The MPLS-OPS Archive

["Aries C" <cariesc@hotmail.com>]

Hi All,

I have few questions, but fall under few areas in VPN, TE, COS, etc. So, I 
can't put a proper subject, obviously ;-). The reason is, I am kind of lost 
with the books I am reading. 2 books I have been reading have been guiding 
me quite well, but there're still important area not covered well, or not at 
all covered (Inter-AS, 2547bis, CoS, etc.) Additionally, the more I read, 
the more I have questions :-(

Here's a case of my brainstorming, which I could generate all the questions 
from :

Assuming I have 1 subnet behind a CE1 and connected to a subinterface of FE 
(existing live traffic in it, but simply create another subinterface) and 
associate it to a VRF (RD=100:27, RT=100:27) in PE1. On the other VPN end, I 
have 2 (a/24, b/24, and c/24) subnets connected with 2 FR PVCs  into 2 
different serial subinterfaces  and associate it to VRF2 (also RD=100:27 and 
RT=100:27, assuming no extranet and keep it as fully-meshed, so I can use 
the same RD for both site, simple route target) at PE2 (for 2 different 
types of traffic, i.e. voice and non-voice)

Questions :

1. Is the LSP created after the 2 VRFs have VPNv4 routing adjacency ?
2. With 1 subnet behind CE1, and 2 subnet behind CE2, how many LSP will be 
established between this 2 PEs for related VRFs?
3. What options do I have for label distibution and signaling, if what I 
need are COS (bandwidth and TOS/diffserv mapping to MPLS experiment bits) 
and TE (explicit hop-by-hop LSP, rather than IGP) ? I notice the books I 
read only mention LDP/TDP, but other vendor typically write LDP or RSVP.
4. Why other type of TE seems not popular (i.e. OSPF TE, etc.)? In Cisco 
books I have, they don't even mention about RSVP TE.
5. What's the recommended mapping from TOS --> MPLS exp. bits and diffserv 
--> MPLS exp. bits ? I am sure, with 3 bits, the mapping is quite common 
across most of the MPLS networks providers.
6. For 2 applications, voice and non-voice, will COS requirement affect the 
number LSP needed ? Is it relevant questions?
7. Based on your experience with some different vendors, will turning on 
LDP/RSVP at FE subinterfaces (both at egress PE1 and ingress P) causes 
disruption on the live traffic at the interface, which has been running 
without sub-interfaces ?
8. How PE identify my CE traffic is for MPLS or not ? simply through 
interface it receives it from, and see to which VRF it's associated with ?
9. What's the best way to provide QoS at PE1-to-CE1 ? The other end has no 
issue with PVCs, but PE1-to-CE1 is using Fast Ethernet subinterface only.
10. What determine the label deep? Means, if I have my own network PE-to-Pe, 
including several P routers,  could I use ony 1 level label, instead of more 
? Because, as I own the P and PE routers, I don't need to hide the first 
label by stacking another one. I could use one label and keep switching it 
to the engress PE, could I not ?


11. Last question, not related to the above case, if SP1 using RFC 2547 in 
its network,  and the other one is using 2547bis, how could I have Inter-AS 
MPLS between them ? If I am not wrong, Inter-AS is only defined in 2547bis. 
So, I was wondering between two of them if they want to do so...


Well, a lot of questions, took me 1 hours to collect all the questions. 
Please bear with me if it's a bit too much for the list. But I hope to learn 
from this great forum.


TIA


Aries C.

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