Re: RSVP and Multi Area OSPF Problem

Hi adam

How LDPoRSVP solves Inter Area TE problem. Is there any use case for it ?
 Any case studies u know ? can u share it ?

On Mon, Oct 22, 2012 at 8:05 PM, Adam Booth <adam.booth_at_gmail.com> wrote:

> Typically RSVP-TE will only operate in a single area but there has been
> work on multi-area traffic engineering -
> http://www.cisco.com/en/US/tech/tk436/tk832/tech_brief09186a00801f0b2d.html
>
> There are a couple of other ways I know of that can enable a service to
> span multiple areas (RSVP-TE is still contained within each OSPF/ISIS area
> though)
>
> 1) You can investigate the use of LDPoRSVP tunnels to see if that resolves
> your problem - I couldn't find anything quickly for IOS but have done this
> with other platforms (Junos and SROS)
>
> 2) Multi-segment pseudowires, the ABR (S-PE) in this case would provide a
> stitching function between two PWs -
> http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/multisegmentpseudowires.html#wp1054881
>
> Cheers,
> Adam
>
>
> On Tue, Oct 23, 2012 at 12:09 AM, Routing Freak <routingfreak_at_gmail.com>wrote:
>
>> Hi
>>
>> I have a large Core network with RSVP running for the LSP setup. But i
>> have
>> two different OSPF areas for RSVP. THis is my setup
>>
>> R1---------R2--------R3-------R4------------R5
>>
>>
>> R1,R2 and R3 are running OSPF area 0 and R3,R4 and R5 are running area 1 .
>> So in this case R3 is my ABR and i am running RSVP on all the routers .
>>
>> I have to form a LSP from R1 to R5 . But CSPF runs only within a area and
>> so the CSPF information will not be passed between areas ( Correct me if i
>> am wrong )
>>
>> So how does R1 calculates the path dynamically. Is there any way to do
>> it. ?
>>
>> I have seen some methods such as Loose and Strict Next hops used in
>> certain
>> scenarios but i cant really get the point of loose and strict next hops.
>>
>> What is exactly strict and loose next hops and how many labels it i
>> carries
>> and how it works.
>>
>> Has someone in the group tried this scenario.
>>
>>
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Received on Mon Oct 22 2012 - 20:20:59 ART