as i'll remember on this book http://www.amazon.com/Routing-Switching-Certification-Guide-Edition/dp/1587059800/ref=dp_ob_title_bk
i'll remember the N WLLA OMNI BGP Path Decision Control. ( * Table 11-8* *BGP Decision Process Mnemonic: N WLLA OMNI* http://jampad.net/Library/ccie/images/000848.jpg The first mnemonic step is to memorize the nine trigger letters—single letters that, once memorized, should hopefully trigger your memory to recall some short phrase that describes the logic of each decision point. Of course, memorizing nine seemingly random letters is not easy. So, memorize them as three groups: N WLLA OMNI Note The nine letters are organized as shown here for several reasons. First, the single letter N, for Step 0, is purposefully separated from the other two groups because it can be argued that this step is not really part of the decision process. OMNI was separated because it is a commonly known English language prefix. And WLLA was just left over after designating OMNI. here a good case discussed on cisco network learning. https://learningnetwork.cisco.com/thread/47114 best regards my friends.! Hope this helps to newcomers to remember the path selection point of view of wendell's odom. Edgar On Tue, Nov 13, 2012 at 12:44 PM, imad Abdallah <[email protected]>wrote: > Thanks Marko. > > > Sent from my iPhone > > On Nov 13, 2012, at 6:41 PM, "Marko Milivojevic" <[email protected]> > wrote: > > > I believe it refers to the fact that the route itself is perfectly fine > - has all the mandatory attributes, wasn't rejected by filters, etc. > > > > -- > > Marko Milivojevic - CCIE #18427 (SP R&S) > > Senior CCIE Instructor - IPexpert > > > > :: This message was sent from a mobile device. I apologize for errors > and brevity. :: > > > > On Nov 13, 2012, at 7:38, imad Abdallah <[email protected]> > wrote: > > > >> This is the cause of my confusion. > >> Shouldn't the route be invalid if next_hope is unreachable? > >> Or the term "valid" in show ip bgp xxxx denotes a different meaning? > >> What about show ip bgp, the route is for sure not denoted as best (>), > yet it's still denoted as valid (*)!! > >> > >> Sent from my iPhone > >> > >> On Nov 13, 2012, at 6:32 PM, "Marko Milivojevic" <[email protected]> > wrote: > >> > >>> Next hop is not reachable. > >>> > >>> -- > >>> Marko Milivojevic - CCIE #18427 (SP R&S) > >>> Senior CCIE Instructor - IPexpert > >>> > >>> :: This message was sent from a mobile device. I apologize for errors > and brevity. :: > >>> > >>> On Nov 12, 2012, at 18:01, imad Abdallah <[email protected]> > wrote: > >>> > >>>> Here's the relevant outputs: > >>>> > >>>> sh ip bgp 110.0.0.0 > >>>> BGP routing table entry for 110.0.0.0/8, version 0 > >>>> Paths: (1 available, no best path) > >>>> Not advertised to any peer > >>>> 54 50 60, (Received from a RR-client) > >>>> 23.0.0.3 (inaccessible) from 12.0.0.2 (2.2.2.2) > >>>> Origin IGP, metric 0, localpref 100, valid, internal > >>>> > >>>> show ip rou 23.0.0.3 > >>>> % Network not in table > >>>> > >>>>> From: [email protected] > >>>>> Date: Tue, 13 Nov 2012 04:50:11 +0300 > >>>>> To: [email protected] > >>>>> CC: [email protected] > >>>>> Subject: Re: [OSL | CCIE_RS] BGP Valid Routes > >>>>> > >>>>> When i run sh ip bgp ipaddress > >>>>> It say: > >>>>> > >>>>> Bestpath 0. > >>>>> > >>>>> Not advertised to any neighbor. > >>>>> > >>>>> But it is still considered valid! > >>>>> > >>>>> Sent from my iPhone > >>>>> > >>>>> On Nov 13, 2012, at 4:46 AM, "Samir Idris" <[email protected]> > wrote: > >>>>> > >>>>>> where do you see it as valid? Locally? > >>>>>> > >>>>>> On Tuesday, November 13, 2012, imad Abdallah < > [email protected]> wrote: > >>>>>>> Hi All, > >>>>>>> What's Cisco's criteria on setting a BGP route as valid?I used to > think that the route must pass a series of check including "check if > NEXT_HOPE is reachable". But I did a small lab where the NEXT_HOPE is > unreachable but the BGP route still shows as "valid"!Couldn't find a clear > answer from Cisco documentation. > >>>>>>> _______________________________________________ > >>>>>>> For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > >>>>>>> > >>>>>>> Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > >>>>>>> > >>>>>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >>>>>> > >>>>>> -- > >>>>>> Samir Idris > >>>>> _______________________________________________ > >>>>> For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > >>>>> > >>>>> Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > >>>>> > >>>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs > >>>> > >>>> _______________________________________________ > >>>> For more information regarding industry leading CCIE Lab training, > please visit www.ipexpert.com > >>>> > >>>> Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > >>>> > >>>> http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com > > http://onlinestudylist.com/mailman/listinfo/ccie_rs > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
