Friday, October 28, 2011

Redistribution Mock Lab - The Crazy Stuff

Last year while I was preparing for my R&S Lab, I felt I was not well prepared for complex redistribution scenarios. I took a look at Vol-1 workbooks outline from IP Expert and Internetwork Expert but none of them seems to cover Redistribution as part of Technology labs. So I thought to create some ugly redistribution lab my self.


So let me quickly share the physical & logical topology here with you guys along with initials.

Requirement is simple - to perform mutual redistribution at all redistribution points without creating a routing loop. 




 



R1#sh ver | i IOS
Cisco IOS Software, 3600 Software (C3640-JS-M), Version 12.4(17), RELEASE SOFTWARE (fc1)





<<< R1 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R1
!
int lo0
ip add 1.1.1.1 255.255.255.0
ip ospf network point-to-p
exit
!
int f1/0
ip add 15.15.15.1 255.255.255.0
no sh
exit
!
int s0/0
ip add 10.10.10.1 255.255.255.0
en f
no frame inv
frame map ip 10.10.10.2 102 b
frame map ip 10.10.10.3 103 b
frame map ip 10.10.10.4 104 b
frame map ip 10.10.10.1 102
ip ospf network point-to-m
no sh
exit
!
router ospf 1
router-id 111.111.111.111
net 1.1.1.1 0.0.0.0 a 0
net 15.15.15.1 0.0.0.0 a 0
net 10.10.10.1 0.0.0.0 a 0
end
!
!
wr mem
---------------------------

<<< R2 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R2
!
int lo0
ip add 2.2.2.2 255.255.255.0
ip ospf network point-to-p
exit
!
int s0/0
ip add 10.10.10.2 255.255.255.0
en f
no frame inv
frame map ip 10.10.10.1 201 b
frame map ip 10.10.10.2 201
ip ospf network point-to-m
no sh
exit
!
router ospf 1
router-id 222.222.222.222
net 2.2.2.2 0.0.0.0 a 0
net 10.10.10.2 0.0.0.0 a 0
exit
!
int lo1
ip add 12.12.12.12 255.255.255.0
exit
!
int s0/1
ip add 24.24.24.2 255.255.255.0
no sh
exit
!
router eigrp 100
no au
net 12.12.12.12 0.0.0.0
net 24.24.24.2 0.0.0.0
end
!
!
wr mem
------------------------------

<<< R3 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R3
!
int lo0
ip add 3.3.3.3 255.255.255.0
ip ospf network point-to-p
exit
!
int s0/0
ip add 10.10.10.3 255.255.255.0
en f
no frame inv
frame map ip 10.10.10.1 301 b
frame map ip 10.10.10.3 301
ip ospf network point-to-m
no sh
exit
!
int s0/1
ip add 34.34.34.3 255.255.255.0
no sh
exit
!
int lo1
ip add 13.13.13.13 255.255.255.0
exit
!
router ospf 1
router-id 333.333.333.333
net 3.3.3.3 0.0.0.0 a 0
net 10.10.10.3 0.0.0.0 a 0
exit
!
router eigrp 100
no au
net 13.13.13.13 0.0.0.0
net 34.34.34.3 0.0.0.0
exit
!
int lo2
ip add 133.133.133.133 255.255.255.0
exit
!
int f1/0
ip add 63.63.63.3 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 133.133.0.0
net 63.0.0.0
end
!
!
wr mem
------------------------------
--

<<< R4 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R4
!
int lo0
ip add 4.4.4.4 255.255.255.0
ip ospf network point-to-p
exit
!
int s0/0
ip add 10.10.10.4 255.255.255.0
en f
no frame inv
frame map ip 10.10.10.1 401 b
frame map ip 10.10.10.4 401
ip ospf network point-to-m
no sh
exit
!
router ospf 1
router-id 444.444.444.444
net 4.4.4.4 0.0.0.0 a 0
net 10.10.10.4 0.0.0.0 a 0
exit
!
int lo1
ip add 14.14.14.14 255.255.255.0
exit
!
int s0/1
ip add 24.24.24.4 255.255.255.0
no sh
exit
!
int s0/2
ip add 34.34.34.4 255.255.255.0
no sh
exit
!
router eigrp 100
no au
net 14.14.14.14 0.0.0.0
net 24.24.24.4 0.0.0.0
net 34.34.34.4 0.0.0.0
exit
!
int f1/0
ip add 100.100.100.4 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 100.0.0.0
end
!
!
wr mem
------------------------------
-

<<< R5 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R5
!
int lo0
ip add 5.5.5.5 255.255.255.0
ip ospf net point-to-p
exit
!
int f0/0
ip add 15.15.15.5 255.255.255.0
no sh
exit
!
router ospf 1
router-id 555.555.555.555
net 5.5.5.5 0.0.0.0 a 0
net 15.15.15.5 0.0.0.0 a 0
exit
!
int lo1
ip add 115.115.115.115 255.255.255.0
exit
!
int f1/0
ip add 56.56.56.5 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 115.115.0.0
net 56.0.0.0
end
!
!
wr mem
---------------------------

<<< R6 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R6
!
int lo0
ip add 6.6.6.6 255.255.255.0
exit
!
int f1/0
ip add 63.63.63.6 255.255.255.0
no sh
exit
!
int f0/0
ip add 56.56.56.6 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 6.0.0.0
net 63.0.0.0
net 56.0.0.0
end
!
!
wr mem
---------------------------------

<<< R7 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R7
!
int lo0
ip add 7.7.7.7 255.255.255.0
exit
!
int f0/0
ip add 100.100.100.7 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 7.0.0.0
net 100.0.0.0
end
!
!
wr mem

---------------------------------------


<<< R8 >>>

!
en
!
debug ip ro
!
conf t
!
no ip domain-lo
!
ho R8
!
int lo0
ip add 8.8.8.8 255.255.255.0
exit
!
int f0/0
ip add 100.100.100.8 255.255.255.0
no sh
exit
!
router rip
v 2
no au
net 8.0.0.0
net 100.0.0.0
end
!
!
wr mem
I would like to mention here that I am not looking for optimal routing here after redistribution, R4 has 3 routing protocols running, so make sure all three have mutual redistribution.
All you need to know about redistribution is right here
Deepak Arora
Evil CCIE 
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Tuesday, October 25, 2011

My Updated Linkedin Profile

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Tuesday, October 11, 2011

OSPF Loopback Advertisements With Proper Mask - The Tricky Part

There is always a talk going on about among CCNP/CCIP/CCIE candidates that why a loopback interface is always treated as Stub Host into OSPF and Advertised as /32 route even the actual mask for the interface was configured differently.

Actually It's based on RFC standard 2328 for OSPF ver2. Here are ref details :

RFC - 2328  http://www.ietf.org/rfc/rfc2328.txt
Protocol - OSPF Ver 2
Section - 9.1
Page - 66
Tag - Interface States > Loopback

Now interestingly Cisco Documentation provides only a one work-around to this by putting command - ip ospf network point-to-point under the loopback interface itself.

But are there any other ways ? ....

What if our Evil CCIE Lab ask to advertise Loopback interfaces with correct mask and we are not allowed use the command mentioned above :-)

Actually there are three ways to do it, lets explore them one by one.

















HTH...
Deepak Arora
Evil CCIE
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