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

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
>> >
>> >
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>
>
> --
> Shiran Guez
> MCSE CCNP NCE1 JNCIA-ENT JNCIS-ENT JNCIP-ENT CCIE #20572
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Received on Fri Feb 08 2013 - 21:37:11 ART