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what is upstream and downstream router in MPLS?


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#1 MPLSVPN

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Posted 23 June 2010 - 06:20 PM

http://www.mplsvpn.info/2010/06/what-is-downstream-and-upstream-router.html

regards
Shivlu Jain

#2 dimplekhan

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Posted 30 August 2010 - 05:10 AM

upstream router is always towards the source while the downstream router is towards the destination.

here is an example to easy understand:

topology:

          (R1)--------(ISP)--------(R2)
         10.10.1.0                20.20.1.0

when the packet generated from 10.10.1.0 subnet the upstream router is R1, while the downstream router is R2.

when the packet generated from 20.20.1.0 subnet the upstream router is R2, while the downstream router is R1.


thanks,

#3 CompJunkie

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Posted 10 September 2010 - 11:33 AM

Great Explanation very good analogy...  :nw:

"Just because something doesn’t do what you planned it to do doesn’t mean it’s useless"


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#4 CompJunkie

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Posted 10 September 2010 - 07:07 PM

I found  this article along the way  Appendix A: DOCSIS and CMTS Architectural Overview
http://www.cisco.com/en/US/docs/cable/cmts/ubr10012/configuration/guide/u10k_a.html

"Just because something doesn’t do what you planned it to do doesn’t mean it’s useless"


A+/Core 220-601 & Tech OS 220-602 - 2002| Security+ SY0-201 - 2009| Network+ N10-003 - 2009| CNST - 2009| MCP-70-291 - 2010 | MCSA-2003 70-290 / 70-270|

MCTS-2008 70-648 | MCITP-2008 70-646 | CCNA 640-802 - 2012 | MCSA-2012 70-417 - 2014 | MCSE 70-416 - 2014 | 70-415 - 2014 | ITIL Foundation - 2016 |  CISSP Pending

#5 rvbhaskar83

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Posted 07 August 2011 - 06:02 PM

Stream ...or RIVER....both hold the same meaning...

In Data networks ,

Downstream meaning  => Towards a network.
Upstream meaning => Away from a network.

Now,

w.r.t a DATA river  (Packets,PING etc...),

  • Source Network is upstream.(For eg : from here a PING is sourced )
  • Destination network is downstream.(This is the destination for the PING )

w.r.t Advertisements river  (RIP/EIGRP/OSPF/BGP advertisements, MPLS LABELS etc.....),

  • Destination network is upstream.(For eg: From here OSPF advertisements are sourced - hence this is UPSTREAM)
  • Source network is down stream.(For eg : This is where OSPF Advertisements finally reach - hence DOWNSTREAM )

The word "SOURCE" and "DESTINATION" are used w.r.t the DATA TRAFFIC - NOT Advertisements.

Why ?  :confused:
Everyone is paying for data traffic , and hence every explanation is made w.r.t data traffic.

The entire concept is built aroud the fact that - Advertisements and Data travel in opposite direction .



Take a paper and pencil ...Draw the above ....you will understand..... :1boss

Edited by rvbhaskar83, 07 August 2011 - 07:10 PM.


#6 rvbhaskar83

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Posted 07 August 2011 - 07:05 PM

View Postdimplekhan, on 30 August 2010 - 05:10 AM, said:

upstream router is always towards the source while the downstream router is towards the destination.

here is an example to easy understand:

topology:

          (R1)--------(ISP)--------(R2)
         10.10.1.0                20.20.1.0

when the packet generated from 10.10.1.0 subnet the upstream router is R1, while the downstream router is R2.

when the packet generated from 20.20.1.0 subnet the upstream router is R2, while the downstream router is R1.


thanks,

You are 100 % correct.
But your description is subjected to the data packets alone.
An explanation w.r.t advertsements would be entertaining.......... :)




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