From: Packet Man (ccie2b@hotmail.com)
Date: Sat Mar 20 2004 - 13:49:25 GMT-3
As they say in my neck of the woods,...
Yuuu Da Mon
>From: "Brian McGahan" <bmcgahan@internetworkexpert.com>
>Reply-To: "Brian McGahan" <bmcgahan@internetworkexpert.com>
>To: "'Packet Man'" <ccie2b@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: Lab Tip question?
>Date: Sat, 20 Mar 2004 10:43:30 -0600
>
> The "no arp frame-relay" command has no affect. It is misdocumented
>in certain places that it stops the replies to inverse-arp requests. This
>is not true. A simple test of configuring "no arp frame-relay" and
>enabling
>the interface will show that is does not prevent dynamic mappings from
>being
>created.
>
> There are exactly three ways to stop frame relay inverse-arp:
>
>1. "no frame-relay inverse-arp"
>
> This disables the generation of InARP requests for all protocols out
>all DLCIs assigned to the interface. This command is only locally
>significant to the interface it is configured on, and it not inherited by
>multipoint subinterfaces if it is configured on a main interface.
>
>2. "no frame-relay inverse-arp [protocol] [dlci]"
>
> This disables the generation of InARP requests for the specified
>protocol and DLCI pair.
>
>3. "frame-relay map [protocol] [dlci]"
>
> This disables the generation of InARP requests for the specified
>protocol and DLCI pair.
>
>
> AFAIK there is no way to prevent a router from responding to a frame
>relay InARP request.
>
> Also, there is no way to stop the router from learning VC
>information from the frame relay cloud. DLCI information is advertised
>from
>the frame relay cloud to the end node via LMI. Inverse-ARP and LMI do not
>have any direct relationship.
>
>HTH,
>
>Brian McGahan, CCIE #8593
>bmcgahan@internetworkexpert.com
>
>Internetwork Expert, Inc.
>http://www.InternetworkExpert.com
>Toll Free: 877-224-8987 x 705
>Outside US: 775-826-4344 x 705
>
>
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Packet Man
> > Sent: Friday, March 19, 2004 3:50 PM
> > To: dswink@cisco.com; ccielab@groupstudy.com
> > Subject: RE: Lab Tip question?
> >
> > Hey Dave,
> >
> > From all the practice labs which have a requirement such as "do not use
> > any
> > Dlci's except those specified", I've gotten into the habit of entering
>"no
> > frame inverse-arp". But, I don't recall ever trying to confirm that
> > unused
> > DLci's don't even appear in output of "show fram pvc".
> >
> > As best as I can recall, one of those commands prevents an interface
>from
> > requesting the remote ip address while the other command prevents an
> > interface from responding to a request. Is that correct?
> >
> > If so, which command does which?
> >
> > Thanks
> >
> > BTW, This is the type of discussion I was hoping my Lab Tips concept
>would
> > generate. And, the wording of the tip I've added to my Tips file is,
>"If
> > only specified DLCI's are allowed, enter "no fram inv" and "no arp fram"
> >
> > Is there a better or more accurate way to state it?
> >
> >
> > >From: "Dave Swink (dswink)" <dswink@cisco.com>
> > >Reply-To: <dswink@cisco.com>
> > >To: "'Packet Man'" <ccie2b@hotmail.com>
> > >Subject: RE: Lab Tip question?
> > >Date: Fri, 19 Mar 2004 14:39:53 -0600
> > >
> > >Yeah, this is intended as a lab-centric tip only, not real-world. There
> > >could theoretically be a requirement that unspecified DLCIs not even
> > >appear in your "show frame-relay pvc".
> > >
> > >I got into the habit of using no arp frame-relay when I was frustrated
> > >with trying to kill unwanted DLCIs. If you configure the commands to
> > >prevent inverse arp after turning the interface up, you will need to
> > >reboot the router to get rid of them. It was a belt & suspenders thing.
> > >If no frame inverse-arp does the job by itself, that is great.
