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RE: RSVP LSP without CSPF?

From: Beatty Lane-Davis <bldavis@hyperchip.com>
Date: Mon, 28 Jul 2003 07:49:37 -0400
Cc: mpls-ops@mplsrc.com
Resent-Date: Mon, 28 Jul 2003 08:15:32 -0400
To: "'Stephen Mullaney'" <stephen.mullaney@parc-technologies.com>, "'Lars Higham'" <lhigham@yahoo.com>, "'Terry Lee'" <terrylee@huawei.com>, carlos@carlos.net, richard.james@rogers.com

Title: RE: [MPLS-OPS]: RSVP LSP without CSPF?

To be very clear the hidden verbatim path-option keyword allows one to avoid a cspf call in IOS.
2 minutes of labwork made short work of this little mystery. If one uses the verbatim keyword neither TE extensions nor friends named TED are required to signal a tunnel:

Lab2R1#sho mpls tra tun br
Signalling Summary:
    LSP Tunnels Process:            running
    RSVP Process:                   running
    Forwarding:                     enabled
    Periodic reoptimization:        every 3600 seconds, next in 2691 seconds
TUNNEL NAME                      DESTINATION      UP IF     DOWN IF   STATE/PROT
Lab2R1_t0                        200.200.200.12   -         Fa0/0.68 up/up
Displayed 1 (of 1) heads, 0 (of 0) midpoints, 0 (of 0) tails
Lab2R1#sho mpls tra tun

Name: Lab2R1_t0 (Tunnel0) Destination: 200.200.200.12
Status:
Admin: up Oper: up Path: valid Signalling: connected

path option 1, type explicit cspf (Basis for Setup, path weight 0)

Config Parameters:
Bandwidth: 0 kbps Priority: 7 7 Affinity: 0x0/0xFFFF
AutoRoute: disabled LockDown: disabled Loadshare: 0 bw-based

InLabel : -
OutLabel : FastEthernet0/0.68, 16
RSVP Signalling Info:
       Src 200.200.200.3, Dst 200.200.200.12, Tun_Id 0, Tun_Instance 3
    RSVP Path Info:
      My Address: 200.200.200.3
      Explicit Route: 192.168.68.10 192.168.69.12 200.200.200.12
      Record   Route: NONE
      Tspec: ave rate=0 kbits, burst=8000 bytes, peak rate=0 kbits
    RSVP Resv Info:
      Record   Route: NONE
      Fspec: ave rate=0 kbits, burst=8000 bytes, peak rate=0 kbits
History:
    Current LSP:
      Uptime: 35 seconds
Lab2R1#sho ip exp
Lab2R1#sho ip explicit-paths
PATH cspf (strict source route, path complete, generation 5)
    1: next-address 192.168.68.10
    2: next-address 192.168.69.12
    3: next-address 200.200.200.12
Lab2R1#sho run in tu 0
Building configuration...

Current configuration : 182 bytes
!
interface Tunnel0
ip unnumbered Loopback0
tunnel destination 200.200.200.12
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng path-option 1 explicit name cspf verbatim
end

Lab2R1#

Lab2R1#sho run | begin router ospf
router ospf 1
log-adjacency-changes
network 192.168.68.1 0.0.0.0 area 0
network 200.200.200.1 0.0.0.0 area 0

-----Original Message-----
From: Stephen Mullaney [mailto:stephen.mullaney@parc-technologies.com]
Sent: Monday, July 28, 2003 6:38 AM
To: Stephen Mullaney; 'Lars Higham'; 'Terry Lee'; carlos@carlos.net;
richard.james@rogers.com
Cc: mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?

Tried an experimet - at least in the inter-area case if you build an
explicit path (no CSPF) it all goes belly up with a PCALC error of
destination not found (dest is in IGP). Put in a loose-hop to the ABR and
it works. So the TED is sanity checked in the strict explicit-path case (at
least on my cisco routers).

