Re: diffrnece b/w Te-metric & LSP metric

thks.. its prety much clear now....
let me do more digging into it

On Fri, Feb 8, 2013 at 10:28 PM, shiran guez <shiranp3_at_gmail.com> wrote:

> LSP is built from one or more Link's(each link have his own TE metric)
> so naturally TE metric will come first.
>
> I will try to demonstrate the diff with an Example:
>
> lest say you have the following topology:
>
>
>
>
> +---------+ +----------+ +--------+ +----------+
> | R1 +-------+ R2 +------+ R3 +-----+ R6 |
> +-------+-+ +----+-----+ +----+---+ +----+-----+
> | | | |
> | | | |
> | +---+-----+ +----+---+ |
> +----------+ R4 +------> R5 +----------+
> +---------+ +--------+
>
> Each connection between each router have its own TE metric lets say
> they are all 10
>
> Now you create 2 LSP's to the same destination
>
> 1. R1 -- R2 -- R3 -- R6
> 2. R1 -- R4 -- R5 -- R3 -- R6
>
> So the first LSP Calculated Metric will be 30 and the second will be
> 40, and now you wish to make the second LSP better or you want to make
> it equal for load sharing, you can by modifying the LSP metric
>
>
> hope that this make it better :-)
>
> Regards,
>
>
>
>
>
> On Fri, Feb 8, 2013 at 6:07 PM, shekhar sharma
> <shekhar.sharma21_at_gmail.com> wrote:
> >
> > thks shiran... ,,, i hve earlier gone thorugh tht link shared by you....
> :)
> >
> > My confusion is " In the process of LSP formation , what is the step by
> step process ,,, first te-metric comes into picture or LSP metric"
> > and " diffrence b/w the two is not yet cleared 2 me "
> >
> > thanks,
> > Shekhar
> >
> > On Fri, Feb 8, 2013 at 8:47 PM, shiran guez <shiranp3_at_gmail.com> wrote:
> >>
> >> te metric is done under the IGP (ISIS or OSPF) see below example
> default metric is 10 when I have modified te metric on one of the
> interfaces (under the ISIS):
> >>
> >> lab_at_j1# set protocols isis interface em0.21 level 2 te-metric 222
> >>
> >> See that under the link below the IGP metric remain 10 and the TE
> metric was modified to 222
> >>
> >> lab_at_j1> show isis database level 2 extensive
> >> IS-IS level 2 link-state database:
> >>
> >> j1.00-00 Sequence: 0xe1a, Checksum: 0xcd59, Lifetime: 1143 secs
> >> IS neighbor: j1.02 Metric: 10
> >> Two-way fragment: j1.02-00, Two-way first fragment: j1.02-00
> >> IS neighbor: j2.02 Metric: 10
> >> Two-way fragment: j2.02-00, Two-way first fragment: j2.02-00
> >> IS neighbor: j4.02 Metric: 10
> >> Two-way fragment: j4.02-00, Two-way first fragment: j4.02-00
> >> IP prefix: 11.21.0.0/24 Metric: 10
> Internal Up
> >> IP prefix: 11.41.0.0/24 Metric: 10
> Internal Up
> >> IP prefix: 11.61.0.0/24 Metric: 10
> Internal Up
> >> IP prefix: 149.1.1.1/32 Metric: 0
> Internal Up
> >> V6 prefix: 2001:11:21::/64 Metric: 10 Internal
> Up
> >> V6 prefix: 2001:11:41::/64 Metric: 10 Internal
> Up
> >> V6 prefix: 2001:11:61::/64 Metric: 10 Internal
> Up
> >> V6 prefix: 2001:149:1::1/128 Metric: 0 Internal
> Up
> >>
> >> Header: LSP ID: j1.00-00, Length: 400 bytes
> >> Allocated length: 1492 bytes, Router ID: 149.1.1.1
> >> Remaining lifetime: 1143 secs, Level: 2, Interface: 0
> >> Estimated free bytes: 935, Actual free bytes: 1092
> >> Aging timer expires in: 1143 secs
> >> Protocols: IP, IPv6
> >>
> >> Packet: LSP ID: j1.00-00, Length: 400 bytes, Lifetime : 1198 secs
> >> Checksum: 0xcd59, Sequence: 0xe1a, Attributes: 0x3 <L1 L2>
> >> NLPID: 0x83, Fixed length: 27 bytes, Version: 1, Sysid length: 0
> bytes
> >> Packet type: 20, Packet version: 1, Max area: 0
> >>
> >> TLVs:
> >> Area address: 49.0001 (3)
> >> Speaks: IP
> >> Speaks: IPV6
> >> IP router id: 149.1.1.1
> >> IP address: 149.1.1.1
> >> Hostname: j1
> >> IS extended neighbor: j2.02, Metric: default 10
> >> IP address: 11.21.0.1
> >> Local interface index: 65, Remote interface index: 0
> >> Traffic engineering metric: 222
> >> Current reservable bandwidth:
> >> Priority 0 : 590Mbps
> >> Priority 1 : 590Mbps
> >> Priority 2 : 570Mbps
> >> Priority 3 : 570Mbps
> >> Priority 4 : 570Mbps
> >> Priority 5 : 570Mbps
> >> Priority 6 : 570Mbps
> >> Priority 7 : 570Mbps
> >> Maximum reservable bandwidth: 1000Mbps
