Got it

You know the Label TTL and IP TTL of the MPLS packets sent by the L3 switch SWB to the SWC.

Latest reply: Dec 27, 2018 08:02:41 1535 2 8 0 0

There are TTL fields in the MPLS label packets.


In the network shown in the figure, You know the Label TTL and IP TTL of the MPLS packets sent from the SWB to the SWC.



095112can44izwgn44gwzm.png



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The correct answer is 254 and 10
Because the TTL value remains unchanged after the label is added to the IP packet, only the TTL value of the Label changes.

This post was last edited by 4am at 2018-12-27 01:56.
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user_2915719
Created Dec 27, 2018 07:27:11

Interesting result. But the switches are still IP packets I thought.
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yiyi0519
Created Dec 27, 2018 08:02:41

MPLS is independent of Layer 2 and Layer 3 protocols, such as ATM and IP. It provides a way to map IP addresses to simple fixed-length tags for different packet forwarding and packet switching techniques. It is an interface to existing routing and switching protocols such as IP, ATM, Frame Relay, Resource Reservation Protocol (RSVP), Open Shortest Path First (OSPF), and more.
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