01-27-2009 10:16 AM - edited 03-04-2019 12:59 AM
We are using Class of Service with our MPLS VPN provider for voice/critical data. I would like to have our edge router configuration verified. I wasn't sure about marking on the egress interface (multilink1). Is this ok?
class-map match-any dscp26
match access-group 100
class-map match-any dscp46
match ip dscp ef
!
!
policy-map QoS
class dscp46
priority percent 35
class dscp26
bandwidth percent 25
set ip dscp af31
class class-default
fair-queue
interface Multilink1
bandwidth 3088
ip address 192.168.14.21 255.255.255.252
no ip redirects
no ip unreachables
no ip proxy-arp
ip accounting output-packets
ip flow ingress
load-interval 30
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
service-policy output QoS
access-list 100 permit ip host 192.168.32.55 host 172.18.1.156
01-27-2009 10:48 AM
You will need to have similar config for Class dscp46 be applied in class26. The Applied QoS policy on the Multilink should contain DSCP matches on both classes.
You will also need to contact the provider to see what kind Of QoS policies they apply? They are 3 different models of MPLS QoS:
a- Uniform Model b- short Pipe Model
c- Short model.
So, either they preserve ur QoS policy u already applied OR they could apply their Own QoS policy for You.
Hope it helps,
Mohamed
01-27-2009 11:11 AM
Thanks Mohamed. Could you please show an example of what you mean by "similar config" for the classification? I have the provider's router config but I'm not sure what model they use:
interface Multilink110
ip vrf forwarding V6526:isigin
ip address 192.168.14.22 255.255.255.252
no ip directed-broadcast
no peer neighbor-route
no cdp enable
ppp multilink
no ppp multilink fragmentation
multilink-group 110
service-policy output ipcos-isigin-Q1B9
policy-map ipcos-isigin-Q1B9
class dscp46
priority
police rate percent 35
class dscp26
bandwidth percent 25
class-map match-any dscp46
match ip dscp 46
class-map match-any dscp26
match ip dscp 26
01-27-2009 11:27 AM
Mike,
What I meant by similar config is the folowing:
In the Policy-Map Qos, u have class dscp26, u shouldnt set Dscp within this class, but u should match the DSCP which was already set Inbound direction. Ur last sample Config is correct, removing (Set ip dscp af31) from class dscp26 is desired.
On the Other hand, If a Service Provider uses Pipe Model, then ur QoS config wont be reserved, The Only Model that preserve ur config is (Short Pipe Model), thats why I mentioned 2 ask the SP whether they preserve ur QoS policy or Not.
HTH
Mohamed
01-27-2009 05:29 PM
I believe, you should be able to run the policy on multilink interface.
Some suggestions:
On most platforms, don't use FQ within class-default if you really need to guarantee class dscp26 a certain amount of bandwidth. (Use a bandwidth statement within class-default.)
You probably should mark the class-default as BE.
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