Subject: RE: TTL for the bottom VC label

From: "Busschbach, Peter B (Peter)" <[email-masked]>
Date: Wed, 2 Jul 2003 17:55:29 -0400

Hariom,
 
The TTL value of the VC (PW) Label was discussed on the mailing list in the first half of May (see archive). The conclusion was:
 
"The setting of the TTL value in the PW label is application dependent, however in a strict point to point application the TTL should be appropriately set to 2"
 
As you see, the text leaves open the possibility that PWs are spliced together to form connections across multiple hops. In that case, the intermediate hops would switch based on the PW label (and decrease the PW Label's TTL value in the process)
 
Peter

-----Original Message-----
From: Hariom Prasad [mailto:[email-masked]]
Sent: Wednesday, July 02, 2003 5:11 PM
To: [email-masked]
Cc: [email-masked]
Subject: TTL for the bottom VC label

All,
 
Generally on the ingress edge hop ( for vpn cases ) 2 labels get pushed, upper tunnel/lsp label and the bottom VC label. The TTL for the upper label should be adequate enough for the hop-count of tunnel/lsp. What should be the TTL value of bottom label..
 
One possibility is to set it to a value same as the top label..Other possibility is to set it to "1" which ensures that VC does'nt travel more than one hop after it is exposed..
 
I would really appreciate if someone could point out what is recommended value if there is one... Thanks
 
with regards,
homp

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