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Community Member

Egress blocking / Speed Mismatch in MPLS

I connect multiple sites through a full mesh MPLS cloud. My main site has a 45Mbps DS3 connection into the cloud and the other sites have varying speeds 2-20 Mbps. How do I prevent the smaller sites from being overloaded with traffic by the main sites?

5 REPLIES
Cisco Employee

Re: Egress blocking / Speed Mismatch in MPLS

Dan,

The best way would be to do traffic shaping per remote site on the main (hub) site.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Community Member

Re: Egress blocking / Speed Mismatch in MPLS

Hi hr, can you be a little more specific. Are you saying that I should (on a per site basis) create class maps for all traffic (obviously I can use class default) and then a policy map with explicit bandwidth statements that equals the total bandwidth of the remote site? I only have a single connection into the MPLS cloud so I can only apply one "service policy output" to that interface and with 30 sites I am not going to be able to specify enough bandwidth for each site.

Best regards,

Dan

Cisco Employee

Re: Egress blocking / Speed Mismatch in MPLS

Dan,

What I meant is that you need to identify the traffic destined to each spoke site, map it to a separate class-map and perform traffic shaping for each and every one of these class-maps (similar to per DLCI traffic shaping with FrameRelay). This is the only way you can guarantee that you will not overwhelm the remote site link.

policy-map MPLS_Sites

class Site_1

match access-group Sites1

shape average 1540000

class Site_2

match access-group Sites2

shape average 512000

...

...

...

class Site_n

match access-group Sitesn

shape average 512000

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Community Member

Re: Egress blocking / Speed Mismatch in MPLS

Thanks hr, since I am also using LLQ would the following config be correct.

class-map match-all VIDEO

match dscp af31

class-map match-all VOICE

match dscp ef

!

class-map match-all SITE_1

match access-group name SITE-1-SUBNETS

class-map match-all SITE_2

match access-group name SITE-2-SUBNETS

class-map match-all SITE_3

match access-group name SITE-3-SUBNETS

!

!

policy-map SITE_LLQ

class VOICE

priority percent 20

class VIDEO

bandwidth percent 30

class class-default

fair-queue

random-detect

!

policy-map MPLS_SITES

class SITE_1

shape average 2000000

service-policy SITE_LLQ

class SITE_2

shape average 512000

service-policy SITE_LLQ

class SITE_3

shape average 15440000

service-policy SITE_LLQ

class class-default

Dan

Cisco Employee

Re: Egress blocking / Speed Mismatch in MPLS

Hi Dan,

This would be the correct approach indeed.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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