuration
>>
>>Command History
>>
>>Release Modification
>>10.0
>> This command was introduced.
>>
>>12.2(13)T
>> The apollo, vines, and xns arguments were removed
>>because Apollo Domain,
>>Banyan VINES, and Xerox Network Systems are no
>>longer available in the
>>Cisco IOS software.
>>
>>
>>
>>Usage Guidelines
>>
>>To remove an entire DE list, use the no form of this
>>command with no
>>options and arguments.
>>
>>This prioritizing feature requires that the Frame
>>Relay network be able to
>>interpret the DE bit as indicating which packets can
>>be dropped first in
>>case of congestion, or which packets are less time
>>sensitive, or both.
>>
>>When you calculate packet size, include the data
>>packet size, the ICMP
>>header, the IP header, and the Frame Relay
>>encapsulation bytes. For
>>example, count 92 bytes of data, 8 bytes for the
>>ICMP header, 20 bytes for
>>the IP header, and 4 bytes for the Frame Relay
>>encapsulation, which equals
>>124 bytes.
>>
>>Examples
>>
>>The following example specifies that IP packets
>>larger than 512 bytes
>>(including the 4-byte Frame Relay encapsulation)
>>will have the DE bit set:
>>
>>frame-relay de-list 1 protocol ip gt 512
>>
>>
>>Kind regards
>>
>>James Yeo
>>
>>
>>
>>On Tue, 1 Jun 2004 00:55:24 -0700 (PDT), Peng Zheng
>><zpnist@yahoo.com>
>>wrote :
>>
>>
>>>Requirement: configure traffic-shaping, set DE for
>>
>>all
>>
>>>traffic over 128kbps.
>>>
>>>How can I gurantee the traffic will be set DE bit?
>>>
>>>
>>>
>>>
>>>
>>>
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>
>
>
>
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-- David Madland CCIE# 2016 Sr. Network Engineer Qwest Communications 612-664-3367"Emotion should reflect reason not guide it"
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