The MPLS WG Archive

[Ping Pan <pingpan@juniper.net>]

Sachin:


On Fri, 28 Dec 2001, Sachin Kalra wrote:

> Hi All:
>
> I have few questions regarding Fast Reroute using Bypass tunnels using
> RSVP-TE. Any help is appreciated.
>
> Consider the following network, where 10 different LSPs are
> traversing  [R1]-->[R2]-->[R3]-->[R4]-->[R5], another one LSP traversing
> [R1]-->[R2]-->[R10], And there is a Bypass Tunnel configured
> from  [R2]==>[R6]==>[R7]==>[R8]==>[R4]
>
>
>        [R0]            [R10]
>              \          /
>                \      /
> [R1]---------[R2]--------X----------[R3]----------------[R4]-----------------[R5]
>
>                    \\                                          //   \
>                     \\                                        //      \
>                      [R6]======[R7]======[R8]         [R9]
>
>
> Now my questions are:
> 1. Does the Bypass Tunnel protects all 10 LSPs or we can associate just
> some of them to the Tunnel?
>

You can associate the LSPs to the bypass LSP base on the config at R2, and
the information carried in the protected LSPs. For example, when R2 is set
to backup any LSP that has the reroute-desired bit set in SAO, if all 10
LSPs have such bit on, they will be backed up via the bypass tunnel.

> 2. How to disassociate LSP [R1]-->[R2]-->[R10] from the bypass tunnel?
>

Again, base on your config at R2.

> 3. How does [R2] makes its NHLFEs for the Bypass Tunnel?
>
> 4. What FEC does [R2] use to inject traffic into the bypass tunnel at time
> of failure? Or how does [R2] associate any traffic with the Bypass Tunnel?
>
> I would appreciate answer to all or any of the above questions.
>
> Thanks,
> Sachin Kalra
>
>