OK. That may be why I'm working. I have a 3750 breakout switch and 3560s
downstream for the lab. I haven't been able to get home and look at my
config yet but I knew I had some L2 working fine with my L2 tunnel
config on the breakout switch. I didn't realize the limitation could be
the 3550 breakout switch. Thanks for the heads up.
--Hammer--
On 8/25/2010 10:13 AM, Chris Dudley wrote:
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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