From: Scott Morris (swm@emanon.com)
Date: Mon Nov 07 2005 - 01:03:42 GMT-3
According to the docs on the CD:
" Inverse ARP is enabled by default for IP and IPX if the protocol is
already running on the ATM interface or subinterface and no static map is
configured. You will disable Inverse ARP if you configure a static map for
IP or IPX. "
When you use the "protocol" command, that is establishing a static map! You
can verify this with "show atm map" output. It it not necessary to do any
further disabling.
For demand-circuit, if you deny ospf from interesting traffic, will that
side be able to dial in case any routing information changes? If they both
figure out a change at the same time, it's possible that you could get two
calls, but that depends a lot on the structure (and looping in the
background?) of your network, and not incredibly likely.
Just imagine that your wife wants you to call, and you never do until she's
already asleep. It's karma. ;)
_____
From: Niche [mailto:jackyliu419@gmail.com]
Sent: Sunday, November 06, 2005 8:39 PM
To: Scott Morris
Cc: Desmond Ong; ccielab@groupstudy.com
Subject: Re: Workbooks practice doubts
Hi Scott,
Hope you don't mind to clarify my concept on this point:
>4) under atm, when ask not to rely on remote router for arp, i need to
>configure "no protocol ip inarp" together with no atm "ilmi-keepalive"
>right?
>>4. The ilmi-keepalive part seems to be a command that magically >>pops up
on some IOS versions/routers, but it isn't a part of the inarp >>process
AFAIK
According to the document I read from Cisco document (I don't have any ATM
to lab =/), inarp is off by default. So that's why usually we need static
mapping for the remote end,
"protocol ip x.x.x.x broadcast"
I assume "no protocol ip inarp" actually is just a good-habit practice
instead of must-have procedure, am I correct?
For "ospf demand-circuit", if both side are being required has dialing
capability, I will put it on one side and the other side i will just deny
OSPF in dialer-list... just imagine you would like to call your wife and you
wife would like to call you at the same time.
Cheers~
Jacky
On 11/7/05, Scott Morris <swm@emanon.com> wrote:
1. If you want to restrict things, you should do it for all your vty ports.
Most people think of 0-4, because those have always been the "defaults" for
a long, long time.
2. Not necessary. Some people do to make themselves feel better though.
3. What methods are available for you to use? ;)
4. The ilmi-keepalive part seems to be a command that magically pops up on
some IOS versions/routers, but it isn't a part of the inarp process AFAIK
5. You'd have to answer that based on what your scenario/topology is to
figure out what's best. Have you labbed it to see what does or doesn't
happen?
6. Who is doing the dialing? If both sides can initiate a call, then I'd
say yes. If not, no. *shrug*
7. This is a design thing, and can lead to some serious sub-optimal routing
in your network. Will you be counted off for that? Maybe, maybe not. But
there is no perfect answer for this one.
8. See the archives. You don't have to unless the lab says to. Many
people do like the magical stuff, many people do not. I'm one of the
latter, but that's just me!
All of these questions are great ones, but unfortunately, they may also come
with the "it depends" caveat! Try different things in context of the lab
you are working on to see what does or doesn't happen. You'll learn lots
along the way, and may answer your own question, at least within that
topology set!
Cheers,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com
<mailto:nobody@groupstudy.com> ] On Behalf Of
Desmond Ong
Sent: Sunday, November 06, 2005 6:44 AM
To: ccielab@groupstudy.com
Subject: Workbooks practice doubts
Hi there,
i am having some doubts while doing my workbooks...
1) if i want to prevent telnet access to my router, i need to put in
access-class XXX under line vty 0 4. do i need to put it under line vty 5
15?
2) how to determine which side of the isdn router to put the isdn ospf
demand circuit command? can i put on both sides?
3)when ask not to use static mapping on atm, how to i configure
4) under atm, when ask not to rely on remote router for arp, i need to
configure "no protocol ip inarp" together with no atm "ilmi-keepalive"
right?
5) under frame-relay, when ask not to rely on remote router for arp, i need
to put " no frame-relay inarp", how about no arp frame-relay" so that i will
not response to other router arp request...
6)Does the "dialer-load threshold either" command need to put on both side
of the isdn router when not explicitly asked?
7)when configuring bgp, if by next hop is available by IGP, can i still put
in the next-hop-self command under every peering to ibgp peers?
8)ipv6 - do we need to put in eui-64 for site local address? i understand is
for automatically assigning the host portion of the address...
apologise for the lengthy questions.....
Thanks!
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