From: marish shah (contactmarish@gmail.com)
Date: Tue Feb 24 2009 - 06:07:47 ARST
I think it is somthing related with cef because when I disabled R4 chose
correct path for R5 loopback s0/1.And when I enble again it show me same
result for R5 loopback it chose s0/0 which is frame relay but in mu sh ip
route 150.1.5.5 output it show me the prefred path is s0/1 point to point
link
Correct If I'm wrong
actually what happen when route come to router it fisrt perform longest
match so in routing table for R5 loopback its chose s0/1 point to point link
because of my static routes
ip route 150.1.4.0 255.255.255.0 Serial0/1
ip route 150.1.0.0 255.255.0.0 155.1.0.4
but after this step it forward the packet for switching proccess cef and in
cef the longest match for R5 loopback is via 155.1.0.4/32 s0/0
but here is another Q y it did,nt chose first ( before put no shut on
ser0/1) s0/0 frame relay link for R5 loopback becasue before putting no shut
my sh ip route 150.1.5.5 show me that perferd path for R5 loopback is s0/1
point to point link and tracroute also give me correct result but after
putting sh and no sh all this happend why ................?
On Mon, Feb 23, 2009 at 11:35 PM, Nadeem Ansari
<nadeem.ansari574@gmail.com>wrote:
> What show ip route shows on R4 at that time for R5 loopback interface
>
> Regards
> Nadeem
>
> On Tue, Feb 24, 2009 at 12:46 PM, <contactmarish@gmail.com> wrote:
>
>> Hi All,
>> I have facing one problem wih my static routing lab .In Internetworkexpert
>> version 5 there is one lab in static routing .plz find the lab Q below
>> down.
>>
>> 3.3 Longest Match Routing
>>
>> o 7 Configure R4 and R5 with routes to each otherb s Loopback0 interfaces
>> via
>> the point-to-point Serial interface between them.
>> o 7 Configure R4 and R5 to route the rest of the 150.X.0.0/16 network via
>> the
>> Frame Relay connection between them.
>> o 7 Ensure that traffic between R4 and R5b s Loopback0 networks transits
>> the
>> point-to-point link between them, but is rerouted out the Frame Relay
>> connection if the point-to-point link is down.
>>
>> R4 loopback is = 150.1.4.4 255.255.255.0
>> R5 loopback is = 150.1.5.5 255.255.255.0
>>
>> as mention in Q I configure R5 for R4 and R4 for R5
>>
>> R5:
>> ip route 150.1.4.0 255.255.255.0 Serial0/1 ( this interface is point to
>> point
>> link)
>> ip route 150.1.0.0 255.255.0.0 155.1.0.4 (this is a frame-relay link )
>>
>> R4:
>> ip route 150.1.5.0 255.255.255.0 Serial0/1 ( this interface is point to
>> point
>> link)
>> ip route 150.1.0.0 255.255.0.0 155.1.0.5 (this is a frame-relay link )
>>
>> now my configuration is work fine and when I put tracroute on R4 its show
>> me
>> that for reach R5 loopback it use R4 ponit to point serial link
>> (155.1.45.4
>> point to point link s0/1 IP on R4) decision on the longest match
>> and when I shut this point to point link my R4 chose next longest match
>> ip
>> which my frame-relay interfaec IP s0/0 ( 155.1.0.4 )
>> Ok
>> now through this step every thing is working fine BUT
>> when I put no shut on point to point serial interface ( as my knowledge
>> now
>> router again chose the serial point to point interface for reach R5
>> loopback
>> on longest match decision )the sh ip route 150.1.5.0
>> show me to rach R5 loopback R4 chose s0/1 (point to point interface) but
>> my
>> traceroute give me different result in tracroute router R4 chose
>> 150.1.0.5 to
>> reach R5 loopback. why ..................... ?
>> thanks.
>>
>>
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