> > >
> > >Dave Swink, CCIE #11678
> > >
> > >-----Original Message-----
> > >From: Packet Man [mailto:ccie2b@hotmail.com]
> > >Sent: Friday, March 19, 2004 2:12 PM
> > >To: dswink@cisco.com
> > >Subject: Lab Tip question?
> > >
> > >Hey Dave,
> > >
> > >Thanks for your suggestion. I assume this tip applies to the situation
> > >where static f/r map statements are configured and no dynamic mapping
>is
> > >
> > >wanted. Yes?
> > >
> > >If that's the case, I've always found that no frame inverse-arp was
> > >sufficient to achieve that result. Therefore, under what circumstances
> > >would the "no arp frame-relay" be required?
> > >
> > >Thanks
> > >
> > >
> > > >From: "Dave Swink (dswink)" <dswink@cisco.com>
> > > >Reply-To: <dswink@cisco.com>
> > > >To: "'Packet Man'" <ccie2b@hotmail.com>,
><lkgilles_ccie@yahoo.com.au>,
> > >
> > > > <ccielab@groupstudy.com>
> > > >Subject: RE: Where's your Lab Tips contribution?
> > > >Date: Fri, 19 Mar 2004 13:54:33 -0600
> > > >
> > > >Configure "no arp frame-relay" and "no frame-relay inverse-arp"
>before
> > > >turning up a frame relay interface.
> > > >
> > > >Dave Swink, CCIE #11678
> > > >
> > > >-----Original Message-----
> > > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>Of
> > > >Packet Man
> > > >Sent: Friday, March 19, 2004 1:16 PM
> > > >To: lkgilles_ccie@yahoo.com.au; ccielab@groupstudy.com
> > > >Subject: Re:Where's your Lab Tips contribution?
> > > >
> > > >OK, so now you gotten some great (my personal opinion) lab tips, what
> > > >lab
> > > >tip(s) do you have to contribute?
> > > >
> > > >
> > > > >From: Lee Gillespie <lkgilles_ccie@yahoo.com.au>
> > > > >To: Packet Man <ccie2b@hotmail.com>
> > > > >Subject: Re: Lab Tips
> > > > >Date: Fri, 19 Mar 2004 11:00:32 -0800 (PST)
> > > > >
> > > > >Gotcha, I was just afraid there was some kinda reason it wouldnt
> > >work.
> > > >A
> > > > >lot of labs I have done have the requirment "make the BGP peers as
> > > >stable
> > > > >as possible" which I assume means peer to the Loopback.
> > > > >
> > > > >
> > > > >
> > > > >Packet Man <ccie2b@hotmail.com> wrote:
> > > > >Only because it takes more time to configure. And, if it isn't
> > > >required,
> > > > >why
> > > > >spend the time and introduce the possibility of typo's and other
> > > >potential
> > > > >misconfig's?
> > > > >
> > > > >
> > > > > >From: Lee Gillespie
> > > > > >To: Packet Man
> > > > > >Subject: Re: Lab Tips
> > > > > >Date: Thu, 18 Mar 2004 14:50:42 -0800 (PST)
> > > > > >
> > > > > >Why dont you use Loopbacks for iBGP peering?
> > > > > >
> > > > > >Packet Man wrote:Hi all,
> > > > > >
> > > > > >I've created a "Lab Tips" file of small items - factoids,
> > >reminders,
> > > > > >suggestions, etc, I tend to forget. This is something I can refer
> > >to
> > > > > >constantly when I'm doing practice labs or just have a few
>minutes
> > >to
> > > > > >spare.
> > > > > >
> > > > > >Here's a snippet from my Tips file.
> > > > > >
> > > > > >BGP
> > > > > >Hard code router-id
> > > > > >Don't use loopbacks for ibgp peering unless explicitly required
> > > > > >Look for nei ... next-hop-self requirement especially on F/R hub
> > >and
> > > > > >ethernets
> > > > > >Disable bgp client to client reflection when clients are fully
> > >meshed
> > > > > >Turn off auto-sum & sync unless explicitly required
> > > > > >Reset BGP sessions using hard reset rather than soft reset.
