From: Scott Morris (smorris@ipexpert.com)
Date: Thu Jul 05 2007 - 14:52:15 ART
Well, it's really an interesting scenario (at least the bit of this I've
read through!).
When using the "ip ospf x area y" command, it's a more direct approach than
the "network x.x.x.x" command. The network command will find ANY interfaces
meeting the IP address criteria given and then enable those interfaces in
the process. The "ip ospf area" command on the other hand, will
specifically tag whatever EXACT interface that is used as being part of the
process.
So if you place that command on the loopback, even though another interface
shares the same IP address, it will not enable ospf on that interface.
"show ip ospf interface brief" would be a quick way to check this out.
On the other hand, even though a virtual-template is not an actual
interface, it feeds ALL commands to the virtual-access interfaces that are
created from it. So in that respect, that's how you would enable OSPF over
those links.
Fun stuff to watch though, and certainly the show commands or debugs are the
best way to actually see things happening!
HTH,
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, JNCIE
#153, CISSP, et al.
CCSI/JNCI-M/JNCI-J
VP - Technical Training - IPexpert, Inc.
IPexpert Sr. Technical Instructor
A Cisco Learning Partner - We Accept Learning Credits!
smorris@ipexpert.com
Telephone: +1.810.326.1444
Fax: +1.810.454.0130
http://www.ipexpert.com
PS. If you put ospf on the PPPoFR line, you'll get two LSAs. One for the
P2P link (a /30 or /24 or whatever it is) plus a /32 route OF THE OTHER SIDE
due to the peer neighbor-route exchange that PPP does. So you'll get a stub
host route, just not of your own IP address like putting OSPF on a loopback
interface does by default.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Gary
Duncanson
Sent: Thursday, July 05, 2007 12:54 PM
To: Jason Guy (jguy)
Cc: swm@emanon.com; Eric Dobyns; Narbik Kocharians; ccielab@groupstudy.com
Subject: Re: PPPoFR
Jason,
Is Virtual-Template/Access just a template and not an interface at all? I
have only played with these recently.
I'm going to have to take a look at this one. Put it on the list of stuff to
do.
Gary
----- Original Message -----
From: "Jason Guy (jguy)" <jguy@cisco.com>
To: "Eric Dobyns" <eric_dobyns@yahoo.com>; "Ben" <bmunyao@gmail.com>; "Gary
Duncanson" <gary.duncanson@googlemail.com>
Cc: "Narbik Kocharians" <narbikk@gmail.com>; <ccielab@groupstudy.com>
Sent: Thursday, July 05, 2007 4:08 PM
Subject: RE: PPPoFR
Very cool and it actually makes sense. The Virtual-Template/Access is the
interface participating in OSPF. The ip unnumbered is just indicating the
ip address to use for the interface. So it makes sense to put the interface
ospf command on the interface with the link running OSPF.
The loopback on the other hand is an innocent bystander in the situation.
It is unaware of another interface using its IP address. By applying the
ospf command to a loopback just creates a stub host on the router for the
loopback.
Like the network statement, the ospf interface command is used to indicate
the interface to run ospf on. By putting it on the loopback, the loopback
runs ospf...not the loopback and any interface that unnumbered to it. :)
The think I find interesting is the network statement for the loopback
address should have worked fine. The question is does it create the
loopback stub host entry AND the p2p entry? I have to try this as well.
Jason
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Eric Dobyns
> Sent: Thursday, July 05, 2007 10:10 AM
> To: 'Ben'; 'Gary Duncanson'
> Cc: 'Narbik Kocharians'; ccielab@groupstudy.com
> Subject: RE: PPPoFR
>
> Tried it to see. Neighbor adjacency only comes up when you place it
on
> the
> virtual-template. I was surprised. I set the frame up ptp, I suppose
you
> might get it up with multipoint at the hub and neighbor statements,
but I
> didn't try it to see.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Ben
> Sent: Thursday, July 05, 2007 2:52 AM
> To: Gary Duncanson
> Cc: eric_dobyns@yahoo.com; Narbik Kocharians; ccielab@groupstudy.com
> Subject: Re: PPPoFR
>
> I would place it on the loopback, the interface with an IP address.
>
>
> On 7/5/07, Gary Duncanson <gary.duncanson@googlemail.com> wrote:
> >
> > I will take a punt and say the the loopback.
> > ----- Original Message -----
> > From: "Eric Dobyns" <eric_dobyns@yahoo.com>
> > To: "'Narbik Kocharians'" <narbikk@gmail.com>; "'Gary Duncanson'"
> > <gary.duncanson@googlemail.com>
> > Cc: <ccielab@groupstudy.com>
> > Sent: Wednesday, July 04, 2007 10:18 PM
> > Subject: RE: PPPoFR
> >
> >
> > > Here's a question for you:
> > >
> > > If I were going to add the command "ip ospf 1 area 0" to one of
the
> > > interfaces for that frame link, would I add it to the serial
> > subinterface,
> > > the virtual template or the loopback?
> > >
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
Behalf
> Of
> > > Narbik Kocharians
> > > Sent: Wednesday, July 04, 2007 1:58 PM
> > > To: Gary Duncanson
> > > Cc: Eric Dobyns; ccielab@groupstudy.com
> > > Subject: Re: PPPoFR
> > >
> > > No worries mate
> > >
> > > On 7/4/07, Gary Duncanson <gary.duncanson@googlemail.com> wrote:
> > >>
> > >> Thanks Narbik, and thanks Eric for the config you posted.
> > >>
> > >> I can see how you would get a reply using the loopback interface.
