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New Member

MPLS over GRE Tunnel

Hi,

Can any one guide me about the benefits of MPLS over GRE Tunnels. Do this serve the purpose of MPLS (except TE, which is suppose is not possible on GRE Tunnels) as Layer-3 is already involved before Label Switching even starts.

thanx and regards,

Shakeel Ahmad

3 REPLIES
Cisco Employee

Re: MPLS over GRE Tunnel

One benefit of using MPLS over GRE would be to extend an MPLS core through an SP that doesn't support MPLS whatsoever.

Hope this helps,

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
New Member

Re: MPLS over GRE Tunnel

I have a problem with MPLS over GRE. When i try to apply a policy to shape the traffic it seems that the default-class dosent see the mpls packets.

Im trying to shape the traffic to 256k but it seems that the shaping never are activated.

Anyone have any idea how to solve this?

Example:

class-map match-all PING

match access-group 171

!

!

policy-map class-default

class PING

bandwidth percent 15

policy-map PING

class class-default

shape average 256000

service-policy class-default

INterfacexx

service-policy output PING

access-list 171 permit icmp any any

Re: MPLS over GRE Tunnel

Hello,

with your access-list you are searching for ICMP. As those are encapsulated in GRE and then in MPLS this traffic is not ICMP.

Even without MPLS your class PING would not get the ICMP as only GRE packets are crossing the interface.

What you could try is to use "qos pre-classify" on the GRE tunnel this works without MPLS.

Hope this helps!

Martin

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