> > > > > >Know how to config nei xxxx local-as in combo with RR.
> > > > > >Know all ways to config dampening
> > > > > >
> > > > > >I'm sharing this with GS because I suspect many candidates might
> > >also
> > > >
> > > > >have
> > > > > >something like this. And, I thought that with all the great brain
> > > >power
> > > > > >among GS subscribers we could all help each other by adding tips
>to
> > > >such
> > > > >a
> > > > > >file.
> > > > > >
> > > > > >Here's my definition of what makes for a good tip.
> > > > > >
> > > > > >1) A tip may not in any way violate the NDA
> > > > > >2) A good tip should be something that might be easily forgotten
> > > >because
> > > > > >it's not that often encountered or somehow different from the
> > > >ordinary.
> > > > >For
> > > > > >example, when configuring ISIS over frame relay, don't forget to
> > > >enter
> > > > >the
> > > > > >"fram map clns broadcast" statement. For me, this is a good tip
> > > > > >because I personally don't practice ISIS that often and I seem to
> > > >almost
> > > > > >always forget that command.
> > > > > >
> > > > > >3) A good tip must be short and clear because the whole idea
>behind
> > > >this
> > > > > >file is to provide a quick reminder of various networking facts
> > >that
> > > >can
> > > > > >come in handy during the actual lab.
> > > > > >
> > > > > >4) A good tip must should not waste time going into the "why" of
> > >the
> > > >fact
> > > > > >or
> > > > > >all the various permutations. For that, anyone interested can
> > > >research
> > > > >the
> > > > > >"why" of the fact on their own.
> > > > > >
> > > > > >5) A good tip for one person might not be at all useful to
>someone
> > > >else.
> > > > >We
> > > > > >each tend to remember and forget different things. But, for
> > >example,
> > > >over
> > > > > >time the BGP tips section may include 30 items and while I doubt
> > >all
> > > >30
> > > > > >items will be useful to all people, I'm sure that 5 or 10 or 15
>of
> > > >the
> > > > >tips
> > > > > >will be useful to many people - just that it won't be the same 5
>or
> > > >10 or
> > > > > >15
> > > > > >tips.
> > > > > >
> > > > > >6) A good tip must be potentially relevant to a ccie R&S
>candidate.
> > > > > >Therefore, I ask that Off Topic comments be submitted elsewhere -
> > > >Let's
> > > > > >keep
> > > > > >posts with the subject "Lab Tips" focus on just that.
> > > > > >
> > > > > >It's my hope that over time, with the input of a lots of people
> > >here,
> > > >
> > > > >this
> > > > > >lab tips file will grow to include tips that cover every topic
> > > > >potentially
> > > > > >on the R&S lab exam. And, that as a result, we can each add the
> > >most
> > > > > >personally valuable tips from this group effort to our own lab
>tips
> > > >file.
> > > > > >
> > > > > >Right now, my tips file has no entries for voice. So, I'd like to
> > > >start
> > > > >off
> > > > > >by asking people to submit their voice config tips. Of course,
>tips
> > > >on
> > > > >any
> > > > > >potential lab are also welcomed.
> > > > > >
> > > > > >Here are some other potential tips topics I hope people feel free
> > >to
> > > > >submit
> > > > > >tips to.
> > > > > >
> > > > > >Redistribution
> > > > > >
> > > > > >ATM
> > > > > >
> > > > > >3550
> > > > > >
> > > > > >OSPF
> > > > > >
> > > > > >NAT
> > > > > >
> > > > > >HSRP
> > > > > >
> > > > > >F/R
> > > > > >
> > > > > >ISDN
> > > > > >
> > > > > >QOS
> > > > > >
> > > > > >Multicast
> > > > > >
> > > > > >NTP
> > > > > >
> > > > > >Voice
> > > > > >
> > > > > >Eigrp
> > > > > >
> > > > > >Please add your tip under the appropriate heading and send back
>to
> > > >GS.
> > > > > >
> > > > > >Hope this helps lots of people.
> > > > > >
> > > > > >Packet Man
> > > > > >
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