Subject: Re: Fragmentation and reassembly of MPLS packets

From: [email-masked]
Date: 15 May 2001 01:54:32 -0700

Hi Mohit,
    If my understanding is correct, its impossible to do fragmentation without IP header.  one has to remove (preserve for later use) MPLS label stack and check IP DF bit in IP header. If its set generate ICMP packets otherwise, fragment IP packet keep the depth of the label stack in mind and reconstruct the fragmented packets with MPLS label stack and forwards those based on the top label. At the egress IP module will reconsruct the IP packet when it gets from MPLS module.

If I am wrong pls correct me.

Thanks
YTR    

On Tue, 15 May 2001, [email-masked] wrote:

> 
> 
> 
> Hi all,
> 
> Section 3 of RFC 3032 discusses the procedure for fragmenting the labeled as
> well as unlabeled MPLS packet. In IP there are fields in the datagram header
> (IDENTIFICATION, FLAGS, and FRAGMENT OFFSET) which control fragmentation and
> reassembely of datagrams. But in MPLS header there are no such fields defined.
> So how does reassembly of the fragmented MPLS packets happens at the destination
> host.
> 
> Thanks in advance
> Mohit

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