12-31-2008 04:27 AM - edited 03-04-2019 03:17 AM
Hi
In our organization we have an MPLS from from centre A to Centre B. On this MPLS we need to dedicate 512kbps of bandwidth just for two IP's between centre A & B respectively. Moreover the MPLS is managed by the ISP's. All we do is provide static routes on the router pointing to the next hop.
I had planned to do the following PBR configuration on the routers :
access-list 1 permit 172.16.x.x
class-map match-all innovation
match access-group 1
!
!
policy-map innovation
class CUSTOMERX
bandwidth percent 20
interface Fa0/0
bandwidth 4000
service-policy output CUSTOMERX
However the service providers have asked me to do DSCP markings. I need help on the same.
12-31-2008 04:47 AM
Hello Solomon,
you need to mark traffic as enters the lan interface
access-list 11 permit 172.16.x.x
class-map match-all innovation1
match access-group 11
policy-map mark_dscp
class innovation1
set ip dscp
int f0/1
desc internal lan
service-policy input mark_dscp
traffic sent out f0/0 to provider will be marked if sourced from the subnet
the provider will use the DSCP settings to provide end-to-end QoS according to diffserv model
Hope to help
Giuseppe
12-31-2008 05:10 AM
Hi Giuseppe
Thanks a lot for the reply. i also have one more query. Do i have to do this configuration
on the interface between the router and the switch in the LAN. More specifically should i do the configuration ont the router?.
Also after i do thid configuration on the LAN, i need to do the configurations that i had previoulsy sent also right?
12-31-2008 03:37 PM
Hello Solomon,
yes on the internal LAN means where the traffic is received on the router.
the configuration has to be done on the router and you can use your configuration outbound on f0/0 the WAN interface.
Or you can use a different configuration like the one suggested by Joseph.
Another option is to define the class map based on the DSCP value on the outbound service policy, so that you can have your own counters of what traffic marked you are sending to the provider
Happy New Year
Hope to help
Giuseppe
12-31-2008 04:11 PM
Giuseppe
Just wanted to say Happy New Year and hope you continue to stay in these forums in the coming year.
Your'e knowledge and experience have helped so many people.
Jon
01-01-2009 01:58 AM
Hello Jon,
Happy New Year to you too and to all people that make these forums useful and a plesant place.
My personal hope is that taking part in the forums help to stay tuned with new topics and to make easier to recertify.
I can say I've learned a lot about devices or concepts I haven't worked on directly.
Best Regards
Giuseppe
12-31-2008 04:56 AM
Your post appears to be CBWFQ, nor PBR?
If only just the two sites are attached to the MPLS cloud, i.e. you logically have a p-2-p link, you shouldn't need to set DSCP markings. Just an outbound service policy should work, although with yours, I believe the default FQ in (implicit) class-default would preclude your bandwidth guarantee (on most platforms). The latter, if an issue, can be adjusted by setting the class-default to use FIFO.
If you have multiple sites on the MPLS cloud, then beside using your policy as you've posted you will also need to set a ToS marking so that the MPLS provider can guarantee bandwidth at MPLS egress. In the latter IOS images, simply set dscp xx or set ip dscp xx in the policy map class. What marking to use will depend on what your MPLS provider offers.
e.g.
access-list 1 permit 172.16.x.x
class-map match-all innovation
match access-group 1
!
!
policy-map innovation
class CUSTOMERX
bandwidth percent 20
set ip dscp af31
interface Fa0/0
bandwidth 4000
service-policy output CUSTOMERX
[edit]
PS:
BTW: Since you have a Ethernet handoff, but only have(?) 4 Mbps MPLS bandwidth, it might be a very good idea to shape your outbound to 4 Mbps too. (Without using MPLS provider ToS markings, you'll need to shape. With ToS markings, you won't need to shape provided the provider won't drop any taffic in excess of 4 Mbps on MPLS ingress.)
12-31-2008 05:19 AM
Thanks Joseph,
So, will the above kind of marking huarantee that the two IP's at the two centre's would have 512kbps of bandwidth and not more than that?....
12-31-2008 05:29 AM
ToS markings for MPLS depend on the provider. Usually they offer various classes with a certain minimum percentages of bandwidth. Some allow you to select different profiles for bandwidth allocations per class. Provider should be able to provide documentation.
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