When I set up my environment, I followed a "HowTo" posted by MrPaul on
7200.hacki.at. I also used a 3550 as the breakout switch initially and
could not get it to work. On page 8 of the HowTo there is a comment by
CLoSeR pointing out that the l2protocol-tunnel command is not supported
on 3550s on trunk ports.
I changed my breakout switch to a 3750 and it worked as advertised. A
3560 is also supposed to work.
HTH,
Chris
Ben Hughes wrote:
Hey guys,
I’ve just setup my lab with Dynamips and real switches. I’m using a
3550 as a breakout switch though and as a result can’t get l2protocol
tunnelling to work – ie no CDP/VTP/STP between virtual world and real
world. Just wondering if there is anything in IPExpert labs where the
l2protocol tunnelling would be a requirement?
Cheers,
Ben.
*From:* [email protected]
[mailto:[email protected]] *On Behalf Of *--Hammer--
*Sent:* Wednesday, 25 August 2010 2:31 PM
*To:* [email protected]
*Subject:* Re: [OSL | CCIE_RS] GNS3 as a study aid
Good response Adam. I too am using GNS3 with physical switches. I'm
working thru the IPExpert volumes and haven't seen any significant
problems yet. As someone who has successfully failed the lab I can say
that using GNS to prepare for the configuration section works pretty
well. If you don't have real switches, then you'll really need to
rent-a-rack at least a few times to get your switching skills homed.
Other than that, it's a great product.
--Hammer--
On 8/24/2010 5:58 PM, Adam Booth wrote:
Hi Andy,
Welcome to the list. I would like to suggest that rather than piggy
backing onto an existing mail thread and asking a completely different
topic that in the future you start a new one. The reason being is that
I don't think everyone will open up a thread asking about SNMP unless
they are interested, so you may miss out on their possible input about
a topic like using GNS3/Dynamips.
Tools like GNS3/dynamips can certainly be helpful and there are people
that use it as their main study aid but there are sometimes problems
and limitations that are generally chalked up to occurring with the
emulation platform. The volume 1 workbooks from IPExpert includes a
.net topology that can be used. To use dynamips effectively you are
going to have do a good amount of research and learning, searching the
mailing list archives, CCIE blogs, the Dynamips forum
http://7200emu.hacki.at/ and googling as well as fiddling around for
yourself prior to asking for help should be your tools - depending on
your circumstances this might be an added difficulty that you can do
without and so the other alternatives of renting time on a rack or
buying actual routers and switches for your home lab may be worth
while - or even using a combination of the different methods depending
on the technology you are using and the network complexity.
In my personal circumstances I am using dynamips and real switches but
if it gets to a particular point where I am not happy with how my
environment is performing, I am prepared to change to rack rentals. My
thoughts on the matter when I was first actually committing my
personal effort towards the CCIE are in my blog
http://noshut.blogspot.com/2010/02/is-having-home-lab-like-having-home-gym.html
- I haven't sat the exam so I cant say it has categorically work for
me and to be honest even if I purely used rack rentals, I think I
would use dynamips anyway as its good to quickly bang something
together and test if theres a particular problem case in your mind -
and its something you can carry about with you and use on a laptop -
not so each to lug a number of 2811s around with you :)
Hope that's of some help - I have changed the message subject so
hopefully you will also get some more opinions too.
Cheers,
Adam
On Wed, Aug 25, 2010 at 6:32 AM, Lackraj, Andy <[email protected]
<mailto:[email protected]>> wrote:
Hey guys,
Looking to do the IE and was wondering how many of you guys have used
GNS3 and how is it? Would it be adequate tool to prepare for the lab?
Any feedback is appreciated.
Thx..
------------------------------------------------------------------------
*From:* [email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On Behalf Of *Adam Booth
*Sent:* Tuesday, August 24, 2010 3:23 AM
*To:* Taqdir Singh
*Cc:* [email protected] <mailto:[email protected]>
*Subject:* Re: [OSL | CCIE_RS] snmp engine id
Hi Taqdir,
The engine id is used with the snmp user password to generate the MD5
digests (the system will not store the passwords - just the engine id
and MD5, so if one or the other changes, you need to use the password
and regenerate the MD5 hash. RFC2274 discusses the user security model)
Another thing I think was introduced with SNMPv3 but I'm pretty sure
can also be used with SNMP 2c is the use of SNMP Views. This basically
allow limiting which parts of the MIB tree that can be looked at for a
particular user or community, an example would to allow a managed
customer to pull out interface stats and cpu load but not see
everything else...
Cheers,
Adam
On Tue, Aug 24, 2010 at 4:34 PM, Taqdir Singh <[email protected]
<mailto:[email protected]>> wrote:
*Hi All,*
*In snmp v1 and v2c there was no concept of engine id and no
authentication and encryption*
*so snmp v3 came with md5 authentication and encryption of packets.*
*what is the purpose of snmp engine id local and remote in snmp v3?
.... default is also set...*
--
--
Taqdir Singh
/Networks
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