Re: SRLG Shared Risk Link Group with MPLS TE

HI,

I got ur point Adam, One slight doubt is to how two devices can share the
same port. In one slot, there are many ports. So each device occupies a
different port inside the same slot. So i think If the entire slot fails or
else the line card where all these slots are presented fails, then its a
big porblem. Then SRLG makes lot of sense.

One question. In the Line card level, How can u know that this port is
connected to whihc line card. In cisco . is there any command to view it

THank You

On Fri, Dec 9, 2011 at 1:18 PM, Adam Booth <adam.booth_at_gmail.com> wrote:

> Common attributes could include:
>
> Using the same Physical Port or Line Card (a port or card failure is in
> common here)
> paths sharing the fibre physical fibre cable or cable duct (a fibre cut
> has a potentially common failure)
>
> The point is to help give the network some intelligence in helping to
> determine a safe alternate path (so where possible your backup wont die at
> the same time as the primary path)
>
>
> On Fri, Dec 9, 2011 at 3:15 PM, Routing Freak <routingfreak_at_gmail.com>wrote:
>
>> HI Karim,
>>
>> Thank you for the info
>>
>> Shared Risk Link Groups (SRLGs) refer to situations where links in a
>> network share a common fiber (or a common physical attribute). If one link
>> fails, other links in the group may fail too. Links in the group have a
>> shared risk.
>> Can you give me a example which can explain me the above statement ..
>>
>> Wat is exactly called as sharing common physical attributes. Is it they
>> are
>> all part of same physical hardware.
>> I am not getting it exactly?
>>
>> On Thu, Dec 8, 2011 at 8:07 PM, Karim Jamali <karim.jamali_at_gmail.com>
>> wrote:
>>
>> > Hi Routing Freak,
>> >
>> > Simply stated:
>> > You have a primary LSP carrying traffic from point A to point B for a
>> > certain service. You want to provision another LSP as a backup one
>> however
>> > you have to take into consideration the SRLG or fate sharing i.e. if
>> both
>> > these LSPs share common links for instance. Thus when the links go down,
>> > both the primary/backup LSP will break.
>> >
>> > Thus when provisioning backup LSP for node/link protection you have to
>> > take into consideration that the two LSPs don't share the same SRLG.
>> >
>> > HTH,
>> >
>> > Thanks
>> >
>> >
>> > On Thu, Dec 8, 2011 at 9:04 AM, Routing Freak <routingfreak_at_gmail.com
>> >wrote:
>> >
>> >> Hi fellas,
>> >>
>> >> Can anyone share any doc which explains SRLG with MPLS TE. I am reading
>> >> MPLS TE and i found a term called as SRLG . I googled it but havent
>> seen
>> >> any good docs for that. Can anyone share me a good doc for SRLG.
>> >>
>> >> Thank You
>> >>
>> >>
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>> >>
>> >>
>> >
>> >
>> > --
>> > KJ
>> >
>> >
>> >
>> > --
>> > KJ
>>
>>
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Received on Fri Dec 09 2011 - 13:58:40 ART