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doubt in RFC 3031

  • From: "Bhupesh Bajaj" <mpls@indiatimes.com>
  • Date: Mon, 30 Apr 2001 15:42:10 +0530
  • CC: <mpls-ops@mplsrc.com>
  • X-URL: http://indiatimes.com

hi all.
while going thru RFC 3031 , in Page 18 , second paragraph says...

" This technique allows the egress to do a single lookup, and also requires only a single lookup by the penultimate node "


isnt the penultimate node going to do a single lookup anyway...? or i have got it all wrong..?

according to what i perceived...the penultimate node is going to look into the label which it received and then sends the packet to the next hop according to the information in the label it received with packet...which means ...single lookup....

when would it do a second lookup..?

is it referring to the second lookup that the penultimate node will have to do when it wouldnt find the label in the stack which it is expecting ...and it will go for network layer information...?

kindly let me know.
thanks and regards,

bhupesh.
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