Re: OSPF and ISIS in MPLS CORE ?

OSPF uses Constraint based-SPF which takes constraints like bandwidth
reservation, available bandwidth in to account while calculating shortest
path.This all for just implementing MPLS Traffic Engineering
Regards
Nadeem
On Fri, Jul 10, 2009 at 12:28 PM, jack daniels <jckdaniels12_at_gmail.com>wrote:

> Hi,
>
> Thats great to hear , but out of curosity I want to know what basis you
> decided to go for ISIS over any other protocol ( ospf).
>
> Regards
> J.Daniels
>
> On Fri, Jul 10, 2009 at 11:07 AM, darth router <darklordrouter_at_gmail.com
> >wrote:
>
> > IS-IS rocks! You can tune the shit out of it, it's light weight, fast,
> > adjacencies processes are simple, you can run everything in the same
> area.
> >
> > I LOVE how you can peer into the PDU/LSP, and see what routes clns
> > contains and hostname mappings, and you can run IPV6 in the same process.
> >
> > Once you get the hang of it ,and spend a bit of time working to
> understand
> > CLNS concepts, it becomes a very robust protocol option. OSPF is commonly
> > used, lots of 3rd party vendors will support it where they won't IS-IS,
> and
> > most people know OSPF at least to a degree where they can get it working.
> >
> > I looked into using both and came to the conclusion for my needs IS-IS
> was
> > the superior protocol in my ISP core.
> >
> >
> > On Thu, Jul 9, 2009 at 11:33 AM, Bryan Bartik <bbartik_at_ipexpert.com
> >wrote:
> >
> >> FYI, OSPF uses the Opaque LSAs to keep track of things like bandwidth
> >> availability for priorities on interfaces. This is an example from the
> >> command reference for "show ip ospf database."
> >>
> >> Router# show ip ospf database opaque-area adv-router 192.168.1.12
> >>
> >> OSPF Router with id(192.168.1.11) (Process ID 1)
> >>
> >> Type-10 Opaque Link Area Link States (Area 0)
> >>
> >> LS age: 224
> >> Options: (No TOS-capability, DC)
> >> LS Type: Opaque Area Link
> >> Link State ID: 10.0.0.0
> >> Opaque Type: 1
> >> Opaque ID: 0
> >> Advertising Router: 192.168.1.12
> >> LS Seq Number: 80000081
> >> Checksum: 0xF659
> >> Length: 132
> >> Fragment number : 0
> >> MPLS TE router ID : 192.168.1.12
> >> Link connected to Point-to-Point network
> >> Link ID : 192.168.1.11
> >> Interface Address : 172.16.1.12
> >> Neighbor Address : 172.16.1.11
> >> Admin Metric : 10
> >> Maximum bandwidth : 193000
> >> Maximum reservable bandwidth : 125000
> >> Number of Priority : 8
> >> Priority 0 : 125000 Priority 1 : 125000
> >> Priority 2 : 125000 Priority 3 : 125000
> >> Priority 4 : 125000 Priority 5 : 125000
> >> Priority 6 : 125000 Priority 7 : 100000
> >> Affinity Bit : 0x0
> >> Number of Links : 1
> >>
> >>
> >>
> >> On Thu, Jul 9, 2009 at 11:54 AM, Joe Rinehart <jjrinehart_at_hotmail.com
> >> >wrote:
> >>
> >> > I personally loathe ISIS and only know of one SP that uses it for the
> >> MPLS
> >> > core. When I worked for AT&T they used OSPF and you can mock up a lab
> >> that
> >> > mimics that kind of set up...
> >> >
> >> > -----Original Message-----
> >> > From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf
> Of
> >> > srinivas pv
> >> > Sent: Thursday, July 09, 2009 09:39
> >> > To: jack daniels
> >> > Cc: Cisco certification
> >> > Subject: Re: OSPF and ISIS in MPLS CORE ?
> >> >
> >> > Hi,
> >> >
> >> > Yes. you can run EIGRP or any other routing protocol you want.
> >> >
> >> > But most of the Service providers use OSPF/ISIS
> >> >
> >> > Thanks,
> >> > Srinivas
> >> >
> >> > On Thu, Jul 9, 2009 at 9:35 PM, jack daniels <jckdaniels12_at_gmail.com>
> >> > wrote:
> >> >
> >> > > Hi All,
> >> > >
> >> > > We always see SP run in MPLS core OSPF or ISIS only why ?
> >> > >
> >> > > can we run EIGRP or any other protocol also.
> >> > >
> >> > > Thanks and Regards
> >> > >
> >> > >
> >> > > Blogs and organic groups at http://www.ccie.net
> >> > >
> >> > >
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> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >>
> >>
> >> --
> >> Bryan Bartik
> >> CCIE #23707 (R&S), CCNP
> >> Sr. Support Engineer - IPexpert, Inc.
> >> URL: http://www.IPexpert.com <http://www.ipexpert.com/> <
> http://www.ipexpert.com/>
> >>
> >>
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Received on Fri Jul 10 2009 - 15:34:33 ART