From: Nick Shah (nshah@xxxxxxxxxxxxxx)
Date: Mon Jun 03 2002 - 20:49:08 GMT-3
Ademola, prolly I need to be more descriptive...
---> Say pseudo Router-ids is *not* disallowed ...
Then create more meaningful router-id's (1.1.1.1 for RtrA etc.)
----> Say pseudo Router-id's are disallowed explicitly, but router-id as
such is not disallowed.
Then use the technique I described, which is, after turning off ospf
on all the routers, note down what it has selected as router-id, and nail
them with the router-id command. This has obvious advantage, wherein if any
loopbacks etc. are added at a later time then the router-id will be
preserved on reboot.
-----> Router-id's pseudo or otherwise are explicitly disallowed.
Then read the entire lab and look for any ip addresses to be added
at a later time, think if that is going to create havoc on OSPF/BGP
router-id's, if it looks like that, then assign those ip addresses at the
beginning of the lab, so OSPF/BGP will select that ip address as the
router-id.
rgds
Nick
----- Original Message -----
From: "Ademola Osindero" <osindero@lagos.sns.slb.com>
To: "Denise Donohue" <denise@dtxnet.com>; "'Nick Shah'"
<nshah@connect.com.au>
Cc: <ccielab@groupstudy.com>
Sent: Tuesday, June 04, 2002 12:48 AM
Subject: RE: OSPF - practice approach (pseudo loopbacks)
> Group,
>
> I am kind of back to the question, "am I allowed to just pick any set of
ip
> addresses (just like I would for ipx routing) to ease ospf router
> identification?". I just got to know about it and thot it makes a lot of
> difference especially when you have configured your OSPF and now told to
> introduce another loopback address later.
>
> Andre, I want to go by your words, "nail it down". But can I choose a more
> friendly ip addresses rather than the given ip addresses.
>
> Guys, you can keep out the question of OSPF not coming out in the lab.
>
> Any proctor may help.
>
> Best Regards,
> Ademola
>
> Andre, At 08:40 PM 5/21/2002 -0400, Denise Donohue wrote:
> >Sorry for the misunderstanding. I was responding to what I read into
> >Bruce's answer. If you weren't allowed to nail the router id, then
that's a
> >good argument for at least skimming the entire test before starting.
Then
> >you could go ahead and put on any loopbacks before configuring the
routing
> >protocols.
> >
> >-----Original Message-----
> >From: Nick Shah [mailto:nshah@connect.com.au]
> >Sent: Sunday, June 02, 2002 8:33 PM
> >To: Denise Donohue; 'Bruce Williams'; 'Michael Snyder'
> >Cc: ccielab@groupstudy.com
> >Subject: Re: OSPF - practice approach (pseudo loopbacks)
> >
> >
> >Denise,
> >
> >Of course what you are telling is true, however, the discussion was
> >revolving around 2 aspects, one being that *what if* we are not allowed
to
> >use pseudo router id's ?
> >
> >Nick
> >-----Original Message-----
> >From: Denise Donohue <denise@dtxnet.com>
> >To: 'Nick Shah' <nshah@connect.com.au>; 'Bruce Williams'
> ><bruce@williamsnetworking.com>; 'Michael Snyder' <msnyder@ldd.net>
> >Cc: ccielab@groupstudy.com <ccielab@groupstudy.com>
> >Date: Monday, 3 June 2002 8:22
> >Subject: RE: OSPF - practice approach (pseudo loopbacks)
> >
> >
> > >One thing you should know about all this is that the router id doesn't
have
> > >to be an actual interface address on the router, in OSPF or in BGP
either.
> > >It's just a number the router uses to identify itself. You can use
1.1.1.1
> > >etc without creating any new interfaces.
> > >
> > >-----Original Message-----
> > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> > >Nick Shah
> > >Sent: Sunday, June 02, 2002 2:42 PM
> > >To: Bruce Williams; Michael Snyder
> > >Cc: ccielab@groupstudy.com
> > >Subject: Re: OSPF - practice approach (pseudo loopbacks)
> > >
> > >
> > >Guys,
> > >
> > >There are 2 approaches here ...We are..
