Hey Ed and group! Remember, the prefix-list is a strange cookie -- Depending on the syntax / parameters the meaning changes completely!
For example: This will match the exact prefix 100.100.100.0 with a /24 mask ip prefix-list pants permit 100.100.100.0/24 This will match anything where the first 3 octets are 100 and ANY subnet mask...i.e 100.100.100.0/x where x is ANYTHING. It is now much broader and the / piece of the syntax has changed completely...we are now talking about the network portion of the prefix and not the subnet mask ip prefix-list pants permit 100.100.100.0/24 le 32 On Sun, May 2, 2010 at 6:01 PM, Bodnar, Edward <[email protected]> wrote: > I agree not sure why someone would do that but Believe it or not it helped > to clarify for me. > > > > From: Adam [mailto:[email protected]] > Sent: Sunday, May 02, 2010 5:59 PM > To: Bodnar, Edward > Cc: [email protected] > Subject: Re: [OSL | CCIE_RS] Vol 3 Lab 1 Task 3.3 > > > > Needless to say that does not look good :) If I recall correctly, IOS won't > accept such entry in prefix-list, "le y" should not be lower than value > specified with "/x". > > On Sun, May 2, 2010 at 11:43 PM, Adam <[email protected]> wrote: > > That means "I want to match networks with 201.2 in the first two octets, but > subnet mask should be 255.0.0.0 or less". > > > > On Sun, May 2, 2010 at 11:26 PM, Bodnar, Edward <[email protected]> > wrote: > > So is this valid? > > Ip prefix-list EIGRP permit 201.2.0.0/16 le 8 > > > > From: Adam [mailto:[email protected]] > Sent: Sunday, May 02, 2010 5:21 PM > To: Bodnar, Edward > Cc: [email protected] > Subject: Re: [OSL | CCIE_RS] Vol 3 Lab 1 Task 3.3 > > > > 201.2.0.0/16 means 201.2/16 subnet only, exactly this prefix, first 16 bits > have to be 201.2 and subnet mask must be set to 255.255.0.0 (in JunOS > route-lists there is an "exact" word for that). Exactly what you have > specified and nothing else. > 201.2.0.0/16 le 32 means that the first two octets still have to be 201.2, > but subnet masks can vary from /16 up to /32, which means that it covers > also subnets falling into 201.2/16 range. Match 201.2/16, don't care about > last two octets, but subnet mask must fall into <255.255.0.0; > 255.255.255.255> range. > > On Sun, May 2, 2010 at 11:06 PM, Bodnar, Edward <[email protected]> > wrote: > > Prefix lists are still getting me. > > > > In this task I did not use the le 32 and the end of my entries. Not sure I > understand why I would need that > > > > Example > > > > Ip prefix-list Ed permit 201.2.0.0/16 ß what I used > > Ip prefix-list EIGRP permit 201.2.0.0/16 le 32 ß answer key used > > > > > > Ed, > > > > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > -- Regards, Joe Astorino - CCIE #24347 Sr. Technical Instructor - IPexpert Mailto: [email protected] Telephone: +1.810.326.1444 Live Assistance, Please visit: www.ipexpert.com/chat eFax: +1.810.454.0130 IPexpert is a premier provider of Self-Study Workbooks, Video on Demand, Audio Tools, Online Hardware Rental and Classroom Training for the Cisco CCIE (R&S, Voice, Security & Service Provider) certification(s) with training locations throughout the United States, Europe, South Asia and Australia. Be sure to visit our online communities at www.ipexpert.com/communities and our public website at www.ipexpert.com _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
