The MPLS-OPS Archive

[Dave Stewart <dave_stewart1576@yahoo.co.uk>]

Thank you for your help,

 

Can someone on the list please confirm if they have a running version of cisco IOS which supports both ISIS-TE and OSPF-TE? Are there any issues on the same?

 

Can you please let me know the version and the platform you are using?

 

Also, can someone from cisco please confirm if possible?(I shall be contacting my cisco representative but would really like a confirmation)

 

-Dave

 

"M. ELK" <elkou141061@hotmail.com> wrote:

Pls find the reply inline .

Brgds


>From: Dave Stewart
>To: "M. ELK" , mpls-ops@mplsrc.com
>Subject: Re: [MPLS-OPS]: Cisco, Traffic Engineering for RSVP
>Date: Wed, 23 Jul 2003 19:12:56 +0100 (BST)
>
>
>Some nits I would like to clarify, thank you for the response:
>
>"M. ELK" wrote:
>
>
>Dave
>
>AFAIK ,
>
>Qa. How do cisco routers learn the information on link utilisation?
>Aa. IGP (any link state , IS-IS or OSPF both supported by cisco) flood the
>link utiilization
>as an attribute for link state .
>
>Q. Is this attribute propogated using Opaque LSA?
>
For OSPF : Yes .

>
>RSVP do the accounting , ie: start with certain B.W anmou! nt per
>interface ( % of link speed)
>and decrease the amount of each LSP set up through this interface .
>Of course RSVP and IGP process at the router need to commuicate .
>U could set the frequency of IGP fllooding due to link utilization
>change (normally as % of
>change ) .
>
>Qb. The 12.3 IOS set does not have anything on support for Katz-Yeung or
>Smit-Li drafts.
>Ab. Ufamiliar with those draft .
>
>
>
>Q. What is the method used to propogate the TE information? These are the 2
>drafts I am aware of which come from the OSPF and ISIS WG. Does cisco
>support the same? Can someone please tell me the IOS version this is
>supported from? We need to get the same for our network here.I have been
>following new IOS releases closely to get the same.
>

For IS-IS : draft-ietf-isis-traffic-02.txt
For OSPF : draft-katz-yeung-ospf-traffic-01.tx , as U indicat! ed previously .

Guess TE OSPF/IS_IS is supported long ago by csco , saw 12.0(22)S used for
IS-IS .

>
>Qc. Does this mean all LSP setups are independentof IGP? How does it tell
>RSVP how to setup LSP?
>Ac. IGP populate a TE D.B ,RSVP could use the TE D.B to calculate the path
>of the LSP ie: CSPF ,
>in other word this is an EDUCATED-GUESS .
>RSVP could totally ignore the TE D.B and set LSP with strict or loose
>path , this is when U config
>static path . seting LSP this way is a blind trial which could succeed
>if their is avail B.W on the path
>specified .
>
>Qd. Assuming it is not CSPF either, can RSVP-TE be simply used to set up
>label with constraints? How do routers get information on these
>constraints?
>Ad. LSP should always have a constrain even if constrain is none ie:LSP B.W
>requirement = 0 .
>CSPF help to calculate best path which statisfy the constraint before
>setting the LSP .
>The RSVP could take a completely blind trial simply setting the path as
>{loose Egress} ,now
>every node along the path find the best path to the egress , this
>appropriate if U set the
>LSP contarin as zero .
>U could set the full path still set the constarin as zero ,this is
>mainly if U calculate the TE by
>offline-tool and U need to totally disable the online CSPF of the
>HEAD-END node and any
>RSVP accounting on transit node .
>
>What is the present method to be doing it? Is it the TE tool?
>
>
Guess , the on-line ie: CSPF is simple and ready available .
>
>
>-Dave Stewart
>
>
>
>
>---------------------------------
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