Hi,
I have a very simple three router scenario, using 12.0(10) IOS on 1200
platform, and configured to run EIGRP.
RB
S0/ \ s1
(nw 1) bw=512 / \ bw=1024 (nw 2)
s1 / \ s1
RC ------- RA
bw=512
nw 3
All the three links are serial links connected by using a back-to-back X.21
cables.
Looking at the above diagram you would expect the following
RB
all traffic will be send over interface S1 to reach nw 3, and no load
balancing should take place.
RC
Two routes, to reach network nw 2, load balancing should take place, and two
routes should be seen in the routing tabel.
RA
All traffic should leave via interface S1 to reach the nw 1 and no load
balancing should take place.
Problem:
All the routers are showing that two paths exist to reach the destination
networks.
Please check the outputs:
-----------------------------------
ra#
interface Serial0
bandwidth 512
ip address 172.16.91.21 255.255.255.252
no fair-queue
!
interface Serial1
bandwidth 1024
ip address 172.16.91.25 255.255.255.252
!
router eigrp 1
passive-interface Ethernet0
network 172.16.0.0
distribute-list 1 out Serial0
distribute-list 1 out Serial1
auto-summary
no eigrp log-neighbor-changes
!
D 172.16.91.28/30 [90/6023936] via 172.16.91.26, Serial1
[90/6023936] via 172.16.91.22, Serial0
C 172.16.91.24/30 is directly connected, Serial1
ra#
------------------------------------
interface Serial0
bandwidth 512
ip address 172.16.91.30 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
no fair-queue
clockrate 38400
!
interface Serial1
bandwidth 1024
ip address 172.16.91.26 255.255.255.252
no ip directed-broadcast
clockrate 38400
!
router eigrp 1
passive-interface Ethernet0
network 172.16.0.0
distribute-list 1 out Serial0
distribute-list 1 out Serial1
rb#
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.15.0/24 is directly connected, Ethernet0
D 172.16.91.20/30 [90/6023936] via 172.16.91.25, Serial1
[90/6023936] via 172.16.91.29, Serial0
C 172.16.91.28/30 is directly connected, Serial0
C 172.16.91.24/30 is directly connected, Serial1
-------------------------------------
rc#
interface Serial0
bandwidth 512
ip address 172.16.91.22 255.255.255.252
no ip directed-broadcast
no ip mroute-cache
delay 2000
no fair-queue
clockrate 38400
!
interface Serial1
bandwidth 512
ip address 172.16.91.29 255.255.255.252
no ip directed-broadcast
!
router eigrp 1
passive-interface Ethernet0
network 172.16.0.0
distribute-list 1 out Serial0
distribute-list 1 out Serial1
!
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
C 172.16.14.0/24 is directly connected, Ethernet0
C 172.16.91.20/30 is directly connected, Serial0
C 172.16.91.28/30 is directly connected, Serial1
D 172.16.91.24/30 [90/6023936] via 172.16.91.21, Serial0
[90/6023936] via 172.16.91.30, Serial1
rc#
-------------------------------------
P.S. By changing the delay parameter on rb for inteface s0 (20000 -> 20001)
will for the traffic to go via interface s1.
Has anyone seen this behaviour before, is it normal for Eigrp to behave in
such a way ?
Note: All the Ethernet networks are 172.16.15.0, 172.16.14.0 and 172.16.90.0
all using a 24 bit mask, the distribute list was used to stop these updates
from entering the eigrp routing table.
The main focus here is to find out why the bandwidth command when used in
EIGRP is not effective. I hope I have not confussed anyone.
Thanks in Advance.
vp
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=38744&t=38744
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