02-01-2009 07:56 AM - edited 03-06-2019 03:48 AM
<p>Hi,</p>
<p>I have a question about eigrp routing:</p>
<p>the Vlan interfaces 12 ( Network 192.168.12.0/24) and VLAN Interface 16 (Network 192.168.16.0/24 ) are configured on the same switch. If I set the command "sh ip route" from a other switch in the network I see different hops count ( to the network 192.168.16.0 only 2 hops but the Network 192.168.12.0 a higher hop 7) . Please Help.</p>
<p>msfc1#sh ip route 192.168.12.0<br />
Routing entry for 192.168.12.0/24<br />
Known via "eigrp 1", distance 90, metric 4608, type internal<br />
Redistributing via eigrp 123<br />
Last update from 192.168.22.150 on Vlan4002, 00:35:48 ago<br />
Routing Descriptor Blocks:<br />
192.168.22.149, from 192.168.22.149, 00:35:48 ago, via Vlan4002<br />
Route metric is 4608, traffic share count is 1<br />
Total delay is 80 microseconds, minimum bandwidth is 1000000 Kbit<br />
Reliability 255/255, minimum MTU 1500 bytes<br />
Loading 1/255, Hops 7<br />
* 192.168.22.150, from 192.168.22.150, 00:35:48 ago, via Vlan4002<br />
Route metric is 4608, traffic share count is 1<br />
Total delay is 80 microseconds, minimum bandwidth is 1000000 Kbit<br />
Reliability 255/255, minimum MTU 1500 bytes<br />
Loading 1/255, Hops 7</p>
<p>msfc1#sh ip route 192.168.16.0<br />
Routing entry for 192.168.16.0/24<br />
Known via "eigrp 1", distance 90, metric 3328, type internal<br />
Redistributing via eigrp 123<br />
Last update from 192.168.22.137 on Vlan4001, 00:36:45 ago<br />
Routing Descriptor Blocks:<br />
192.168.22.138, from 192.168.22.138, 00:36:45 ago, via Vlan4001<br />
Route metric is 3328, traffic share count is 1<br />
Total delay is 30 microseconds, minimum bandwidth is 1000000 Kbit<br />
Reliability 255/255, minimum MTU 1500 bytes<br />
Loading 1/255, Hops 2<br />
* 192.168.22.137, from 192.168.22.137, 00:36:45 ago, via Vlan4001<br />
Route metric is 3328, traffic share count is 1<br />
Total delay is 30 microseconds, minimum bandwidth is 1000000 Kbit<br />
Reliability 255/255, minimum MTU 1500 bytes<br />
Loading 1/255, Hops 2</p>
<p>Thanks,</p>
<p>Nouri</p>
02-01-2009 09:27 AM
Not enough information but according to your output, 192.168.22.149 is where you learned that route. How is 192.168.22.149 learning the route to 192.168.12.0.
02-01-2009 11:37 AM
02-01-2009 11:35 PM
Hello Noureddine,
your architecture is a ring topology.
From your outputs in first post:
one subnet is learned via vlan 4001 that is the shortest path to core L3 switch.
the other subnet is instead learned via Vlan 4002 and makes all the trip around the ring towards the core switch thorough all the other L3 switches.
For this reason its metric is higher and also its hop count: if you look at the picture 7 hops are required going via vlan 4002 to reach core switch.
To understand why this happens you need to examine EIGRP configuration of core router and of router (L3 switch) between the device in blue and the core switch.
Check to see if there are distribute-list applied inside the
router eigrp process
on core or on device with next hop in vlan 4001:
or core is not advertising the prefix to device with next hop in vlan 4001 or it is the second device to have a filter.
Another possibility is the usage of
offset-list again check the configuration of eigrp processes on
core and device with next-hop in vlan 4001.
if you like you can post the configuration of eigrp processes on the three devices.
Hope to help
Giuseppe
02-02-2009 07:05 AM
Hi,
thank you for your help. I think I found the mistake
the Core switch don't annouce the network 192.168.12.0 as direct connected.
A nother switch core2 annouce the network 192.168.12.0 an direct connected
msfccore1#sh ip eigrp topology 192.168.12.0
IP-EIGRP topology entry for 192.168.12.0/24
State is Passive, Query origin flag is 1, 0 Successor(s), FD is 4294967295
Routing Descriptor Blocks:
msfccore2#sh ip eigrp topology 192.168.12.0
IP-EIGRP topology entry for 192.168.12.0/24
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 2816
Routing Descriptor Blocks:
0.0.0.0 (Vlan12), from Connected, Send flag is 0x0
Composite metric is (2816/0), Route is Internal
Vector metric:
Minimum bandwidth is 1000000 Kbit
Total delay is 10 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 0
02-02-2009 08:14 AM
Hello Noureddine,
yes there was a missing network command under router eigrp in mdfccore1.
Good news you have solved your issue
Best Regards
Giuseppe
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