The MPLS-OPS Archive

[Epi Salamanca <epi@nmg.upc.es>]

Hello Eric,

so if I understood well in  MPLS network RSVP-TE is only used as a way to
carry (TE) information about unnumbered links in IGP TE extensions and to
specify unnumbered links in MPLS TE signalling, isn't it?

So, is not possible to enforce a specific QoS using RSVP, isn't it?
To do that we should use Diffserv, isn't it?


I've the following testbed:

A==[CE_1] ===[PE_1] ====[P]====[PE_2]===[CE_2]==B

Where [PE_1]==[P]===[PE_2] are MPLS aware, and belongs to the same ospf 
area.
I've setup 2 MPLS TE tunnels :

    o- [PE_1] ---> [PE_2]
    o- [PE_2] ---> [PE_1]

and all the traffic that goes from A to B and to B to A is forwardded 
through  the tunnels. I've allocated a particular amount
of bandwidth for the tunnels.
Everything goes well until I introduce an inteferent traffic (UDP 
traffic), under this situation (the link is congestioned) the good
traffic (A<-->B) is affected by the interferent traffic, in fact the 
interferent traffic is better treated by the routers.
In all the interfaces I'm using fair-queueing. ( I guess that's the 
reason why the interferent traffic is better treated - low bit rate - 
low packet size- several flows)

Under these situation, if I understood well to Eric, I should setup 
diffserv to guarantee a specific sla, isn't it?


Thanks in advance,

Cheers,
Epifanio Salamanca



Supporting MPLS TE over unnumbered links (i.e., links that do not
   have IP addresses) involves two components: (a) the ability to carry
   (TE) information about unnumbered links in IGP TE extensions (ISIS or
   OSPF), and (b) the ability to specify unnumbered links in MPLS TE
   signalling.  The former is covered in [GMPLS-ISIS, GMPLS-OSPF].  The
   focus of this document is on the latter.









Eric Osborne wrote:

>On Thu, Mar 20, 2003 at 10:00:43AM +0800, Tommy wrote:
>  
>
>>Hello,
>>I have some questions which I want to make sure.
>>
>>1.How to find congestion in MPLS based on ISIS-TE network?
>> 
>>    
>>
>
>look for interface drops, queue backups, etc.
>
>  
>
>>2.How to realize Qos in MPLS network?
>>
>>    
>>
>
>diffserv, same as in IP.
>
>  
>
>>3.What's the functino of RSVP in MPLS network?
>>
>>    
>>
>
>rfc3209.
>
>  
>
>>4.Does CSPF calculation uesd the information of TLV and sub-TLV of ISIS-TE protocol?
>>
>>    
>>
>
>yes.
>
>  
>
>>5.How to get the sub-TLV in ISIS-TE and their functions?
>>
>>    
>>
>
>draft-ietf-isis-traffic-04.txt
>
>  
>
>>Any help in this regard will be appreciated!
>>
>>    
>>
>
>see also
>http://www.ciscopress.com/catalog/product.asp?product_id={B9972E73-2D87-47E3-BCDA-6A5334233561}
>
>
>
>
>eric
>
>  
>
>>Thanks and Regards.
>>
>> Tommy Chen
>>
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>>
>
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| Epifanio Salamanca Cuadrado                         |
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| email: epi@nmg.upc.es                               |	
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