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Community Member

MTU Issues

Hi

Topology:

A--DS/PE---CORE/P---ISP/PE--P---ISP/PE--B

AS per above topology,am not able to transfer files with MTU frame size above 1492 though the MTU configured on interface is 1500.The link between DS/PE---CR/PE is mpls enabled i have configured the MTU size to 1524 to carry extra labels of MPLS as recommended by cisco.

When i do extnded ping from DS/PE above MTU size of 1492 with even DF bit not set am not able to ping customer end (B),

AND also i tried with DF bit set am not able to recieve any notifications ICMP destination unreacheable messages.

The file transfer from customer B with packet size above 1492 are received by customer A but when the connection are initiated through customer A they are not.

Within an enterprise it works with larger MTU size when tried to ping from DS loopback to core loopback.How can i troubleshoot it is a problem through my end or from the ISP.

response will be appreciated

2 REPLIES
Cisco Employee

Re: MTU Issues

Altaf,

Is this l2vpn or l3vpn in the core. What are the devices used for PE and P routers?

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: MTU Issues

Thanks hritter,

The issue is solved.

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