The validation done by RIP when a source interface and destination
interface are using different masks can be disabled with
# router rip
# no validate-update source
That will work if R1 and R2 has different masks. Not sure though what
the impact would be with the loopback being whatever.
-- <ruhann> ww.routing-bits.com On Tue, Feb 16, 2010 at 10:17 PM, miroslav.kosut <miroslav.kosut_at_gmail.com> wrote: > Oh I had a small typo. The update received on /24 is SENT only via /24 > interface. > > It behaves the same way as if you were running two separate RIP instances in > separate VRFs. One VRF includes /16 interfaces and the other one includes > /24 only. > > S pozdravom / Regards, > Miroslav Kosut > > On 16.2.2010, at 19:17, Miroslav Kosut <miroslav.kosut_at_gmail.com> wrote: > >> Hello, >> >> I used to lab one scenario with RIPv1 having four interfaces. All >> belonging to the same classful network of 10.0.0.0/8. Two of them were >> having the mask /16 and the other ones were having /24. >> >> Now the interesting part: >> >> The update I received on /16 interface was sent only through the other /16 >> interface AND NOT VIA /24 INTERFACES. >> The same is true for /24 interfaces. The update I received on /24 >> interface I didn't send out the other /24 interface. >> >> At least subnets of 10.0.0.0/8 have not been forwarded to both /16 and /24 >> interfaces. I am not sure about different classful networks now.. I forgot >> this part, it was even years ago. >> >> Hth >> >> Regards, >> Miro >> >> On Feb 16, 2010, at 7:07 PM, Marko Milivojevic wrote: >> >>> Hello, >>> >>> You guys are missing an important thing here... RIPv1 does not support >>> VLSM, but it DOES support subnetting, as long as masks are of equal >>> length... So, if you have two /24 subnets from major /8 network, they >>> will be sent out. Now, the thing here is... if you use RIPv1, it >>> cannot handle variable masks, because it's ... classless. Try >>> configuring all interfaces on your routers with the same mask and see >>> what happens. >>> >>> -- >>> Marko Milivojevic - CCIE #18427 >>> Senior Technical Instructor - IPexpert >>> >>> Mailto: markom_at_ipexpert.com >>> Telephone: +1.810.326.1444 >>> Fax: +1.810.454.0130 >>> R&S Video on Demand Demo: http://bit.ly/aFyrU4 >>> >>> On Tue, Feb 16, 2010 at 17:55, Roy Waterman <roy.waterman_at_gmail.com> >>> wrote: >>>> >>>> Actually all disregard my last post :) >>>> Labbed it up exactly and saw this: >>>> >>>> R1# >>>> RIP: sending v1 update to 255.255.255.255 via Serial0/0.12 (10.1.0.1) >>>> RIP: build update entries - suppressing null update >>>> R1# >>>> >>>> R2# >>>> RIP: sending v1 update to 255.255.255.255 via Serial0/0.21 (10.1.0.2) >>>> RIP: build update entries - suppressing null update >>>> >>>> ---------------- >>>> >>>> If a /24 mask is used instead of the /16 between R1 & R2, it changes >>>> things: >>>> >>>> RIP: sending v1 update to 255.255.255.255 via Loopback0 (10.2.0.1) >>>> RIP: build update entries >>>> B B B B subnet 10.1.0.0 metric 1 >>>> B B B B subnet 10.3.0.0 metric 2 >>>> >>>> R1#sh ip ro rip >>>> B B 10.0.0.0/24 is subnetted, 5 subnets >>>> R B B B 10.3.0.0 [120/1] via 10.1.0.2, 00:00:06, Serial0/0.12 >>>> >>>> >>>> Gotta love RIPv1. >>>> >>>> >>>> Regards >>>> Roy >>>> >>>> >>>> >>>> On 16 February 2010 17:46, Tony Schaffran (GS) >>>> <groupstudy_at_cconlinelabs.com>wrote: >>>> >>>>> I am not sure. B This is not what I would expect of RIPv1. >>>>> >>>>> Maybe somebody with a more technical answer can chime in. >>>>> >>>>> As this has not been a topic of the CCIE blueprint for some time now >>>>> and I >>>>> have not come across this in an actual network for even longer, I just >>>>> do >>>>> not have any more knowledge of it. >>>>> >>>>> Sorry. >>>>> >>>>> Tony Schaffran >>>>> Sr. Network Consultant >>>>> CCIE #11071 >>>>> CCNP, CCNA, CCDA, >>>>> NNCDS, NNCSS, CNE, MCSE >>>>> >>>>> CCOnlineLabs >>>>> Your #1 choice for online Cisco rack rentals. >>>>> >>>>> >>>>> From: Sarad [mailto:tosara_at_gmail.com] >>>>> Sent: Tuesday, February 16, 2010 9:42 AM >>>>> To: groupstudy_at_cconlinelabs.com >>>>> Cc: Nadeem Rafi; Cisco certification >>>>> Subject: Re: RIP V1 VLSM >>>>> >>>>> Hi tony, >>>>> >>>>> But as it is a contiguous network it should advertise /16 isnt it? . I >>>>> initially thought it should also advertise /24 :(. I am trying to catch >>>>> what >>>>> happen with the debug but it doesnt show much pls share if you can >>>>> capture >>>>> anything on debug which shows why it is not advertising. >>>>> >>>>> Sara >>>>> On Tue, Feb 16, 2010 at 11:05 PM, Tony Schaffran (GS) >>>>> <groupstudy_at_cconlinelabs.com> wrote: >>>>> Interesting. B I would not even expect the /16 to be advertised, but it >>>>> is >>>>> as >>>>> you describe. >>>>> >>>>> Also as you describe, the /24 definitely does not get advertised. >>>>> >>>>> Tony Schaffran >>>>> Sr. Network Consultant >>>>> CCIE #11071 >>>>> CCNP, CCNA, CCDA, >>>>> NNCDS, NNCSS, CNE, MCSE >>>>> >>>>> CCOnlineLabs >>>>> Your #1 choice for online Cisco rack rentals. >>>>> >>>>> >>>>> From: Sarad [mailto:tosara_at_gmail.com] >>>>> Sent: Tuesday, February 16, 2010 9:31 AM >>>>> To: groupstudy_at_cconlinelabs.com >>>>> Cc: Nadeem Rafi; Cisco certification >>>>> >>>>> Subject: Re: RIP V1 VLSM >>>>> >>>>> Yes I have set it up, as per theory of RIP as it is a contiguous >>>>> network >>>>> (10 >>>>> range) it should send it. When the loopback is a /16 it sends the >>>>> loopbacks >>>>> but when I change it to /24 it doesnt send it. So is this a >>>>> illustration of >>>>> RIPV1 does not support VLSM ? >>>>> >>>>> >>>>> On Tue, Feb 16, 2010 at 10:39 PM, Tony Schaffran (GS) >>>>> <groupstudy_at_cconlinelabs.com> wrote: >>>>> I do not think RIPv1 will be sending /16 >>>>> >>>>> RIPv1 is classless and 10.x.x.x is /8 >>>>> >>>>> Have you configured this in a lba to see for yourself? >>>>> >>>>> Tony Schaffran >>>>> Sr. Network Consultant >>>>> CCIE #11071 >>>>> CCNP, CCNA, CCDA, >>>>> NNCDS, NNCSS, CNE, MCSE >>>>> >>>>> CCOnlineLabs >>>>> Your #1 choice for online Cisco rack rentals. >>>>> >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of >>>>> Nadeem Rafi >>>>> Sent: Tuesday, February 16, 2010 8:53 AM >>>>> To: Sarad >>>>> Cc: Cisco certification >>>>> Subject: Re: RIP V1 VLSM >>>>> >>>>> you will not be able to see /24 as rip v1 will be sending /16 major >>>>> network >>>>> only. >>>>> >>>>> HTH >>>>> >>>>> On Tue, Feb 16, 2010 at 7:39 PM, Sarad <tosara_at_gmail.com> wrote: >>>>> >>>>>> Hi Expert, >>>>>> >>>>>> If I have the following scenario, that is two routers connected back >>>>>> to >>>>>> back >>>>>> with a 10 range /16 ip & there are two loopbacks configured on each >>>>> >>>>> router >>>>>> >>>>>> with the same class IPs. If I run RIPV1 on this. Will it advertise my >>>>>> loopbacks to each other. >>>>>> >>>>>> B B B R1 >>>>>> R2 >>>>>> S0 - 10.1.0.1/16 <---------------------------> S0 -10.1.0.2/16 >>>>>> L0 - 10.2.0.1/24 B B B B B B B B B B B B B B B B B B >>>>>> B B L0 - >>>>> >>>>> 10.3.0.1/24 >>>>>> >>>>>> Regards >>>>>> Sara >>>>>> >>>>>> >>>>>> Blogs and organic groups at http://www.ccie.net >>>>>> >>>>>> >>>>>> _______________________________________________________________________ > > >>>>>> Subscription information may be found at: >>>>>> http://www.groupstudy.com/list/CCIELab.html >>>>> >>>>> >>>>> Blogs and organic groups at http://www.ccie.net >>>>> >>>>> _______________________________________________________________________ > > >>>>> Subscription information may be found at: >>>>> http://www.groupstudy.com/list/CCIELab.html >>>>> >>>>> >>>>> Blogs and organic groups at http://www.ccie.net >>>>> >>>>> _______________________________________________________________________ > > >>>>> Subscription information may be found at: >>>>> http://www.groupstudy.com/list/CCIELab.html >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> -- >>>> Regards >>>> Roy >>>> >>>> >>>> Blogs and organic groups at http://www.ccie.net >>>> >>>> _______________________________________________________________________ > > >>>> Subscription information may be found at: >>>> http://www.groupstudy.com/list/CCIELab.html >>> >>> >>> Blogs and organic groups at http://www.ccie.net >>> >>> _______________________________________________________________________ > > >>> Subscription information may be found at: >>> http://www.groupstudy.com/list/CCIELab.html > > > Blogs and organic groups at http://www.ccie.net > > _______________________________________________________________________ > Subscription information may be found > at:http://www.groupstudy.com/list/CCIELab.html Blogs and organic groups at http://www.ccie.netReceived on Wed Feb 17 2010 - 17:39:40 ART
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