> > >
> > >* allowed/disallowed to use our own router-id's (what we call pseudo
id's)
> > >* allowed/disallowed to *nail* the router-id's
> > >
> > >In the first scenario, if allowed we can use router-id 1.1.1.1 (for
RTRA)
> > >and so on. This obviously has its benefits (easy recognizability for
one,
> > >stability of virtual links etc. the other).
> > >
> > >Even if we are not allowed to do the first, we can still do the second,
> >how.
> > >Say for example, after turning on OSPF processes on all of the routers
in
> > >the lab, see what has been selected in terms of router-ids, say RtrA is
> > >192.168.250.250, still nail it as, router-id 192.168.250.250. This is
> >better
> > >because now whatever new loopbacks are added or if new ip addresses are
> > >assigned at a later stage in lab, the router id wont change on reload.
> > >
> > >What do you think of this ?
> > >
> > >rgds
> > >Nick
> > >----- Original Message -----
> > >From: "Bruce Williams" <bruce@williamsnetworking.com>
> > >To: "Michael Snyder" <msnyder@ldd.net>
> > >Cc: <ccielab@groupstudy.com>
> > >Sent: Monday, June 03, 2002 1:03 AM
> > >Subject: RE: OSPF - practice approach
> > >
> > >
> > >> That is what I figured. I will ask the proctor, but at least I know
that
> >I
> > >> am not the only one who does that. I guess that is all I was really
> > >looking
> > >> for. I kind of wanted to see if anyone else did the same thing and
you
> > >> validated that for me.
> > >>
> > >> Thanks,
> > >>
> > >> Bruce
> > >>
> > >> -----Original Message-----
> > >> From: Michael Snyder [mailto:msnyder@ldd.net]
> > >> Sent: Sunday, June 02, 2002 10:38 AM
> > >> To: 'Bruce Williams'
> > >> Cc: ccielab@groupstudy.com
> > >> Subject: RE: OSPF - practice approach
> > >>
> > >>
> > >> Save that question for the proctor. I suspect each test would be
> > >> different. Aren't you assuming all tests have ospf? Heck you may
get
> > >> ISIS.
> > >>
> > >> The short answer is that we don't know, and if we did know, we
couldn't
> > >> tell you.
> > >>
> > >> BTW, I do the same thing, it seems to be a standard practice. Here's
my
> > >> routing table from last night's lab.
> > >>
> > >> Gateway of last resort is not set
> > >>
> > >> 1.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> C 1.1.1.0 is directly connected, Loopback0
> > >> 2.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 2.2.2.0 [90/2809856] via 10.1.1.26, 14:30:33, Serial0
> > >> 3.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 3.3.3.0 [90/2297856] via 10.1.1.2, 14:30:24, Serial1
> > >> 4.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 4.4.4.0 [90/3321856] via 10.1.1.26, 07:42:02, Serial0
> > >> 5.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 5.5.5.0 [90/2297856] via 10.1.1.26, 14:30:33, Serial0
> > >> 6.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 6.6.6.0 [90/3321856] via 10.1.1.2, 07:42:02, Serial1
> > >> 7.0.0.0 0xFFFFFF00 is subnetted, 1 subnets
> > >> D 7.7.7.0 [90/2809856] via 10.1.1.2, 14:30:24, Serial1
> > >> 10.0.0.0 0xFFFFFFFC is subnetted, 7 subnets
> > >> D 10.1.1.8 [90/3193856] via 10.1.1.2, 14:30:24, Serial1
> > >> D 10.1.1.12 [90/3705856] via 10.1.1.2, 07:42:02, Serial1
> > >> [90/3705856] via 10.1.1.26, 07:42:02, Serial0
> > >> C 10.1.1.0 is directly connected, Serial1
> > >> D 10.1.1.4 [90/2681856] via 10.1.1.2, 14:31:24, Serial1
> > >> C 10.1.1.24 is directly connected, Serial0
> > >> D 10.1.1.16 [90/3193856] via 10.1.1.26, 14:31:34, Serial0
> > >> D 10.1.1.20 [90/2681856] via 10.1.1.26, 14:31:34, Serial0
> > >>
> > >>
> > >> -----Original Message-----
> > >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> > >> Bruce Williams
> > >> Sent: Sunday, June 02, 2002 8:47 AM
> > >> To: Andre Riscalla; Michael Popovich
> > >> Cc: Bauer, Rick; 'Jerry Haverkos'; Ademola Osindero;
> > >> ccielab@groupstudy.com
> > >> Subject: RE: OSPF - practice approach
> > >>
> > >> I know this is a queston for the proctor, but I am curious now. In
the
> > >> lab,
> > >> do you know if you are allowed to create your own loopbacks and make
> > >> those
> > >> loopbacks your router ids. For example, could I create a loopback
with
> > >> addresss 1.1.1.1 for R1 and 2.2.2.2 for R2 etc?