-----Original Message-----
From: Stephen Mullaney [mailto:stephen.mullaney@parc-technologies.com]
Sent: 28 July 2003 11:15
To: 'Lars Higham'; 'Terry Lee'; carlos@carlos.net;
richard.james@rogers.com
Cc: mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?

The way I understand it (and I could be wrong) is that even for an explicit
path (no CSPF) the TED is still "sanity checked" to see if the nodes are in
it. But regarding the specifics of "what and how", I am not clear on.

But I am seeing a little hole in my argument - time to experiment ;-)

-----Original Message-----
From: Lars Higham [mailto:lhigham@yahoo.com]
Sent: 28 July 2003 10:54
To: 'Stephen Mullaney'; 'Terry Lee'; carlos@carlos.net;
richard.james@rogers.com
Cc: mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?

What's going to query the TED if you're not using CSPF?

-----Original Message-----
From: Stephen Mullaney [mailto:stephen.mullaney@parc-technologies.com]
Sent: Monday, July 28, 2003 2:22 PM
To: 'Terry Lee'; 'Lars Higham'; carlos@carlos.net;
richard.james@rogers.com
Cc: mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?

You still the the TED for Cisco to check the destination information. I
think the verbatim command will tell it not to check the database. But
if you don't use that option then CSPF or no CSPF, the TED will need to
be present.

Using explicit paths allows you to use offline calculations to define
the path without the need for on-board CSPF.

-----Original Message-----
From: Terry Lee [mailto:terrylee@huawei.com]
Sent: 28 July 2003 05:47
To: 'Lars Higham'; carlos@carlos.net; richard.james@rogers.com
Cc: mpls-ops@mplsrc.com
Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?

which version does cisco support it ?
why cisco router as an ingress doesn't send path message ?

Thanks and Regards,
Terry Lee

> -----Original Message-----
> From: Lars Higham [mailto:lhigham@yahoo.com]
> Sent: Monday, July 28, 2003 12:27 PM
> To: 'Terry Lee'; carlos@carlos.net; richard.james@rogers.com
> Cc: mpls-ops@mplsrc.com
> Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?
>
>
> You are correct - no CSPF, no TED requirement -
>
> Regards,
> Lars
>
> -----Original Message-----
> From: Terry Lee [mailto:terrylee@huawei.com]
> Sent: Monday, July 28, 2003 6:44 AM
> To: carlos@carlos.net; richard.james@rogers.com
> Cc: mpls-ops@mplsrc.com
> Subject: RE: [MPLS-OPS]: RSVP LSP without CSPF?
>
>
> Hi
> If it works without cspf, I think ospt-te isn't needed in
> this case. am I right?
>
>
>
>
> Thanks and Regards,
> Terry Lee
>
> > -----Original Message-----
> > From: carlos@carlos.net [mailto:carlos@carlos.net]
> > Sent: Saturday, July 26, 2003 8:58 AM
> > To: richard.james@rogers.com
> > Cc: mpls-ops@mplsrc.com
> > Subject: Re: [MPLS-OPS]: RSVP LSP without CSPF?
> >
> >
> > On Fri, 25 Jul 2003 17:22:20 -0400, richard.james@rogers.com wrote:
> >
> > cisco has an option "verbatim" , juniper and others
> > support it with "no-cspf"
> >
> > thx
> >
> > carlos
> >
> > >
> > > Hi,
> > > Is it possible to configure an RSVP tunnel with IOS so that it
> > > doesn't run CSPF, but only uses the strict/loose path? This is
> > > when you want to ignore bandwidth and color constraints and only
> > > use the ERO
> > to
> > > compute the path.
> > >
> > > I haven't been able to find an option for this in the docs, but if

> > > it's there I'd appreciate if someone
> > could
> > > point me to the command name.
> > >
> > > Thanks,
> > > Richard
> > >
> > > 1
> > >
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