12-12-2013 07:33 AM - edited 03-04-2019 09:50 PM
Big question: Does the config below work? My stress tests shows its utilizing the bandwidth commands, but thats about all I can tell. I am unexpereienced with QoS. Help please!
(Also, this is a repost - I added to part above to help clarify, modified title to see if I can encourage anyone to take a stab at it....thanks!)
Environment:
Two branch locations that use MPLS to connect to a datacenter, and route to the internet through a hosted firewall at the datacenter. Configuration example below is from a branch MPLS router. Branch uses VOIP and some Core Vendor software (extremely network sensitive).
So the branches connect to each other and the internet via each of their MPLS routers (Cisco 1841's).
We want to accept any critiques, and know if the config below would work in general/at all. In particular I would like to ensure the Core Vendor traffic never drops/has too high of a latency.
In the current configuration I saw just 4 packets drops for the Core Vendor due to WRED attempting to avoid congestion.
Note: We set the DSCP values we do because those are the DSCP values that correspond to our ATT MPLS CoS values.
QoS Config Example: [updated 12/11/2013 4:30PM CST]
class-map match-any Internal_Traffic
match access-group 106
class-map match-any Core_Vendor
match access-group 108
class-map match-any RDP
match access-group 107
class-map match-any Voice
match access-group 105
!
!
policy-map ToMPLS
class Voice
set ip dscp ef
priority percent 15
class Core_Vendor
set ip dscp af31
bandwidth remaining percent 30
class Internal_Traffic
set ip dscp af21
bandwidth remaining percent 35
class class-default
set ip dscp default
bandwidth remaining percent 20
policy-map ToMPLS-QUEUE
class class-default
random-detect dscp-based
service-policy ToMPLS
policy-map ToMPLS-Tunnel
class class-default
shape average 1537000
service-policy ToMPLS-QUEUE
!
interface Tunnel0
description Tunnel to DATACENTER
bandwidth 1540
qos pre-classify
tunnel source Serial0/0/0
!
interface Tunnel1
description Tunnel to OTHER BRANCH
bandwidth 1540
qos pre-classify
tunnel source Serial0/0/0
!
interface Serial0/0/0
description DHEC......etc...
encapsulation ppp
service-module t1 timeslots 1-24
service-module t1 remote-alarm-enable
service-policy output ToMPLS-Tunnel
!
12-12-2013 07:47 AM
Also, would it be possible to enable Priority instead of Bandwidth on the Core_Vendor class, and then disable policing?
My thinking is we want the Core_Vendor traffic to have low-latency-queuing, but not be penalized when it exceeds its given bandwidth.
Is there a better way to do that?
12-12-2013 12:29 PM
Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
If this post is in lieu of another post, delete that one.
You don't need to shape if your physical port is the same as CDR.
On your branch, it appear you may only need the ToMPLS policy on the serial interface (you don't need the other two policies, you'll still need your pre-classify on the tunnels).
PS:
If you don't have them, you may want the following commands on your tunnel interfaces:
ip mtu 1476 !for just GRE
ip tcp adjust-mss 1436 !for just GRE
keepalive 10 3 !optional - takes down tunnel if end-to-end lost - helpful if using snmp
tunnel path-mtu-discovery
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide