Re: IERS Lab4 Task1.3 - Loopguard and UDLD

Yes indeed : ) Just to be clear in MOST environments you probably see
one or the other. If you do both, it just gives you that much more
pretection against loops. That and of course there is nothing
"normal" about the CCIE lab.

On Sun, Jan 24, 2010 at 12:16 PM, Nadeem Rafi <nrafia_at_gmail.com> wrote:
> Thanks for this link.. mis-wiring is new to me :) so much to learn in this
> short period of life.
> Thanks again.
>
> On Sun, Jan 24, 2010 at 8:08 PM, Joe Astorino <jastorino_at_ipexpert.com>
> wrote:
>>
>> Hello,
>>
>> UDLD and loopguard are essentially two ways to solve the same problem
>> using different methods. Like Nadeem said, UDLD physically detects
>> the uni-directional links, whereas loopguard is more geared towards
>> STP specifically. Typically you will deploy one or the other. You
>> may want to check out the following link which does a nice comparison
>> : )
>>
>>
>> http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094640.shtml#loop_guard_vs_uld
>>
>> On Sun, Jan 24, 2010 at 7:05 AM, Michael McFarlin
>> <router.genie_at_gmail.com> wrote:
>> > Experts,
>> >
>> > I have a question about UDLD and Loopguard in one of the IERS labs. I
>> > don't
>> > think that loopguard is needed at all here. Why would you have to worry
>> > about SW1 making the Fa0/15 a designated port if UDLD has already taken
>> > the
>> > port down? By default UDLD acts faster than Loopguard by default right?
>> >
>> >
>> > Task
>> >
>> > Administrators of your network are concerned about SW1 and SW2 not
>> > being able to detect a link failure on port Fa0/15.
>> >
>> > Configure SW1 and SW2 so that port Fa0/15 is brought down in the case
>> > that either switch can send traffic, but not receive, or vice versa.
>> >
>> > As an additional precaution, configure SW1 so that interface Fa0/15 is
>> > not
>> > mistakenly elected as a designated port in the above case.
>> >
>> > Answer
>> >
>> > SW1:
>> > interface FastEthernet0/15
>> > udld port aggressive
>> > spanning-tree guard loop
>> > SW2:
>> > interface FastEthernet0/15
>> > udld port aggressive
>> >
>> >
>> > -Mike
>> >
>> >
>> > Blogs and organic groups at http://www.ccie.net
>> >
>> > _______________________________________________________________________
>> > Subscription information may be found at:
>> > http://www.groupstudy.com/list/CCIELab.html
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>> --
>> Regards,
>>
>> Joe Astorino CCIE #24347 (R&S)
>> Sr. Technical Instructor - IPexpert
>> Mailto: jastorino_at_ipexpert.com
>> Telephone: +1.810.326.1444
>> Live Assistance, Please visit: www.ipexpert.com/chat
>> eFax: +1.810.454.0130
>>
>> IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA
>> (R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice,
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>> out our online communities at www.ipexpert.com/communities and our
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>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>
>

-- 
Regards,
Joe Astorino CCIE #24347 (R&S)
Sr. Technical Instructor - IPexpert
Mailto: jastorino_at_ipexpert.com
Telephone: +1.810.326.1444
Live Assistance, Please visit: www.ipexpert.com/chat
eFax: +1.810.454.0130
IPexpert is a premier provider of Classroom and Self-Study Cisco CCNA
(R&S, Voice & Security), CCNP, CCVP, CCSP and CCIE (R&S, Voice,
Security & Service Provider) Certification Training with locations
throughout the United States, Europe and Australia. Be sure to check
out our online communities at www.ipexpert.com/communities and our
public website at www.ipexpert.com
Blogs and organic groups at http://www.ccie.net