MPLS and upstream and downstream

Answered Question
Mar 13th, 2007

http://www.cisco.com/warp/public/105/mpls_faq_4649.shtml#qa6

Referring to the question below from the link above :

<quote>

Q. Is R3 a "Downstream" LSR to R4 for 10.1.1.0/24?

A. No, data flows from upstream to downstream.

</quote>

When I read the answer above, I felt there is a typo (any comment) , since the traffic flows from R4 through R3 to reach its final destination 10.1.1.0/24 , hence R3 downstream router to R4, because data flows from upstream (R4) to downstream (R3) to reach its network destination (10.1.1.0/24).

Any insight ?

Regards

I have this problem too.
0 votes
Correct Answer by Harold Ritter about 9 years 9 months ago

Please read this statement that precedes the question:

"The R4 routing table has R1 and R2 as the "next-hops" to reach 10.1.1.0/24."

As you see, R3 is therefore not consider a downstream router.

Hope this helps,

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 5 (1 ratings)
Loading.
Correct Answer
Harold Ritter Tue, 03/13/2007 - 15:12

Please read this statement that precedes the question:

"The R4 routing table has R1 and R2 as the "next-hops" to reach 10.1.1.0/24."

As you see, R3 is therefore not consider a downstream router.

Hope this helps,

Actions

This Discussion