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Cell Relay Retreat>MPLS WG Archive>month:2001-Aug> msg00218



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Time to live

  • From: Satish_Amara@3com.com
  • Date: Tue, 21 Aug 2001 12:05:07 -0500
  • cc: c-david.escobar@wcom.com, mpls@UU.NET
  • X-Lotus-FromDomain: 3COM



The ingress router copies the TTL field from IP  header. After that the
intermediate label
switch routers decrement TTL in label field. If TTL is zero packet is dropped.

Satish Amara




Asim.Khan@vf.vodafone.co.uk on 08/21/2001 11:22:28 AM

Sent by:  Asim.Khan@vf.vodafone.co.uk


To:   c-david.escobar@wcom.com
cc:   mpls@UU.NET (Satish Amara/MW/US/3Com)
Subject:  RE: Time to live



It stays the same. The routers only look at the label value not the IP
header. When the packet leaves MPLS domain then the normal operation would
apply.

Asim

-----Original Message-----
From: David Escobar [mailto:c-david.escobar@wcom.com]
Sent: 21 August 2001 17:19
To: mpls@UU.NET
Subject: Time to live


Hi;
What happens to the TTL field in the IP header when a labeled packet goes
through an LSP? Is it decreased at each router or stay the same?