From: Thameem Maranveetil Parambath (tparamba@thecontactcentre.ae)
Date: Tue Mar 24 2009 - 00:15:32 ART
Thanks for the detailed explanation Rob..
regards,
Thameem
Rob
Clav <robclav@gmail.com>
Sent by: nobody@groupstudy.com
24/03/2009 12:23 AM
Please respond to
Rob Clav <robclav@gmail.com>
To
Tharak Abraham
<tharakabraham@gmail.com>
cc
Kelvin Yeo <kelvinyeo@xtracommunication.com>,
Kelvin Yeo
<kelvinyeo24@yahoo.com.sg>, Cisco certification
<ccielab@groupstudy.com>
Subject
Re: RIP not installing routes into RIP
database
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
>>
>>
>> Blogs and organic groups at
http://www.ccie.net
>>
>>
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:06 ART