Fwd: Re: SE style in optical neyworks

[Suresh Katukam <skatukam@cisco.com>]

>
>Tom and all,
>
>I think everyone seemed to pick on my terminology or misinterpreted
>what I said.
>
>Here is an example:
>
>          1+1                        1+1
>A ----------------B --------- C ------------D
>                      \          /
>                        \       /
>                           E
>
>
>A - B & C - D 1+1 line protected
>B - C, C - E, B - E are all unprotected links.
>
>Say, one wants to create a protected LSP from A to D.
>then, you would create one primary LSP from A to D via
>A - B - C - D, and then you would create another LSP
>from A to D using SE style ( to indicate that this is an
>alternate path for same Tunnel ) via A - B - E - C - D.
>This way B - C is protected by B - E - C.
>
>B - C - E is not configured as a UPSR. All unprotected links.
>Virtual UPSR can be created such a way that B has a bridge
>and C has a selector. Ofcourse, for bidirectional LSP, you need
>the same thing in the opposite direction too.
>
>Now, what do you call this kind of protection? Protected LSP?
>But not 1+1 path protected  - since it is not end-to-end path
>protected.
>
>To clarify again, this is when you would use SE style.
>
>Thanks
>Suresh
>
>
>At 01:17 PM 4/12/2002 -0400, Thomas D. Nadeau wrote:
>
>
>>>This can be used to set up Protected circuits which may contain
>>>1+1 lines and 1+1 path protected segments. So on 1+1 line
>>>protected segments, you Share the bandwidth among primary
>>>and alternate paths.
>>
>>         You do not share the bandwidth across 1+1 circuits. You
>>double-book the bandwidth because the same packets are
>>sent twice: once over each LSP.  You only share bandwidth
>>with 1:N.
>>
>>         --Tom
>>
>>
>>>Setting up protected circuits is not considered
>>>in detail so far. Hopefully, P&R design team will consider this..
>>>
>>>Thanks,
>>>Suresh
>>>
>>>At 04:32 PM 4/12/2002 +0530, Khuzema Pithewan wrote:
>>>>Hi,
>>>>
>>>>How does SE style of RSVP signalling fits in the optical nature of network
>>>>i.e. in wavelength, TDM switching etc.
>>>>
>>>>  In other words, How two lsp can share resource in optical networks??
>>>>
>>>>Regards,
>>>>Khuzema.
>>
>>
>>
>>------------------------------------------------------------------------
>>Mathematics is the supreme nostalgia of our time.