OSPF between ASR1001-X and Cisco 3850

[amarula115]

Hi

I connected ASR1001-X to C3850 which runs OSPF already. C3850 successfuly works OSPF wise with 2 other C3850 over VPLS (broadcast type OSPF) and with directly connected SonicWall.

ASR1001-X Gi0/0/1 is connected directly to C3850 Gi1/0/1. Both are running "router ospf 1" Both of them are configured in area 0.

C3850 see other C3850 neighbors but doesnt see ASR1001 as an OSPF neighbor. I have not much experience with OSPF so possibly I am missing something in config or simply config is wrong.

Here are OSPF configs on both devices:

router ASR
interface GigabitEthernet0/0/1
description uplink to C3850 port Gi1/0/1
ip address 10.80.80.234 255.255.255.252
negotiation auto

interface Loopback0
ip address 10.80.84.245 255.255.255.255

router ospf 1
passive-interface default
no passive-interface GigabitEthernet0/0/1
network 10.80.80.232 0.0.0.3 area 0

network 10.80.84.248 0.0.0.0 area 0

ASR#sh ip ospf neighbor

(don't see any neighbors)

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

switch C3850
interface GigabitEthernet1/0/1
description Link to ASR 1001-X port Gi0/0/1
no switchport
ip address 10.80.80.233 255.255.255.252

interface Loopback0
ip address 10.80.84.240 255.255.255.255

router ospf 1
passive-interface default
no passive-interface GigabitEthernet1/0/1  --> to ASR
no passive-interface GigabitEthernet1/1/1  --> to another 3850 running ospf
no passive-interface GigabitEthernet2/0/1  --> to SonicWall running ospf
network 10.10.0.0 0.0.0.255 area 0
network 10.80.56.0 0.0.1.255 area 0
|
|
|
network 10.80.84.240 0.0.0.0 area 0
network 172.29.0.0 0.0.15.255 area 0
network 172.31.254.0 0.0.0.255 area 0

C3850#sh ip ospf neighbor

10.80.84.241 6 FULL/BDR 00:00:37 172.31.254.2 GigabitEthernet1/1/1 | another C3850 (area 0)
10.80.84.242 1 FULL/DROTHER 00:00:39 172.31.254.3 GigabitEthernet1/1/1 | another C3850 (area 0)
10.80.63.194 1 FULL/BDR 00:00:30 10.80.63.194 GigabitEthernet2/0/1 | SonicWall (area 0)

as you shown I can't see ASr1001 as a neighbor.
Any idea what I am doing wrong or what is missing in the config?

Any help appreciated

Thank you

[Flavio Miranda]

Hello,

What "debug ip ospf hello" says on ASR ?

[Julio E. Moisa · Accepted solution]

Hi

Please correct me but I dont see this line under the OSPF on the 3850

router ospf 1

network 10.80.80.232 0.0.0.3 area 0

[amarula115]

Thank you a lot for help

[Julio E. Moisa · Accepted solution]

You are welcome my friend.

Have a great day!

:-)

[paul driver]

Hello

I would check the prefixes your advertising:

The ASR isnt advertsing the correct loopback address
network 10.80.84.248 0.0.0.0 area 0 <--should be network 10.80.84.245 0.0.0.0 area 0

3850 isnt advertisning its gig1/1/1 network<-- should be 10.80.80.232 0.0.0.3 area 0

res
Paul

[amarula115]

Thank you