[alcatel-nsp] Bandwidth calculation for Bypass Tunnels in Many-to-one FRR

[Phil Bedard]

FRR is defined on the LSPs on Juniper routers as well, but they allow  
some extra tweaking on the interfaces being protected.  ALU does  
support both facility and one-to-one backup.  Neither method reserves  
bandwidth for the bypass tunnels.  There is a command to reserve  
bandwidth under the FRR config portion of the LSP, but it doesn't do  
anything.  In the 7.0 release it simply says "This command is not  
supported in this release".

One would expect the facility bypass bandwidth configuration to be  
located under the interface configuration, but ALU has yet to  
implement bandwidth protection for bypass tunnels.

Phil


On Apr 13, 2009, at 1:25 PM, Sherry Iwamura wrote:

> Dear All,
>
> I am evaluating the FRR support that will make use of many-to-one  
> bypass tunnels on 7750SR devices. It seems on 7750SR, FRR is  
> configurable only on the LSPs. This is different from Cisco and  
> Juniper, where the bypasses are defined on the PLR.
>
> Does anyone know how we can configure the bandwidth to signal for a  
> bypass tunnel? Since the only place bandwidth can be configured is  
> on the LSP, I would expect the bandwidth configured on the LSP is  
> related to the bandwidth signalled by the bypass.
>
> However, since this is many-to-one (facilities) FRR, a bypass tunnel  
> can be used to protect multiple LSPs. If there are two (or more)  
> LSPs, each has its own bandwidth specified in the many-to-one FRR  
> configuration, how much BW will the bypass tunnel signalled to  
> protect the link that is shared by path of the two LSPs? (I expect  
> only one bypass will be created, let me know if this is not the case  
> for Alcatel-Lucent devices) Will it be the sum, the larger, or any  
> other value (like the all remaining reservable BW)?
>
> Thanks a lot for your information.
>
> Best Regards,
>
> Sherry Iwamura
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