> >> Maximum bandwidth: 1000Mbps
> >> Administrative groups: 0 <none>
> >> ...
> >>
> >>
> >> Now for the LSP there is a very good explanation in juniper doc
> (something rare :-))
> >>
> >>
> http://www.juniper.net/techpubs/en_US/junos11.1/topics/usage-guidelines/mpls-configuring-lsp-metrics.html
> >>
> >> in short the LSP is a path created from 1 or more links and you may
> reuse that path to reach a destination, in case you have multiple LSP's
> that can reach the same destination I you wish to make one of them
> preferred.
> >>
> >>
> >> Hope that helps with your confusion.
> >>
> >>
> >> On Fri, Feb 8, 2013 at 3:07 PM, shekhar sharma <
> shekhar.sharma21_at_gmail.com> wrote:
> >>>
> >>> Correct Brian.
> >>>
> >>> Thanks for your input...
> >>>
> >>> But I am working in junos environment only,,,and In junos Te-metric &
> LSP
> >>> metric are two different things.
> >>>
> >>> My understanding is that,, we will configure te-metric lower then the
> IGP
> >>> cost on every router and configure the IGP metric at the higest value.
> >>> This is done so that traffic should always take MPLS path rather than
> IGP
> >>> path.
> >>>
> >>> Second parameter is LSP metric ,,,which can be configured mannualy or
> >>> dynamic inherted from IGP. best practice is to static configure LSP
> metric
> >>> on each router if you are using RSVP full mesh.This is required to have
> >>> stablity inn the n/w ,,change in IGP will not affect LSP,,,as LSP
> metric is
> >>> staticaly configured.
> >>>
> >>> But I am still confused on how these parameters came into picture in
> LSP
> >>> formation.
> >>>
> >>>
> >>>
> >>> On Fri, Feb 8, 2013 at 5:37 AM, Brian McGahan <bmcgahan_at_ine.com>
> wrote:
> >>>
> >>> > What Cisco calls the TE metric is what I believe Juniper calls the
> LSP
> >>> > metric. The key is that there is an IGP metric for the link and a
> >>> > separately configurable TE metric. If you want to change the TE
> tunnel's
> >>> > cost but not affect IGP you have that option. Normally the TE
> metric is
> >>> > inherited from the IGP metric, but you can manually change it with
> the
> >>> > "mpls traffic-eng administrative-weight" command.
> >>> >
> >>> > See the following:
> >>> >
> >>> >
> http://www.cisco.com/en/US/docs/ios/mpls/configuration/guide/mp_te_cfg_path_calc.html
> >>> >
> >>> >
> >>> >
> http://www.cisco.com/en/US/docs/ios-xml/ios/mpls/command/mp-m4.html#GUID-61EE6705-8B24-44B4-BDA4-720C362F71CF
> >>> >
> >>> >
> >>> > HTH,
> >>> >
> >>> > Brian McGahan, CCIE #8593 (R&S/SP/Security)
> >>> > bmcgahan_at_INE.com
> >>> >
> >>> > Internetwork Expert, Inc.
> >>> > http://www.INE.com
> >>> >
> >>> > -----Original Message-----
> >>> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On
> Behalf Of
> >>> > shekhar sharma
> >>> > Sent: Thursday, February 07, 2013 1:36 PM
> >>> > To: Cisco certification
> >>> > Subject: diffrnece b/w Te-metric & LSP metric
> >>> >
> >>> > Hi All,
> >>> >
> >>> >
> >>> > I have been working on MPLS traffic engineering and concepts like
> >>> > forwarding adjaency these days.
> >>> >
> >>> > I am confused on the diffrence b/w Te-metric & LSP metric and
> >>> > how,when,where to manipulate them.
> >>> >
> >>> > If anyone can share some docs or links that will be helpful.or if can
> >>> > explain to me
> >>> >
> >>> > thanks,
> >>> > Shekhar
> >>> >
> >>> >
> >>> > Blogs and organic groups at http://www.ccie.net
> >>> >
> >>> >
> _______________________________________________________________________
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> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>
> >>
> >>
> >> --
> >> Shiran Guez
> >> MCSE CCNP NCE1 JNCIA-ENT JNCIS-ENT JNCIP-ENT CCIE #20572
> >> http://cciep3.blogspot.com
> >> http://www.linkedin.com/in/cciep3
> >> http://twitter.com/cciep3
> >
> >
>
>
>
> --
> Shiran Guez
> MCSE CCNP NCE1 JNCIA-ENT JNCIS-ENT JNCIP-ENT CCIE #20572
> http://cciep3.blogspot.com
> http://www.linkedin.com/in/cciep3
> http://twitter.com/cciep3

Blogs and organic groups at http://www.ccie.net
Received on Sat Feb 09 2013 - 18:39:38 ART