The MPLS-OPS Archive

[Rajiv Asati <rajiva@cisco.com>]

At 03:01 PM 5/19/2002, C. J. Koch wrote:
>Hello,
>
>I have a question which I hope you can help me with.
>I wasn't able to find an answer on the faq.

Would you please let us know the FAQ URL ?


>I read the following in an article:
>
>Cell-switched MPLS uses downstream-on-demand and
>conservative label-retention.
>Frame-switched MPLS uses unsolicited-downstream and
>liberal-retention.
>
>Why is there this difference ?

In cell-mode, the labels are nothing but PVCs, which can be quite limited 
(depending upon the platform). Hence, downstream-on-demand and conservative 
label-retention are required to use this limited PVC space appropriately.
Whereas, frame-mode doesn't have such limitation since frame-mode uses 
4-byte field for labels.

Hope that helps.

Raj


>Thanks a lot for any help you can give
>Cheers Chris
>
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