> > >>
> > >> Bruce Williams
> > >>
> > >> -----Original Message-----
> > >> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf
Of
> > >> Andre Riscalla
> > >> Sent: Saturday, June 01, 2002 11:41 PM
> > >> To: Michael Popovich
> > >> Cc: Bauer, Rick; 'Jerry Haverkos'; Ademola Osindero;
> > >> ccielab@groupstudy.com
> > >> Subject: Re: OSPF - practice approach
> > >>
> > >>
> > >> In that case, i think a good practice is to nail it down and
configure a
> > >> router-id under each and every OSPF process... if it's not otherwise
> > >> specified in the lab, you can do it.
> > >>
> > >> AR-
> > >>
> > >> On Wed, 29 May 2002, Michael Popovich wrote:
> > >>
> > >> > You'll just need to remember the rules that if you have loopback
> > >> interfaces
> > >> > the highest IP wins. If you add them later you'll need to change
the
> > >> > configurations for the virtual link or upon a reboot it is broken.
> > >> >
> > >> > MP
> > >> > ----- Original Message -----
> > >> > From: "Bauer, Rick" <BAUERR@toysrus.com>
> > >> > To: "'Jerry Haverkos'" <jhaverkos@columbus.rr.com>; "Ademola
Osindero"
> > >> > <osindero@lagos.sns.slb.com>; <ccielab@groupstudy.com>
> > >> > Sent: Wednesday, May 29, 2002 3:34 PM
> > >> > Subject: RE: OSPF - practice approach
> > >> >
> > >> >
> > >> > > And what happens when you add more loopback interfaces and reload
> > >> the
> > >> > > router? What if you have virtual links? Nail it up!
> > >> > >
> > >> > > -----Original Message-----
> > >> > > From: Jerry Haverkos [mailto:jhaverkos@columbus.rr.com]
> > >> > > Sent: Wednesday, May 29, 2002 3:56 PM
> > >> > > To: Ademola Osindero; ccielab@groupstudy.com
> > >> > > Subject: RE: OSPF - practice approach
> > >> > >
> > >> > >
> > >> > > A router-id will be picked for you, automatically.
> > >> > >
> > >> > > -----Original Message-----
> > >> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On
Behalf
> > >> Of
> > >> > > Ademola Osindero
> > >> > > Sent: Wednesday, May 29, 2002 12:02 PM
> > >> > > To: ccielab@groupstudy.com
> > >> > > Subject: OSPF - practice approach
> > >> > >
> > >> > >
> > >> > > Hi Group,
> > >> > >
> > >> > > I working on approaches of answering ques in the lab. Do I really
> > >> need
> > >> to
> > >> > > put a router id on my routers while configuring OSPF....am I
allowed
> > >> to
> > >> > > just pick up an ip address and use it?
> > >> > >
> > >> > > Regards
> > >> > >
> > >> > > Osindero Ademola
> > >> > > Schlumberger Network Solutions
> > >> > > Tel: 234 1 261 0446 Ext 5427
> > >> > > Fax 234 1 262 1034
> > >> > > email:osindero@lagos.sns.slb.com
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