From: Kayode Oladipo (kayoladipo@hotmail.com)
Date: Tue May 30 2006 - 04:23:10 ART
Hi David,
Another question, how do you setup LFI on an ethernet interface to
prevent serialisation delay if the WAN bandwidth on the ethernet is say
64K?
Kayode
--------------------------------------------------------------------
From: "David Bombal" <davidbombal@davidbombal.com>
Reply-To: "David Bombal" <davidbombal@davidbombal.com>
To: "'Jens Petter'" <jenseike@start.no>, <ccielab@groupstudy.com>
Subject: RE: voice prioritizing
Date: Mon, 29 May 2006 22:45:28 +0100
>Hi Jens,
>
>Cool - looks like the config got a little mesed up - if you need it
again or
>more, drop me a mail.
>
>David Bombal
>CCIE (R&S), CCSI, CCIP, CCSP etc
>http://www.ConfigureTerminal.com
>
>
>
>-----Original Message-----
>From: Jens Petter [mailto:jenseike@start.no]
>Sent: 29 May 2006 22:42
>To: 'David Bombal'; ccielab@groupstudy.com
>Subject: RE: voice prioritizing
>
>Yes David. This was exactly what I was looking for.. This takes me
in the
>right direction...
>Thanks very much..
>
>JP
>
>-----Original Message-----
>From: David Bombal [mailto:davidbombal@davidbombal.com]
>Sent: 29. mai 2006 23:27
>To: 'Jens Petter'; ccielab@groupstudy.com
>Subject: RE: voice prioritizing
>
>Hi Jens,
>
>With QOS, a method to differentiate different types of traffic is
required.
>The best method for this is to mark the DSCP value within the IP TOS
field.
>The value for voice is normally set to 46 known as Expedited
forwarding
>(EF). A Cisco IP Phone will mark its traffic with EF by default. All
other
>network devices then need to trust this value. There are various
ways to do
>classification - below is an example.
>
>The best way to prioritize voice on the WAN is using Low Latency
Queuing
>(LLQ). It has a priority queue to make sure that voice is always
serviced
>first. There are other things to consider though such as packet
drops (WRED
>is used to prevent this) and serialization delay (LFI is used to
prevent
>this).
>
>On the LAN there are a few queuing methods, but on a 3550 for
example,
>Weighted Round Robin (WRR) with expedite queuing is normally used.
>
>I hope this helps - see below an example config
>
>David Bombal
>CCIE (R&S), CCSI, CCIP, CCSP etc
>http://www.ConfigureTerminal.com
>
>Catalyst 3550-Conditionally-Trusted IP Phone + PC + Scavenger
(Basic) Model
>Configuration
>
>CAT3550(config)#mls qos map cos-dscp 0 8 16 24 32 46 48 56 !
