Redistribution between IS-IS, EIGRP & OSPF

Sam Soh · Guest

Termserver---R1---R3
\--R7--/
R1, R7, and R3 connect altogether in ethernet interfaces.
Termserver connect to R1 thru serial to R1
Termserver connect to R7 thru serial to R7

Termserver, R1 and R7 are running IS-IS.
R1, R7 and R3 are running EIGRP.
R3 is running OSPF and attached to the OSPF network.
All the redistribution looks just fine, EXCEPT the serial interfaces
between Termserver, R1, and R7 (which is 135.3.117.X 255.255.255.240
network) cannot be seen in routing tables of R3 and the continuing
OSPF network.

TermServer#
interface Loopback11
ip address 135.3.251.11 255.255.255.192
ip router isis
!
interface Serial0
ip address 135.3.117.11 255.255.255.240 (isis network connect to
R1&R7)
ip router isis
clockrate 64000
!
interface Serial1
ip address 135.3.117.12 255.255.255.240 (isis network connect to
R1&R7)
ip router isis
clockrate 64000
!
router isis
net 49.0001.0000.0000.000a.00

R1#
interface Loopback10
ip address 135.3.1.1 255.255.255.0
!
interface Loopback11
ip address 135.3.11.1 255.255.255.192
ip router isis
!
interface Ethernet0
ip address 135.3.137.1 255.255.255.0 (EIGRP network connect to R7&R3)
!
interface Serial0
ip address 135.3.117.1 255.255.255.240 (isis network connect to
Termserver&R7)
ip router isis
!
router eigrp 1
redistribute isis level-1-2 metric 1 100 255 150 1500
network 135.3.1.0 0.0.0.255
network 135.3.137.0 0.0.0.255
no auto-summary
!
router isis
net 49.0001.0000.0000.000b.00
redistribute eigrp 1 metric 20

R7#
interface Loopback10
ip address 135.3.7.7 255.255.255.0
!
interface Loopback77
ip address 135.3.77.7 255.255.255.192
ip router isis
!
interface Ethernet0
ip address 135.3.137.7 255.255.255.0 (EIGRP network connect to R1&R3)
!
interface Serial0
ip address 135.3.117.7 255.255.255.240 (isis network connect to R1&
Termserver)
ip router isis
!
router eigrp 1
redistribute isis level-1-2 metric 1 100 255 150 1500
network 135.3.7.0 0.0.0.255
network 135.3.137.0 0.0.0.255
no auto-summary
!
router isis
net 49.0001.0000.0000.000c.00
redistribute eigrp 1 metric 20

R3#
interface Loopback10
ip address 135.3.3.3 255.255.255.0
!
interface Loopback20
ip address 135.3.33.33 255.255.255.0
!
interface Ethernet0
ip address 135.3.137.3 255.255.255.0 (EIGRP network connect to R7&R3)
!
router eigrp 1
redistribute ospf 1
network 135.3.33.0 0.0.0.255
network 135.3.137.0 0.0.0.255
default-metric 10000 100 255 1 1500
no auto-summary
!
router ospf 1
router-id 135.3.3.3
log-adjacency-changes
redistribute eigrp 1 subnets
network 135.3.3.0 0.0.0.255 area 0
network 135.3.34.0 0.0.0.7 area 0
network 135.3.53.0 0.0.0.255 area 5
neighbor 135.3.53.5 priority 1

Network 135.3.117.X can not be seen in R3. Help, please anybody.

Best Regards,
Sam

The Real Slim Shady · Guest

On R1 and R7, you need to do a redistribute connected under the EIGRP
process. Networks that are part of the ISIS process on directly connected
interfaces on a router DO NOT get redistributed into the receiving protocol
(EIGRP in your case) - you have to do a redistribute connected to get them
there. This is NOT the case with any other IGP - it is unique to ISIS on
cisco boxes.

This is the reason that R3 cannot see the two serial interface routes.

This is a common trap in the real world and on certain cisco "practical"
exams!!

"Sam Soh" <indotears@yahoo.com> wrote in message
news:69c0a134.0308111838.27babc54@posting.google.com...

Sam Soh · Guest

WOW....Thanks alot, Real Slim Shady.
I really appreciate the answer. For a whole day, I thought my weird
problem won't be solved. Thank you alot.

Best Regards,
Sam

"The Real Slim Shady" <tinker-too@yahoo.com> wrote in message news:<bhaiei$105uga$1@ID-179018.news.uni-berlin.de>...

slarmas · Guest

Wow, somone actually running ISIS? Talk about shock and awe :)

"Sam Soh" <indotears@yahoo.com> wrote in message
news:69c0a134.0308111838.27babc54@posting.google.com...

Ivan Ostres · Guest

"slarmas" <slarmas@speakeasy.net> wrote in message
news:MaCdnY943PBNpKaiRVn-ig@speakeasy.net...

The Real Slim Shady · Guest

You are welcome. Bear in mind that ISIS only works in broadcast networks
and point to point links. It does not work on multipoint or NBMA networks.
I understand Cisco are addressing this. However, in the meantime this has
design and IP address implications in networks that currently run OSPF and
are migrating to ISIS.

Slim

"Sam Soh" <indotears@yahoo.com> wrote in message
news:69c0a134.0308121808.5d16780f@posting.google.com...

The Real Slim Shady · Guest

ISIS is a very powerful protocol that can scale to many thousands of nodes.
It does not employ the area 0 principle in the way that OSPF does so you do
not have to connect every area to area 0 - only to the set of contiguous L2
routers. The ISIS book by Abe Martey is a must read if you are into this
protocol.

Slim

"slarmas" <slarmas@speakeasy.net> wrote in message
news:MaCdnY943PBNpKaiRVn-ig@speakeasy.net...

Sam Soh · Guest

Slim,
I really do appreciate your commentary and help solving my problem. In
the mean time I have been reading the RFC about this powerful ISIS. I
sure will buy the book. Thanks Slim.

Best Regards,
Sam Soh

p.s.
May I have your email, Slim?

"The Real Slim Shady" <tinker-too@yahoo.com> wrote in message news:<bhfvu0$b2p1$1@ID-179018.news.uni-berlin.de>...