From: Rob Clav (robclav@gmail.com)
Date: Mon Mar 23 2009 - 17:18:35 ART
Hi Kelvin,
RIP database works in different way than EIGRP one. I mean, RIP
database is the RIB mirror (for RIP originated routes obviously)
except for Summary routes and connected netwoks. So, RIP Database
don't save backup routes, so what you can see at RIP Database is
already check it againts RIB. At EIGRP database you can see some
routes than you couldn't at rib. For instance, Feasible succesor ones.
Before to save the route at RIP Database, the router apply the
following checklist:
--Inbound update filters are processed (global and per-interface
distribute list).
--IP prefix matching any summary address configured with the ip
summary-address rip network mask on the incoming interface is ignored.
--If the IP prefix already exists in the RIP database, the metric in
the incoming route update is compared with the metric in RIP database.
Only the best RIP routes are retained in the RIP database (the RIP
database has no backup information like the EIGRP topology table).
--If the RIP route cannot be inserted in the IP routing table (another
route with a better administrative distance is already present in the
IP routing table), its not stored in the RIP database.
You can find and excelent explanation at this site:
http://wiki.nil.com/RIP_Route_Database
Feel you free to unicast me
Robclav
2009/3/23 Tharak Abraham <tharakabraham@gmail.com>:
> AD is what it matters when we take Rip and Eigrp in this instance.
> Rip and Eigrp will have its own databases, but which one does the router
> prefer and based on what?
>
> 120 or 90 (the lower the better).
>
> As Rob mentioned and just to cross check the same, you can either increase
> the AD of Eigrp above 120 or decrease the AD of Rip below 90 and see !
>
> Dont mix up FIB and RIB concepts here as the former is for fast lookup or
> fast switching and latter for normal cpu intensive routing table lookup !
>
> BR,
> Tharak.
>
> On Mon, Mar 23, 2009 at 8:42 PM, Kelvin Yeo
> <kelvinyeo@xtracommunication.com> wrote:
>>
>> Hi Robclav,
>>
>> Thanks for your response. My understanding is that rip database will
>> install routes when its received(except posion routes). AD is only compared
>> before installing into FIB if IOS have the same longest match prefix.
>>
>> Correct me if im wrong...
>>
>> Kelvin
>>
>> -----Original Message-----
>> From: robclav@gmail.com
>> Sent: f f d: , 24 d8 f , 2009 3:26 AM
>> To: Kelvin Yeo <kelvinyeo24@yahoo.com.sg>; 'Cisco certification'
>> <ccielab@groupstudy.com>
>> Subject: Re: RIP not installing routes into RIP database
>>
>> Hi Kelvin,
>> In order to see what is going on, try to modify RIP administrative
>> distance from 120 to 80 for instance. Then you will be able to see this
>> route installed at rip database instead of eigrp one.
>> The question is, which one is the purpose for diferents AD? How this is
>> translated to the route exchange?which routes are installed at rip database?
>>
>> I hope this help you,
>> Robclav
>>
>> BlackBerry de movistar, allm donde estis esta tu oficin@
>>
>> -----Original Message-----
>> From: "Kelvin Yeo" <kelvinyeo24@yahoo.com.sg>
>>
>> Date: Tue, 24 Mar 2009 02:19:47
>> To: 'Cisco certification'<ccielab@groupstudy.com>
>> Subject: RIP not installing routes into RIP database
>>
>>
>> Hi Forum,
>>
>>
>>
>> Quick and short question.
>>
>>
>>
>> I have 2 routers with a serial connection. RIP and EIGRP process is
>> enabled
>> on both routers. No filter-list or any list that will filter routes. 1
>> loopback has been installed into Router A. RIP and EIGRP has 'network' to
>> this loopback.
>>
>>
>>
>> router rip
>>
>> version 2
>>
>> network 1.0.0.0 < this is the loopback
>>
>> network 192.168.1.0
>>
>> no auto-summary
>>
>> router eigrp 10
>>
>> network 0.0.0.0
>>
>> no auto-summary
>>
>>
>>
>> On router B, I can see router A's loopback in EIGRP topology table, but I
>> do not see it in RIP database..and I missing some concept here because I
>> don't understand this result.
>>
>>
>>
>> >From B's 'debug ip rip', I can see it is receiving the update but it
>> just
>> doesn't install in the RIP database.
>>
>>
>>
>> *Mar 1 00:23:18.251: RIP: received v2 update from 192.168.1.1 on
>> Serial1/0
>>
>> *Mar 1 00:23:18.251: 1.1.1.0/24 via 0.0.0.0 in 1 hops
>>
>>
>>
>> Anyone can feedback?
>>
>>
>>
>> Rdgs,
>>
>> Kelvin
>>
>>
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>>
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