From: marvin greenlee (marvin@ccbootcamp.com)
Date: Wed Mar 02 2005 - 20:12:56 GMT-3
The extended headroom varies by platform and version.
** 3640 with 12.3T8 **
Router>show ip spd
Current mode: normal.
Queue min/max thresholds: 73/74, Headroom: 100, Extended Headroom: 75
IP normal queue: 0, priority queue: 0.
SPD special drop mode: none
Router>
** 3640 with 12.2T15 **
Router#show ip spd
Current mode: normal.
Queue min/max thresholds: 73/74, Headroom: 100, Extended Headroom: 10
IP normal queue: 0, priority queue: 0.
SPD special drop mode: none
Router#
** 2500 w/12.2.1d **
Router#show ip spd
Current mode: normal.
Queue min/max thresholds: 73/74, Headroom: 100
IP normal queue: 0, priority queue: 0.
SPD special drop mode: none
Router#
Here's a copy of the link for those without partner access:
Understanding Selective Packet Discard (SPD)
http://www.cisco.com/en/US/products/hw/routers/ps167/products_tech_note09186
a008012fb87.shtml
Marvin Greenlee, CCIE#12237, CCSI# 30483
Network Learning Inc
marvin@ccbootcamp.com
www.ccbootcamp.com (Cisco Training)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dennis J. Hartmann
Sent: Wednesday, March 02, 2005 2:53 PM
To: Dave Meyer
Cc: ccielab@groupstudy.com
Subject: RE: LLQ for eigrp [bcc][faked-from][bayes]
Importance: Low
You're only reserving 100% of the reservable space. If the input
queue support 75 packets (I believe that's the router default), the SPD
process adds 100 packets of "headroom" used by system protocols. There's
also some extended headroom (I forget how much extra room that is).
Sincerely,
Dennis J. Hartmann
White Pine Communications
dh8@pobox.com
CCSI/CCIP/CCNP/CCDP/CCNA/CCDA
Cisco IP Voice Support & Design Specialist
Cisco Optical, VPN & IDS Specialist
MCSE
-----Original Message-----
From: Dave Meyer [mailto:dave.meyer@db.com]
Sent: Wednesday, March 02, 2005 1:23 PM
To: Dennis J. Hartmann
Cc: ccielab@groupstudy.com
Subject: RE: LLQ for eigrp
How much does it allocate by default ? If I have max-reserve set to 100%( in
theory) & CBWFQ enabled, where does it take BW from ?
Regards,
Dave
______________________________________________
Architecture & Engineering
Work: (201) 593-5545
Cell: (973) 907-4963
"Dennis J. Hartmann" <dennisjhartmann@hotmail.com> Sent by:
nobody@groupstudy.com
03/02/2005 12:20 PM
Please respond to "Dennis J. Hartmann"
To: Dave Meyer/NewYork/DBNA/DeuBa@DBNA, "'Brian McGahan'"
<bmcgahan@internetworkexpert.com>
cc: <ccielab@groupstudy.com>, "'Tom Young'"
<gitsyoung@yahoo.co.jp>,
<nobody@groupstudy.com>
Subject: RE: LLQ for eigrp
All routing protocols and router based telnet sessions are
sent as IP Prec 6 (cs6) by default. The router will automatically
prioritize this using an internal algorithm known as SPD (selective packet
discard).
Tuning
the SPD headroom is a hidden command.
To my knowledge, SPD is on whether you're running WFQ,
CBWFQ, or LLQ.
I'm not sure that answered your question though....
-Dennis Hartmann
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Dave
Meyer
Sent: Wednesday, March 02, 2005 10:30 AM
To: Brian McGahan
Cc: ccielab@groupstudy.com; Tom Young; nobody@groupstudy.com
Subject: RE: LLQ for eigrp
Brian,
From my understanding OSPF does not land in the default queue when doing
CBWFQ nor does it get bundled with the L2 traffic partitioned by the
max-reserve.
Is there a way to verify where the pak-priority labeled traffic is going as
it leaves the router ?
Regards,
Dave
______________________________________________
Architecture & Engineering
Work: (201) 593-5545
Cell: (973) 907-4963
"Brian McGahan" <bmcgahan@internetworkexpert.com> Sent by:
nobody@groupstudy.com
03/01/2005 11:27 AM
Please respond to "Brian McGahan"
To: "Tom Young" <gitsyoung@yahoo.co.jp>,
<ccielab@groupstudy.com>
cc:
Subject: RE: LLQ for eigrp
Tom,
The router has an internal mechanism to do this already.
It is
an internal tag called "pak_priority". RIP, OSPF, and IS-IS packets
generated by the router are tagged pak_priority, and I would assume EIGRP is
as well.
For more information see:
http://www.cisco.com/warp/public/105/rtgupdates.html
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987 x 705
Outside US: 775-826-4344 x 705
24/7 Support: http://forum.internetworkexpert.com
Live Chat: http://www.internetworkexpert.com/chat/
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Tom Young
> Sent: Tuesday, March 01, 2005 3:58 AM
> To: ccielab@groupstudy.com
> Subject: LLQ for eigrp
>
> Hi, group
>
> I heard the LLQ configuration is work well for voice packet, not work
> well for application traffic. Because almost all of applications
> traffic has the brast character . Does it right ?
> I want to use the LLQ for eigrp packet between HQ and remote office,
> because the traffic is large between them, I worry about the date
> transfer will effect on the eigrp so that the network topology
> couldn't keep stability. How about your suggestion?
>
> thanks alot
>
> __________________________________
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