> > >>
> > >> ----- Original Message -----
> > >>
> > >> *From:* Narbik Kocharians <narbikk@gmail.com>
> > >> *To:* Gary Duncanson <gary.duncanson@googlemail.com>
> > >> *Cc:* eric_dobyns@yahoo.com ; Scott Morris
<smorris@ipexpert.com> ;
> > >> ccielab@groupstudy.com
> > >> *Sent:* Wednesday, July 04, 2007 8:38 PM
> > >> *Subject:* Re: PPPoFR
> > >>
> > >>
> > >> I see your point, but this will also satisfy the requirement.
> > >>
> > >> On 7/4/07, Gary Duncanson <gary.duncanson@googlemail.com> wrote:
> > >> >
> > >> >
> > >> >
> > >> > No Advanced R&S Workbook here, but a similar situation did come
up
> on
> > >> > lab 3
> > >> > in my IPExpert Version 9.0 Workbook by Scott Morris starting on
> page
> > >> > 43!
> > >> >
> > >> > Does the ' you will be pinging another interface' hold up then
if
> you
> > >> > use
> > >> > ipunnumbered?
> > >> >
> > >> > ----- Original Message -----
> > >> > From: "Eric Dobyns" < eric_dobyns@yahoo.com>
> > >> > To: "'Gary Duncanson'" <gary.duncanson@googlemail.com>;
"'Narbik
> > >> > Kocharians'" <narbikk@gmail.com>
> > >> > Cc: <swm@emanon.com>; <ccielab@groupstudy.com >
> > >> > Sent: Wednesday, July 04, 2007 7:44 PM
> > >> > Subject: RE: PPPoFR
> > >> >
> > >> >
> > >> > > That would be Lab 7 in your CCIE Advanced R&S Workbook, by
Narbik
> > >> > > Kocharians....starting on page 60...
> > >> > >
> > >> > >
> > >> > >
> > >> > > -----Original Message-----
> > >> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > Behalf
> > >> > Of
> > >> > > Gary
> > >> > > Duncanson
> > >> > > Sent: Wednesday, July 04, 2007 10:46 AM
> > >> > > To: Narbik Kocharians
> > >> > > Cc: swm@emanon.com; ccielab@groupstudy.com
> > >> > > Subject: Re: PPPoFR
> > >> > >
> > >> > > Hi Narbik,
> > >> > >
> > >> > > Now that's interesting, how will that work for PPPoFR? How
does
> > that
> > >> > > satisfy
> > >> > > the need to ping your own IP address in terms of the IP
address
> > >> > assigned
> > >> > > to
> > >> > > your physical or subinterface used for a FR PVC?
> > >> > >
> > >> > > Regards
> > >> > > Gary
> > >> > > ----- Original Message -----
> > >> > > From: Narbik Kocharians
> > >> > > To: Gary Duncanson
> > >> > > Cc: Phillip Day ; ccielab@groupstudy.com
> > >> > > Sent: Wednesday, July 04, 2007 6:11 PM
> > >> > > Subject: Re: PPPoFR
> > >> > >
> > >> > >
> > >> > > Use the "ip unnumbered lo0" to assign an IP address, that
way
> you
> > >> > should
> > >> > > be
> > >> > > able to ping your own IP address.
> > >> > >
> > >> > >
> > >> > > On 7/4/07, Gary Duncanson <gary.duncanson@googlemail.com>
wrote:
> > >> > > Had this one myself recently.
> > >> > >
> > >> > > This insight came from Scott Morris..
> > >> > >
> > >> > > 'If you are doing PPPoFR, you will never be able to ping
your
> > own
> > >> > IP
> > >> > > address.
> > >> > >
> > >> > > (Unless you use unnumbered from another interface, but
> > technically
> > >> > then
> > >> > > you
> > >> > > are pinging that one!)'
> > >> > >
> > >> > > ----- Original Message -----
> > >> > > From: "Phillip Day" < Phillip.Day@telindus.co.uk>
> > >> > > To: <ccielab@groupstudy.com>
> > >> > > Sent: Wednesday, July 04, 2007 11:13 AM
> > >> > > Subject: PPPoFR
> > >> > >
> > >> > >
> > >> > > > Does anyone know of an obvious way I'm missing to ping
your
> > >> > > local
> > >> >
> > >> > > > interface on a PPPoFR link? And in a lab is it likely
you
> > would
> > >> > need
> > >> > > to
> > >> > > > be able to?
> > >> > > >
> > >> > > > Thanks in advance
> > >> > > >
> > >> > > > Phill Day
> > >> > > >
> > >> > > > This e-mail is private and may be confidential and is
for
> the
> > >> > > intended
> > >> > > > recipient only. If misdirected, please notify us by
> telephone
> > >> > and
> > >> > > confirm
> > >> > > > that it has been deleted from your system and any copies
> > >> > destroyed.
> > >> > > If
> > >> > > > you
> > >> > > > are not the intended recipient you are strictly
prohibited
> > from
> > >> > > using,
> > >> > > > printing, copying, distributing or disseminating this
e-mail
> > or
> > >> > any
> > >> > > > information contained in it. We use reasonable
endeavours
> to
> > >> > virus
> > >> > > scan
> > >> > > > all
> > >> > > > e-mails leaving the Company but no warranty is given
that
> this
> > >> > e-mail
> > >> > > and
> > >> > > > any
> > >> > > > attachments are virus free. You should undertake your
own
> > virus
> > >> > > checking.
> > >> > > > The right to monitor e-mail communications through our
> network
> > >> > > is
> > >> > > reserved
> > >> > > > by
> > >> > > > us.
> > >> > > >
> > >> > > >
> > >> > >
> > >> >
> >
This archive was generated by hypermail 2.1.4 : Sat Aug 18 2007 - 08:17:39 ART