Modifies
>CoS-to-DSCP mapping to map CoS 5 to DSCP EF CAT3550(config)#mls qos
map
>policed-dscp 0 24 to 8 ! Excess DVLAN & VVLAN traffic will be
remarked to
>Scavenger (CS1) CAT3550(config)# CAT3550(config)#
CAT3550(config)#class-map
>match-all VOICE CAT3550(config-cmap)# match ip dscp 46 ! DSCP EF
(voice)
>CAT3550(config-cmap)#class-map match-any CALL SIGNALING ! Need
'match-any'
>here
>CAT3550(config-cmap)# match ip dscp 26 ! DSCP AF31 (old
Call-Signaling)
>CAT3550(config-cmap)# match ip dscp 24 ! DSCP CS3 (new
Call-Signaling)
>CAT3550(config-cmap)# CAT3550(config-cmap)#class-map match-all
VVLAN-VOICE
>CAT3550(config-cmap)# match vlan 110 ! VLAN 110 is VVLAN
>CAT3550(config-cmap)# match class-map VOICE ! Matches VVLAN DSCP EF
>CAT3550(config-cmap)# CAT3550(config-cmap)#class-map match-all
>VVLAN-CALL-SIGNALING CAT3550(config-cmap)# match vlan 110 ! VLAN 110
is
>VVLAN CAT3550(config-cmap)# match class-map CALL SIGNALING !Matches
VVLAN
>AF31/CS3 CAT3550(config-cmap)# CAT3550(config-cmap)#class-map
match-all ANY
>CAT3550(config-cmap)# match access-group name ANY ! Workaround ACL
>CAT3550(config-cmap)# CAT3550(config-cmap)#class-map match-all
VVLAN-ANY
>CAT3550(config-cmap)# match vlan 110 ! VLAN 110 is VVLAN
>CAT3550(config-cmap)# match class-map ANY ! Matches any other VVLAN
traffic
>CAT3550(config-cmap)# CAT3550(config-cmap)#class-map match-all
DVLAN-ANY
>CAT3550(config-cmap)# match vlan 10 ! VLAN 10 is DVLAN
CAT3550(config-cmap)#
>match class-map ANY ! Matches all DVLAN traffic
CAT3550(config-cmap)#
>CAT3550(config-cmap)#policy-map IPPHONE+PC-BASIC
CAT3550(config-pmap)#class
>VVLAN-VOICE CAT3550(config-pmap-c)# set ip dscp 46 ! DSCP EF (Voice)
>CAT3550(config-pmap-c)# police 128000 8000 exceed-action drop ! Only
one
>voice call is permitted per switchport VVLAN
CAT3550(config-pmap-c)#class
>VVLAN-CALL-SIGNALING CAT3550(config-pmap-c)# set ip dscp 24 ! DSCP
CS3
>(Call-Signaling) CAT3550(config-pmap-c)# police 32000 8000
exceed-action
>policed-dscp-transmit ! Out-of-profile call signaling is marked down
to
>Scavenger (CS1) CAT3550(config-pmap-c)#class VVLAN-ANY
>CAT3550(config-pmap-c)# set ip dscp 0 CAT3550(config-pmap-c)# police
32000
>8000 exceed-action policed-dscp-transmit ! Unauthorized VVLAN
traffic is
>marked down to Scavenger (CS1) CAT3550(config-pmap-c)#class
DVLAN-ANY
>CAT3550(config-pmap-c)# set ip dscp 0 CAT3550(config-pmap-c)# police
5000000
>8000 exceed-action policed-dscp-transmit ! Out-of-profile data
traffic is
>marked down to Scavenger (CS1) CAT3550(config-pmap-c)# exit
>CAT3550(config-pmap)#exit CAT3550(config)# CAT3550(config)#interface
>FastEthernet0/1 CAT3550(config-if)# switchport access vlan 10 !
DVLAN
>CAT3550(config-if)# switchport voice vlan 110 ! VVLAN
CAT3550(config-if)#
>mls qos trust device cisco-phone ! Conditional Trust
CAT3550(config-if)#
>service-policy input IPPHONE+PC-BASIC ! Attaches policy
>CAT3550(config-if)#exit CAT3550(config)#
>
>
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of Jens
>Petter
>Sent: 29 May 2006 16:29
>To: ccielab@groupstudy.com
>Subject: voice prioritizing
>
>Hi group...
>
>
>
>What are the best method to prioritize voice traffic over a wan...
>
>
>
>Say this is the topology :
>
>
>
>
>
>Switch-----router-(router-(wan)---router)----router-------switch
>
>
>
>
>
>We have tree classes, voice-interactive and default. I am going to
classify
>the interactive traffic based on ip range and port.
>
>So what I am trying to deside on is what the best method to classify
the
>voice traffic is going to be.. I am trying to decide both what to do
on the
>switches and also in the wan.
>
>
>
>
>
>I know this is a basic Q, but I am not that familiar with QoS and
need this
>help now.
>
>
>
>Let me know if you guys need more info about this
>
>
>
>Thanks in advance
>
>_______________________________________________________________________
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