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rate-limit precedence 5 mpls vpn

Hi there,

I'm trying to apply some QoS from PE1 to PE2 to guarantee some traffic. Below is the configuration:

PE1#sh run int mul1

Building configuration...

Current configuration : 513 bytes

!

interface Multilink1

description Cust_A_HQ

ip vrf forwarding CustA

ip address 10.10.10.241 255.255.255.252

rate-limit input access-group 181 512000 96000 192000 conform-action set-prec-transmit 5 exceed-action continue

rate-limit output access-group 181 512000 96000 192000 conform-action set-prec-transmit 5 exceed-action continue

ip route-cache flow

no cdp enable

ppp multilink

ppp multilink fragment delay 10

ppp multilink interleave

ppp multilink group 1

end

PE2

PE2#sh run int mul3

Building configuration...

Current configuration : 557 bytes

!

interface Multilink3

description Cust_A_East

ip vrf forwarding CustA

ip address 10.10.10.237 255.255.255.252

rate-limit input access-group 181 64000 12000 24000 conform-action set-prec-transmit 5 exceed-action set-prec-transmit 5

rate-limit output access-group 181 64000 12000 24000 conform-action set-prec-transmit 5 exceed-action set-prec-transmit 5

ip route-cache flow

load-interval 30

no cdp enable

ppp multilink

ppp multilink fragment delay 10

ppp multilink interleave

ppp multilink group 3

end

Based on the config above, are the traffic defined in the access-list 181 in PE1 and PE2 will be set a ip precedence in MPLS VPN cloud?

If I'm not mistaken, ip precedence value is not relevent in MPLS VPN because MPLS experimental bits are used to determine QoS treatment in the cloud. How true is this?

Some of the service provider in my area marking as ip precedence in their cloud.

Thanks in advanced.

maher

1 REPLY

Re: rate-limit precedence 5 mpls vpn

Hi Maher,

I would recommend class-based QoS configs, because you can set MPLS exp bits there. Nevertheless, because a PE copies the IP precedence into MPLS exp field by default it should still work. My doubt is just the interference with CEF and the rate-limit command ... still it should work.

In the MPLS cloud classification is based on exp bits. That is the only QoS marking a LSR can use because of label switching.

Hope this helps! Please rate all posts.

Regards, Martin

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