Re: OSPF and ISIS in MPLS CORE ?

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
> > >
> > > _______________________________________________________________________
> > > Subscription information may be found at:
> > > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
> >
> >
> >
> >
> >
> >
> >
> >
>
>
> --
> Bryan Bartik
> CCIE #23707 (R&S), CCNP
> Sr. Support Engineer - IPexpert, Inc.
> URL: http://www.IPexpert.com
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Thu Jul 09 2009 - 21:37:44 ART