RE: IGPs and LMP's TE-link

[Zafar Ali <zali@cisco.com>]

At 09:33 AM 5/23/2002 +0300, Liran Siglat wrote:
> Hi,
>  
> I'll try to clarify the
> question with an example:
>  
> We have 4 data-links
> a,b,c,d. 
> We define 2 TE-links:
> TEL1 containing a&b, TEL2 containing
> c&d.
> Which components may the
> UNI use? for which purposes?
> Which components may the
> IGP use? for which purposes?
> Which components may the
> TE engine use for CSPF? for which purposes?
> Which 'logical'
> interfaces will the local UNI-C have towards the remote UNI-C? a,b,c
> &d or TEL1 & TEL2?
>  
> Thanks,
> Liran.

Hi Liran, 

Unless I miss-understood your question again, the answer to your question
depends on how the users would like to configure the TE link TEL1 and
TEL2, i.e., with UNI 1.0 or G-MPLS. The only restriction would be that
all component links of a TE link belong to the same application the TE
link is configured with. Also, CSPF works at the TE link level. 

Thanks

Regards... Zafar

-----Original Message-----

From: Zafar Ali [mailto:zali@cisco.com]

Sent: Wednesday, May 22, 2002 8:40 PM

To: Liran Siglat; ccamp@ops.ietf.org

Subject: Re: IGPs and LMP's TE-link

Dear Liran,

BTW, I've found your questions rather confusing. Any way, the following are the related comments,

• There is no difference (as such) between the way a TE link is represented by LMP and within IGP (with the exception of the level of details each protocol is concerned with).
• There is no direct relation between UNI 1.0 and IGP. However, once UNI connection(s) is (are) established, one may run IGPs on that (these) connections (either in a bundled or unbundled configuration). But this case does not require any standard specification.
• Multiple component links between UNI-C and UNI-N can be regarded as TE links without an IGP adjacency. But one can run LMP on such TE Links.

Hope this helps.

Thanks

Regards... Zafar 

At 08:06 PM 5/22/2002 +0300, Liran Siglat wrote:

Hi,

I have a question regarding the way LMP's TE-link is observed by IGPs.

In case a connection was established between 2 UNI-Cs over a TE-link (aggregating multiple data-bearing links), does an IGP running on the UNI-C see the TE-link as a new interface (with the capacity of all the data-links) or does it see multiple interfaces (each one corresponds to a data-link) ?

===============================================
Zafar Ali
Cisco Systems
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email: zali@cisco.com