09-24-2012 08:24 AM - edited 03-07-2019 09:04 AM
Hello,
I have a hub and spoke WAN that conisits of one core location with with a 6500 and nine other buildings using 4006 Catalyst that conenct back to the core via dual gig fiber. We are using EIGRP at each location as well as the core. I was tesing something at one of our buildings decided to hang a 3750 off the 4006 and enable the same eigrp process on the 3750 that is enabled on the 4006 and 6500 (EIGRP 1).
1. All the routes that the 6500 knows about are advertised out to each of the nine locations.
2. The 4006's are all advertising thier directly conencted routes to the 6500.
Onto the location I was testing at:
The 4006 where I was testing at has four vlan interfaces enabled and they are in an UP/UP state. The ip routes from the 4006's directly conencted vlan interfaces propogate to the 6500 at our core location and the 6500 sucsefully propgates these learned routes to all the other 4006's.
This past Friday I configured a 3750x with two /22 vlan interfces and one physical gi port with an IP address and also configured on Ethernet port on the 4006 with an IP address in the same network block as the 3750x gi interface (a /30 netowrk block). I saw both interfaces come up and EIGRP sucesfully established a neighbor adjecency between the 3750x and the 4006.
I noticed that the 3750 advertised out all of it's directly conencted routes to the 4006 and the 4006 advertised it's directly conencted routes to the 3750. However, the 4006 did not advertise any of the routes it had learned from the 3750x to the 6500 and nor did the 4006 advertise any of the routes it had learned from the 6500 to the 4006. My suspicion is that the "eigrp stub connected summary" statement is enabled on both the 4006 and 3750 thus prevenintg them form advertising out any routes other than thier directly conencted routes. Can any of you verify that I'm either correct or inccorect about this?
here are the eigrp statemnets from the 6500 and 4006:
6500:
router eigrp 1
redistribute static
network 10.0.0.0
network 172.16.0.0
network 172.17.0.0
network 172.18.30.0 0.0.0.255
network 172.18.100.0 0.0.0.255
network 172.20.4.0 0.0.3.255
network 172.20.8.0 0.0.3.255
no auto-summary
4006:
router eigrp 1
network 10.0.0.0
network 172.16.0.0
network 172.20.60.0 0.0.3.255
network 172.20.64.0 0.0.3.255
no auto-summary
eigrp stub connected summary
09-24-2012 08:38 AM
Hello Javier,
your understanding is correct:
on C4006 the command eigrp stub connected stub summary makes the C4006 an EIGRP stub router and as result of this it is not able to propagate routes learned from C6500 to the C3750.
Depending on the IOS feature set your C4006 may have full EIGRP support or only stub EIGRP neighbor support.
If the command can be removed you should see the routes coming from C6500 on the C3750
Hope to help
Giuseppe
09-24-2012 09:20 AM
Thank you Giuseppe, I figured I was correct but it's always good to have fellow Networker's confirm things for me. Unfortunetly, the IOS level on the 4006 will not allow me to remove the eigrp stub connected summary statement. Of course I cna use other options wihtin the stub statement but then the 4006 will not advertise out it's conencted routes which is a bigger issue.
Thanks again,
Javier
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